1
MCQ (Single Correct Answer)

AIPMT 2000

Volume of CO2 obtained by the complete decomposition of 9.85 g of BaCO3 is
A
2.24 L
B
1.118 L
C
0.84 L
D
0.56 L

Explanation

BaCO3 $$ \to $$ BaO + CO2

197.34 g $$ \to $$ 22.4 L at N.T.P

9.85 g $$ \to $$ $${{22.4} \over {197.34}} \times 9.85 = 1.118\,L$$
2
MCQ (Single Correct Answer)

AIPMT 2000

In quantitative analysis of second group in laboratory, H2S gas is passed in acidic medium for precipitation. When Cu2+ react with KCN, then for product, true statement is
A
K2[Cu(CN)4] more soluble
B
K2[Cd(CN)4] less stable
C
K2[Cu(CN)2] less stable
D
K2[Cd(CN)3] more stable

Explanation

K3[Cu(CN)2] = 3(+1)+x+2(-1) = 0

$$ \Rightarrow $$ x = -1

$$ \therefore $$ the oxidation no. of 'Cu' is -1 (-ve), so this complex is unstable so it is not formed.

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