Q. No.
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10 g of a silver coin, when dissolved completely in excess of conc. HNO3 gives 8.5 g of silver nitrate.
The percentage purity of the coin is:
(Molar mass of silver is 108g)
| 1. | 25% | 2. | 54% |
| 3. | 67% | 4. | 100% |
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| Assertion (A): | 1 a.m.u = 1 .66 × 10−24 gram. |
| Reason (R): | The actual mass of one atom of C-12 is equal to 1.99 × 10-23 g. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
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| Assertion (A): | The number of molecules in 2 moles of NH3 is equal to the number of molecules in 4 moles of CH4. |
| Reason (R): | Both are chemically similar species. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
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| Assertion (A): | When 4 moles of H2 reacts with 2 moles of O2, then 4 moles of water are formed. |
| Reason (R): | O2 will act as a limiting reagent. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
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When 22.4 L of H2 (g) is mixed with 11.2 L of Cl2 (g), each at STP, the moles of HCl(g) formed is equal to -
| 1. | 1 mole of HCl (g) | 2. | 2 moles of HCl (g) |
| 3. | 0.5 mole of HCl (g) | 4. | 1.5 mole of HCl (g) |
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In sodium sulphate (Na2SO4), the mass percent of sodium, sulfur and oxygen is:
1. 32.4%, 45.05%, 22.6%
2. 22.6%, 45.05%, 32.4%
3. 32.4%, 22.6%, 45.05%
4. 45.05%, 32.4%, 22.6%
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The amount of copper (in grams) that can be obtained from 100 g of copper sulphate (CuSO4) is:
| 1. | 54.00 | 2. | 39.81 |
| 3. | 63.50 | 4. | 159.50 |
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1. Fe3O2
2. Fe2O2
3. Fe2O3
4. Fe3O4
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20 g of sugar is dissolved in enough water to make a final volume of 2L. The concentration of sugar (C12H22O11) in mol L–1 will be:
1. 0.29 mol/L
2. 0.029 mol/L
3. 0.35 mol/L
4. 0.032 mol/L
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