Chemistry Quiz

Question

For the half cell

At

, electrode potential is

Possible Answers

Selected	Possible Answer
	1.42 V
	1.36 V
	1.2V
	1.3V

Question

$Cu^{+} +e \rightarrow Cu$ , $E^{0} = X_1 Volt$

$Cu^2 + 2e \rightarrow Cu, E^0 = X_2 Volt$

$For \operatorname{Cu^{+2}} + e\rightarrow Cu^{+} E^0$

will be

Possible Answers

Selected	Possible Answer

Question

A hydrogen electrode placed in a buffer solution of CH_3 COONa and acetic acid in the ratio’s x: y and y : x has electrode potential values E_1 volt and E_2 volts respectively at 25^0 C . The pKa values of acetic acid is ( E_1 and E_2 are oxidation potential)

Possible Answers

Selected	Possible Answer
	$\cfrac{E_1 - E_2}{0.118}$
	$\cfrac{E_1 + E_2}{0.118}$
	$-\cfrac{E_1 + E_2}{0.118}$
	$\cfrac{E_2 - E_1}{0.118}$

Question

Calculate the useful work of the reaction

$Ag(s) + \frac{1}{2}Cl_2 (g) \rightarrow AgCl (s)$

given that $E^0 Cl_2/Cl^{-} = + 1.36 V$ ;

$E^0 AgCl, Ag, Cl^{-} = +0.220 V$

$if P_{Cl_2}= 1 \And T = 298 K$

Possible Answers

Selected	Possible Answer
	$55 \operatorname{kJ} mol^{-1}$
	$110 \operatorname{kJ} mol^{-1}$
	$100 \operatorname{kJ} mol^{-1}$
	$220 \operatorname{kJ} mol^{-1}$

Question

$\Delta G = \Delta H - T\Delta S \And \Delta G = \Delta H + T$ $\Big [ \cfrac{d(\Delta G)}{dT} \Big ]_p$ then $\Big ( \cfrac{dE_{cell}}{dT}\Big )$ is

Possible Answers

Selected	Possible Answer
	$\cfrac{\Delta E}{\Delta S}$
	$-n FE_{cell}$
	$\cfrac{\Delta S}{n F}$
	$+nEF_{cell}$

Question

A cell with two electrodes, one of grey tin and the other white tin, both dipping in solution of (NH_4)_2SnCl_6 showed zero e.m.f at 18^0 C What conclusion may be drawn form this

Possible Answers

Selected	Possible Answer
	The e.m.f developed at the electrode solutions phase boundary concels the normal e.m.f
	electrode surface develops a protective layer and the cell develops a very large internal resistance
	Grey tin being non- metallic ceases to provide a reversible electro reaction
	The free energy change of the cell becomes zero .

Question

Which graph correctly correlates $E_{Cell}$ as a function of concentration for the cell (for different values of M and M’)

$Zn (s) + Cu^{2+} (M) \rightarrow Zn^{2+} (M') + Cu(s). E_{cell} ^{0}=1.10V$

$X- axis : \log_{10}$ $\cfrac{[Zn^{2+}]}{[Cu^{2+}]}$ $.Y- axis: E_{cell}$

Possible Answers

Selected	Possible Answer
	b
	a
	c
	d

Question

Two liquids A and B have vapour pressure in the ratio $P_{A} ^{0} : P_{B} ^{0} =2 :3$ at a certain temperature Assume A and B form an ideal solution and the ratio of mole fractions of A to B in the vapour phase is 1:3 , then the mole fraction of A in the solution at the same temperature

Possible Answers

Selected	Possible Answer
	$\frac{3}{4}$
	$\cfrac{1}{3}$
	$\frac{2}{3}$
	$\frac{1}{4}$

Question

A certain solution of benzoic acid and in benzene has a freezing point depression of $2.4^{0} (Kf = 5.12^{0} mol ^{-1} kg)$ and boiling point elevation of $2.5^0 (K_b = 2.53^{0} mol^{-1} kg )$ Thus select the correct statement.

Statement I -:there is dimer formation when undergoing freezing

Statement II -there is no change when undergoing boiling

Statement III: -:reverse of I and II freezing formation in freezing and boiling state

Statement IV: -:dimer formation in freezing and boiling state

Possible Answers

Selected	Possible Answer
	only I
	II, III
	I, II
	III, IV

Question

Consider the reactions

$C(s) +2H_2(g) \rightarrow CH_4 (g)$ , $\Delta H =- x K cal$

$C(g) +4H(g) \rightarrow CH_4(g),$ $\Delta H =-x_1 \operatorname{K} cal$

$CH_4 (g) \rightarrow CH_3(g) + H(g)$ $\Delta H = + y$ K cal

The bond energy of C-H

bonds is

Possible Answers

Selected	Possible Answer
	$\cfrac{x}{4}K \operatorname{cal} mol^{-1}$
	$YK \operatorname cal$ $mo1^{-1}$
	$X_1 K \operatorname{cal} mol^{-1}$
	$\cfrac{x_1}{4}K\operatorname{cal} mol^{-1}$

Question

f the internal energy of an ideal gas decreases by the same amount as the work done by the system, the process is

Possible Answers

Selected	Possible Answer
	isothermal
	isolated
	adiabatic
	cyclic

Question

40 Joules of heat has been given to a system and the work done by the system is equal to –8 joules . Evaluate the increase in internal energy by the system

Possible Answers

Selected	Possible Answer
	8J
	48J
	None
	56 J

Question

For a diatomic molecule AB, the electronegativity difference between A and $B = 0.208 \sqrt{\Delta}$ where $\Delta$ = [Bond energy of AB – geometric mean of the bond energies of A_2

and

] The electronegativities of fluorine and chlorine are 4.0 and 3.0 respectively and the bond energies of $F-F ; 38 K cal\; mol^{-1}$ and $C - C ; 58 K cal\; mol^{-1}$ the bond energy of Cl - F

is

Possible Answers

Selected	Possible Answer
	$\approx 71 K cal/ mol$
	$\approx 61 K cal/ mol$
	$\approx 75 K cal/ mol$
	$\approx 48 K cal / mol$

Question

In thermodynamics a process is called reversible when

Possible Answers

Selected	Possible Answer
	The system changes into the surroundings spontaneously.
	Surrounding and system change into each other
	The surroundings are always is equilibrium with the system
	here is no boundary between system and surroundings

Question

Latent heat of vaporization of water is $540\;cal\; g^{-1}$ . The entropy change during the evaporation of 1 mole of water at 100^0C is

Possible Answers

Selected	Possible Answer
	$5.4 cal K^{-1} mol^{-1}$
	$20 cal K^{-1} mol^{-1}$
	$26.06\;cal\;K -1 mol^{-}1$
	$25 cal K^{-1} mol^{-1}$

Question

Entropy of universe, in the case of adiabatic expansion of a gas is

Possible Answers

Selected	Possible Answer
	$\Delta_{Suniv} = 0$
	$\Delta_{Suniv} > 0$
	$\Delta_{Suniv} < 0$
	$\Delta_{Suniv} \underline{>} 0$

Question

Which of the following statement is not true

Possible Answers

Selected	Possible Answer
	NaCl has 6:6 co- ordination while CsCl has 8:8 co- ordinations
	NaCl structure on heating transforms to CsCl structure
	In structure each F- ion is coordinated by four $Ca^{+2}$ ions and each $Ca^{+2}$ ion is co- ordinated by eight F- ions
	In , each oxide ion is co- ordinates by eight ions and each ion by four oxide ions

Question

In a face – centered arrangement of A and B atoms. Where A atoms are at the corners of the unit cell and B atoms at the face centres . One of the A atoms is missing from one corner in each unit cell. The simplest formula of the compound will be

Possible Answers

Selected	Possible Answer

	$A_8 B_{15}$
	$A_{7}B_{24}$
	$A_7B_{12}$

Question

In a solid oxide ions are arranged in ccp. cations A occupy $1/6^{th}$ of the tetrahedral voids and cations B occupy $1/3^{rd}$ of the octahedral voids. The formula of the compounds is

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Selected	Possible Answer

Question

Which plot is the adsorption isobar for chemisorption where x is the amount of gas adsorbed on mass M ( at constant pressure ) at temperature T

Possible Answers

Selected	Possible Answer
	a
	b
	c
	d

Question

The oxidation of oxalic acid by acidified KMnO_4 becomes fast as the reaction progresses due to

Possible Answers

Selected	Possible Answer
	presence of
	auto catalysis by $Mn^{+2}$
	presence of $MnO_4 ^{-}$
	presence of $SO_4 ^{-2}$

Question

Which is not the property of the hydrophillic sols

Possible Answers

Selected	Possible Answer
	the charge of the particle depends upon pH values of the dispersion medium.
	coagulation is reversible
	high concentration of dispersed phase can be easily attained
	viscosity and surface tension are about the same as of dispersed medium.

Question

Order of decreasing polarity of the bonds

SbH_3, AsH_3, PH_3, NH_3

Possible Answers

Selected	Possible Answer

Question

Which of the following statement is correct about POCl_3

It has the shape of an irregular tetrahedron with the P atom located centrally

the

angle is $103.5^{0}$

Possible Answers

Selected	Possible Answer
	A
	B
	Both correct
	None of correct

Question

Which graph represents the variation of photon momentum ‘P’ with wavelength $\lambda$

Possible Answers

Selected	Possible Answer
	d
	b
	c
	a

Question

A viral preperation was inactivated in a chemical bath. The inactivation process was found to be first order in virus concentration, and at the beginning of the experiment 2.0% of the virus has found to be inactivated per minute. Hence rate constant for the inactivated process is

Possible Answers

Selected	Possible Answer
	$None\;\operatorname{is}\quad correct$

	$2.0 * 10^{-2} min^{-1}$
	$3.37 *10^{-4} s^{-1}$

Question

It is easier to liquefy oxygen than hydrogen because :

Possible Answers

Selected	Possible Answer
	Oxygen has a higher critical temperature and lower inversion temperature than hydrogen
	the critical temperature and inversion temperature of oxygen is very low.
	Oxygen has a lower critical temperature and higher inversion temperature , than hydrogen
	oxygen has a higher critical temperature and a higher inversion temperature than hydrogen

Question

The correct order of acidic strength is

Possible Answers

Selected	Possible Answer
	$Cl_2O_7 > SO_3 > P_4O_{10}$

Question

An ideal gas undergoes isothermal expansion followed by heat removal at constant volume and then by heat removal at constant pressure to the initial volume. The correct description of these steps is indicated by

Possible Answers

Selected	Possible Answer
	c
	d
	a
	b

Question

Which one of the following graphs correctly represents the change in electrical conductivity as copper
(II) carbonate is gradually added to dilute sulphuric acid

Possible Answers

Selected	Possible Answer
	d
	b
	a
	c

Question

A chemical reaction $A \rightarrow C$ proceeds as $A \rightarrow B \rightarrow C$ . The progress of reactions as :represented as which of following step is fast

Possible Answers

Selected	Possible Answer
	$B \rightarrow C$
	$A \rightarrow C$

	$A \rightarrow B$

Question

In general , the configuration of lanthanones is $(n -2)f^{1-14} (n-1) s^2p^6$ $d^{1 \operatorname{or} 0}$ ns^2 . it is observed that with increase in atomic number of lanthanides, there is decrease of ionic radii from $La ( 1.22 \overset{0}{A})$ to $Lu ( 0.99 \overset{0}{A})$ . The reason for decrease in ionic radii is increase in

Possible Answers

Selected	Possible Answer
	Atomic volume
	Electronegtivity
	Nuclear attraction for valence electrons leading to inwards shrinking of shells
	Valency electron

Question

The sudden jump between of second and third ionisation energies of an atom would be associated with the electronic configuration

Possible Answers

Selected	Possible Answer

Question

The complex in which the number of unpaired electrons is zero

Possible Answers

Selected	Possible Answer

	$CoF_{6} ^{-3}$
	$TiF_{6} ^{-3}$
	None of these

Question

The atomic number of potassium is 19 and that of maganese is 25. Although [ $MnO_{4} ^{-}$ ] has a dark violet colour, that K^+ is colourless. This is due to fact that

Possible Answers

Selected	Possible Answer
	Mn is a transition element , while K is not
	$[MnO_4 ^{-}]$ is negatively charged species while has a positive charge
	The Mn is a high positive oxidation state and allows charge transfer transition
	The effective atomic number of in $[MnO_4 ^{-}]$ is 26 while for the effective atomic no. is 18

Question

Mercury is the only metal which is liquid at 0^0C . This is due to

Possible Answers

Selected	Possible Answer
	Low ionisation potential
	High atomic weight
	High vapour pressure
	Very high ionisation energy and weak metallic bond

Question

Electrolyte reduction of alumina to aluminum by Hall- Heroult process is carried out

Possible Answers

Selected	Possible Answer
	In the presence of NaCl
	In the presence of fluorite
	In the presence of cryolite which forms a melt with lower melting point
	In the presence of cryolite which forms a melt with higher melting point

Question

For making H_2O_2 in the laboratory

Possible Answers

Selected	Possible Answer
	is added to an acidified solution of
	is added to boiling water
	is added to dilute cold
	is added to bubbling through cold Water

Question

Which of the following statement is not correct

Possible Answers

Selected	Possible Answer
	Nascent hydrogen can never be isolated but atomic hydrogen can be isolated
	Atomic hydrogen reduces to and to
	None
	The reducing power of nascent hydrogen is more than that of atomic hydrogen

Question

The ortho and para hydrogen have

Possible Answers

Selected	Possible Answer
	Different physical properties but same chemical properties
	Same physical properties but differnt chemical properties
	Different physical and chemical properties
	Same physical properties and chemical properties

Question

The hair dyes available in the market generally contain two bottles, one containing the dye and the other hydrogen peroxide. Before applying the dye, the two solution are mixed . The hydrogen peroxide

Possible Answers

Selected	Possible Answer
	Acidifies the solution of the dye
	Reduces the dye to give the desired colour
	Oxidizes the dye to give the desired colour
	is added to dilute the solution of the dye

Question

The deep colour produced when iodine is dissolved in a solution of potassium iodide is caused by the presence of

Possible Answers

Selected	Possible Answer
	$I_3 ^{-}$

	$I_2 ^{-}$
	$I^{-}$

Question

The hydride ion $H^{-}$ is stronger base than its hydroxide, $OH^{-}$ which of the following reaction will occur if sodium hydride is dissolved in water

Possible Answers

Selected	Possible Answer
	None of these
	$H^{-}(aq) +H_2O (l) \rightarrow OH^{-} + H_2$
	$H^{-} + H_2O \rightarrow \operatorname{No} reaction$
	$H^{-}(aq) +H_2O \rightarrow H_2O$

Question

does not resemble other alkali metals in following properties

Possible Answers

Selected	Possible Answer
	All
	is stable
	is predominantly covalent
	decomposes into oxides while other alkali carbonates are thermally stable

Question

The correct order of solubility of fluorides of alkaline earth metals is

Possible Answers

Selected	Possible Answer
	All

Question

Consider the following points and select wrong statement

Possible Answers

Selected	Possible Answer
	does not form peroxide in II A group element
	is the strongest reducing agent in IA group element in air
	In alkali metals , , and lithium has the minimum value of M.P
	The density of potassium is less than sodium

Question

Least mobile ion is

Possible Answers

Selected	Possible Answer
	$[Mg(H_2O)_n]^{+2}$

	$[Be(H_2O)_n]^{+2}$
	$[Na(H_2O)_n]^{+}$

Question

Which of the following is wrong

Possible Answers

Selected	Possible Answer
	has a much higher M.P and insoluble in organic solvents
	The solubility’s of sulphates and carbonates decreases with increases in atomic number of the alkaline earth metals
	The complex formation ability decreases from Be to Ba
	Reducing character of alkaline earth metals increases from Be to Ba

Question

Yellow – coloured solution of FeCl_3 changes to light green colour when

A:- H_2S gas is passed

B:- SnCl_2 is added

C:- NH_4CNS is added

D:- K_3 [Fe (CN)_6) ] is added

Possible Answers

Selected	Possible Answer
	CD
	A
	AB
	C

Question

is formed when

A:- Moist Fe reacts with

B:- $Sn^{+2}$ reacts with conc. NHO_3

in presence of HCl

C:- Cold dil. NHO_3

reacts with

and

D: -

is heated

Possible Answers

Selected	Possible Answer
	AC
	AB
	CD
	ABCD

Question

contains

Possible Answers

Selected	Possible Answer
	3 planar triangular and 2 tetrahedral units
	5 planer triangular units only
	2 planar triangular and 2 tetrahedral units
	no such units

Question

Which of the following statements is / are correct

A:- CIO_2 and Cl_2O are used as bleaching agents paper pulp and textiles.

B:- $CIO^{-}$ salts are used as sterilising agents

C:- CIO^- disproportionates in alkaline medium

D:- $BrO_3 ^{-}$ oxdised to Br_2 by $Br^{-}$ in acidic medium

Possible Answers

Selected	Possible Answer
	ABC
	AB
	BCD
	AD

Question

Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen because aerial nitrogen contains

Possible Answers

Selected	Possible Answer


	Greater amount of molecules derived from isotope
	Some molecules analogous to

Question

A gas does not turn lime –water milky , supports the combustion of burning magnesium. it has no smell and is colourless. it extinguishes a glowing splint but under some circumstnces reacts with oxygen and hydrogen it is not poisonous . The gas is likely to be

Possible Answers

Selected	Possible Answer
	Nitrogen
	Carbon dioxide
	Helium
	Water vapour

Question

Which of the following statements is / are correct

A:- Compounds of S, Se and Te with oxygen are generally tetravelent, but fluorine brings out of maximum oxidation state of +6

B:- The higher oxidation states become less stable as we go down the group

C:- The +4 state shows both oxidizing and reducing properties , but in +6 state the compounds are only oxidizing

D:- These compounds are typically volatile

Possible Answers

Selected	Possible Answer
	ABC
	DA
	BCD
	ABCD

Question

and

can not co-exist in a solution due to

Possible Answers

Selected	Possible Answer
	Redox change
	Solubility product
	Common ion effect
	All

Question

When H_2O_2 is added to an acidified solution of K_2 Cr_2O_7

Possible Answers

Selected	Possible Answer
	Solution turns yellow due to formations of
	A deep blue – violet coloured compounds is formed
	Solution gives green ppt. of
	Solution turns green due to formations of

Question

Which of the following statements is correct

Possible Answers

Selected	Possible Answer
	In acidic solution ion dimerises to from chromate in ,
	All
	The chromate ion, $CrO_4 ^{-2}$ is a common anion in neutral or alkaline solution
	Dichromate ion is a very strong oxidising agent and get reduce to $Cr^{+3}$ ion

Question

Select the correct statement

Possible Answers

Selected	Possible Answer
	$[Co(NH_3)_6]^{+3}$ is paramagnetic while $[Co F_6]^{3-}$ is diamagnetic
	IUPAC name for is tetrammine chloronitrocobalt (III) chloride
	possensses square planner geometry while $[Nl (CN)_4 ^{2-}$ is tetrahedral
	has square planar shape

Question

A square planar complex represented will show

Possible Answers

Selected	Possible Answer
	Geometrical isomers
	Linkage isomerism
	No isomerism
	Optical isomerism

Question

Which of the following are expected to be paramagnetic?

Possible Answers

Selected	Possible Answer
	$[Co(NH_3)_6]^{2+}$
	$[Zn (NH_3)_4]^{2+}$

	$[Ni(H_2O)_6]^{2+}$

Question

A co – ordination compound of platinum chloride and ammonia gives a white precipitate with AgNO_3 and on ionization gives four ions. Its formula is

Possible Answers

Selected	Possible Answer

Question

A pale green crystalline in organic salt (x) dissolved freely in water , It gives a brown precipatate on addition of aqueous NaOH . The solution of (x) also gives a black precipitate on bubbling H_2S in alkaline medium . An aqueous solution of (x) decolourizes the pink colour of the permanganate solution. The metal in the salt solutions is

Possible Answers

Selected	Possible Answer
	Copper
	Iron
	Aluminum
	Lead

Question

The blue colour obtained by the addition of excess dil. NH_4OH to an aqueous solution of a salt containing

Possible Answers

Selected	Possible Answer
	$Zn^{+2}$
	$Ba^{+2}$
	$Cu^{+2}$
	$Al^{+3}$

Question

On treatment with Kl, mercuric chloride gives a product X which is soluble in excess KI to form another product Y, X and Y are

Possible Answers

Selected	Possible Answer
	and $HgI_2 ^{-}$
	and
	and
	and

Question

Select correct statement

Possible Answers

Selected	Possible Answer
	both correct
	$MnO_4 ^{-}$ has in (VII) but colour arises due to charge transfer from $O^{2-}$ to giving configuration to
	none of correct
	is yellow when hot and white when cold due to defect in crystal

Question

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water . When another D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner , A, B,C and D respectively are

Possible Answers

Selected	Possible Answer

Question

The IUPAC name of the compound

Possible Answers

Selected	Possible Answer
	2- methyl pent-3-yne –3- ene
	2- methyl pent-2-ene –3- yne
	2- methyl pent-1-ene –3- yne
	4- methyl pent-4-ene –2- yne

Question

The eclipsed and staggered conformation of ethane due to

Possible Answers

Selected	Possible Answer
	Free rotation about C – C single bond
	Absence of rotation about C – C bond
	Restricted rotation about C – C single bond
	None of the above

Question

The two isomers given below are

Possible Answers

Selected	Possible Answer
	Position isomers
	Diastereomers
	Enantiomers
	Regiomers

Question

Which of the following statement about optical activity is incorrect :

Possible Answers

Selected	Possible Answer
	Essential condition for a compound to exhibit optical isomerism is that the mirror images are super imposable
	A molecule with an asymmetric carbon atom has stereoisomers, which are optically active
	Essential condition for a compounds to exhibit optical isomerism is that the mirror images are super imposable
	Essential condition for compounds to exhibit optical isomerism is that there should be dissymmetry in the molecule.

Question

In the following compounds

The order of basicity is :

Possible Answers

Selected	Possible Answer
	I > III > II > IV
	II > I > III > IV
	IV > I > III > II
	III > I > IV > II

Question

Possible Answers

Selected	Possible Answer
	A
	B
	mixture of both A and B
	C

Question

Among these, which of the following is correct order of the extent of aromaticity

Possible Answers

Selected	Possible Answer
	III > II > I
	I > III > II
	I> II > III
	III > I > II

Question

Which is true about this reaction

Possible Answers

Selected	Possible Answer
	P is meso 1,2 butan –di –ol formed by syn addition
	P is a racemic mixture of 1,2, butan di-0l formed by syn addition
	P is recemic mixture of d and I , 1,2 butan –diol formed by anti addition
	P is meso 1,2 butan – di –ol formed by anti addition

Question

Possible Answers

Selected	Possible Answer
	c
	d
	a
	b

Question

The correct order of basicity of following compounds is

Possible Answers

Selected	Possible Answer
	i> ii>iii > iv
	i> iii> ii > iv
	iii> i > ii> iv
	ii >i > iii > iv

Question

Possible Answers

Selected	Possible Answer

Question

Possible Answers

Selected	Possible Answer
	!{width:130px}
	!{width:130px}
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	!{width:130px}

Question

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Selected	Possible Answer

Question

One mole of an organic compound ‘A’ $C_8H_{12}$ , in capable of showing steroisomerism reacts with only one mole of H_2 on Hydrogenation over Pd, A undergoes ozonolysis to form a symmetolcas diketane $B (C_8H_{12}O_2)$ . Teh compundA’ is :

Possible Answers

Selected	Possible Answer

	None

Question

Possible Answers

Selected	Possible Answer

Question

Which of the following methods can be used for the preparation of acetylene?

Possible Answers

Selected	Possible Answer
	$CH_3CHCl_2+alc.KOH\rightarrow$
	$ClCH_2CH_2Cl+alc.KOH\rightarrow$
	$ClCH_2CH_2Cl+NaNH_2\quad\quad {\xrightarrow[\Delta]{liq. NH_3}}$
	None of these

Question

Which of the following statements are correct:

Possible Answers

Selected	Possible Answer
	Jones reagent, which is chromic acid in aqueous acetone solution oxidises $1^{\circ}$ alcohol to aldehyde and $2^{\circ}$ alcohol to ketone but does not effect double bound
	. in acetone oxidises $2^{\circ}$ alchohol to ketones
	All are correct
	Chromic acid oxidises $1^{\circ}$ alcohols to carboxylic acid