$$ \text { Match List - I with List - II. } $$
| List - I Mass of substance |
List - II Number of atoms |
||
|---|---|---|---|
| A. | 1.8 mg water | I. | $$ 2 \times 10^{-4} \times \mathrm{N}_{\mathrm{A}} $$ |
| B. | 9.8 mg sulphuric acid | II. | $$ 1.5 \times 10^{-4} \times \mathrm{N}_{\mathrm{A}} $$ |
| C. | 1.8 mg carbon | III. | $$ 3 \times 10^{-4} \times \mathrm{N}_{\mathrm{A}} $$ |
| D. | 5.85 mg salt $(\mathrm{NaCl})$ | IV. | $$ 7 \times 10^{-4} \times \mathrm{N}_{\mathrm{A}} $$ |
$$ \text { Choose the correct answer from the options given below : } $$
Which of the following contain the same number of atoms?
(Given : Molar mass in $\mathrm{g} \mathrm{mol}^{-1}$ of $\mathrm{H}, \mathrm{He}, \mathrm{O}$ and S are 1, 4, 16 and 32 respectively)
A. 2 g of $\mathrm{O}_2$ gas
B. 4 g of $\mathrm{SO}_2$ gas
C. 1400 mL of $\mathrm{O}_2$ at STP
D. $0.05 \mathrm{~L}$ of He at STP
E. $ 0.0625 \mathrm{~mol}$ of $\mathrm{H}_2$ gas
Choose the correct answer from the options given below :
An oxide of iron contains $69.9 \%$ iron, its empirical formula, is :
(Given : Molar mass of Fe and O are 56 and $16 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.)
What volume of hydrogen gas at STP would be liberated by action of 50 mL of $\mathrm{H}_2 \mathrm{SO}_4$ of $50 \%$ purity (density $=1.3 \mathrm{~g} \mathrm{~mL}^{-1}$ ) on 20 g of zinc?
Given : Molar mass of $\mathrm{H}, \mathrm{O}, \mathrm{S}, \mathrm{Zn}$ are 1, 16, 32, $65 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.
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