AIEEE Chemistry Solved Paper

Question

Three isotopes of an element have mass numbers M, ( M + 1) and ( M +2). If mean mass number is ( M+0.5 ) then which of the following ratio may be accepted for M, ( M +1), (M +2) in the order ?

Possible Answers

Selected	Possible Answer
	4 : 1 : 1
	3: 2 : 1
	2 : 1 : 1
	1 : 1 : 1

Question

A substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as

$k_1 = 1.26*10^{-4} sec^{-1}$
$k_2=3.8*10^{-5}sec^{-1}$
The percentage distribution of B and C are -

Possible Answers

Selected	Possible Answer
	80% B and 20 % C
	60% B and 40 % C
	76.83 % B and 23.17% C
	90% B and 10% C

Question

The approach to the following equilibrium was observed kinetically from both directions at 25^0C . If was found that for the reaction
$PtCl_4^{2-}+H_2O\leftrightharpoons Pt(H_2O)Cl_3^-+Cl^-$
$-\frac {[PtCl_4^2 \quad ]}{t}=(3.9*10^{-5}s^{-1})[PtCl_4^{2-}]-(2.1*10^{-3}lit \quad mols^-)[Pt(H_2O)Cl_3^-][Cl^-]$
The value of equilibrium constant for the complexation of fourth Cl^- by Pt(II) is

Possible Answers

Selected	Possible Answer
	53.8
	60
	63.8
	50

Question

A gas decolourises alkaline KMnO_4 solution, but does not give precipitate with AgNO_3 it is -

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Selected	Possible Answer

Question

Identify the product C in the series
$CH_3CN \qquad ^{Na/C_2H_5OH} \qquad A \qquad ^{NHO_2} \qquad B \qquad ^{Tollen's-reagent} \qquad C$

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Selected	Possible Answer

Question

Ethyl acetate reacts with CH_3MgBr to form-

Possible Answers

Selected	Possible Answer
	Acid
	Tetriary alcohol
	Secondary alcohol
	Primary alchol and acid

Question

Heaviest particle is

Possible Answers

Selected	Possible Answer
	Neutron
	Proton
	Electron
	Meson

Question

The half-life of $_{92}U^{238}$ is 4.5*10^9 years. After how many years, the amount of $_{92}U^{238}$ will be reduced to half of its presents amount?

Possible Answers

Selected	Possible Answer
	$4.5*10^{4.5}$ years
	years
	years
	years

Question

An arsenious sulphide sol carries a negative charge. The maximum precipitating power for this sol is possessed by -

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Question

Acetic acid and propionic acid have K_a values $1.75*10^{-5}$ and $1.3*10^{-5}$ respectively at 25^0C . An equimolar solution of mixture of two acids is partially neutralized by NaOH. How is the ratio of the contents of acetate and propionate ions related to the K_C values and molarity?

Possible Answers

Selected	Possible Answer
	The ratio is unrelated to molarity
	$\frac {}{1} \quad \frac {1.75}{1.3} \quad \frac {}{1}$ where $\alpha$ and $\beta$ are ionised fractions of acids
	The ratio is unrelated to the pH of the solution
	The ratio is unrelated to values