Q. No.Match the following:
| Column-I | Column-II | ||
| A. | 88 g of CO2 | 1. | 0.25 mol |
| B. | 6.022×1023 molecules of H2O | 2. | 2 mol |
| C. | 5.6 L of O2 at STP | 3. | 3 mol |
| D. | 96 g of O2 | 4. | 1 mol |
| A | B | C | D | |
| 1. | 2 | 4 | 1 | 3 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
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1. 4 g He
2. 46 g Na
3. 0.40 g Ca
4. 12 g He
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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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The formula of an acid is The mass of 0.0242 moles of the acid is 1.657 g.
The atomic weight of X is:
| 1. | 35.5 | 2. | 28.1 |
| 3. | 128 | 4. | 19.0 |
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The maximum number of molecules is present in which of the following?
1. 15 L of gas at STP
2. 5 L of gas at STP
3. 0.5 g of gas
4. 10 g of gas
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An element X has the following isotopic composition,
200X : 90%, 199X : 8.0%, 202X : 2.0%
The weighted average atomic mass of the naturally occurring element X is closest to:
| 1. | 205 u | 2. | 220 u |
| 3. | 196 u | 4. | 200 u |
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100 mL of solution having molarity of 1M and density 1.5 g/mL is mixed with 400 mL of water. The molarity of the solution will be: (final density is 1.25 g/mL )
| 1. | 4.4 M | 2. | 0.145 M |
| 3. | 0.52 M | 4. | 0.227 M |
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What is the ratio of the number of atoms in 2.2 g of CO2 and in 1.7 g of NH3?
| 1. | 1/2 | 2. | 1/8 |
| 3. | 3/8 | 4. | 3/2 |
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