1
MCQ (Single Correct Answer)

AIPMT 2001

Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxide anhydrous enzyme is
A
1.568 $$ \times $$ 104
B
1.568 $$ \times $$ 103
C
15.68
D
2.136 $$ \times $$ 104

Explanation

$${{100} \over {0.5}} \times 78.4 = 1.568 \times {10^4}$$
2
MCQ (Single Correct Answer)

AIPMT 2001

Molarity of liquid HCl, if density of solution is 1.17 g/ce is
A
36.5
B
18.25
C
32.05
D
42.10

Explanation

Molarity = $${{1.17 \times 1000} \over {36.5 \times 1}} = 32.05$$
3
MCQ (Single Correct Answer)

AIPMT 2000

Oxidation numbers of A, B, C are + 2, +5 and $$-$$2 respectively. Possible formula of compound is
A
A2(BC2)2
B
A3(BC4)2
C
A2(BC3)2
D
A3(B2C)2

Explanation

In A3(BC4)2, (+2) $$ \times $$ 3 + 2[+5+4(-2)]

$$ \Rightarrow $$ +6 + 10 -16 = 0

$$ \therefore $$ Oxidation numbers of A, B, C are + 2, +5 and $$-$$2 respectively.
4
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 $$ \to $$ $${{22.4} \over {197.34}} \times 9.85 = 1.118\,L$$

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Class 12