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 |
Subtopic: Moles, Atoms & Electrons |
92%
From NCERT
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4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be:
| 1. | Carbon dioxide | 2. | Carbon monoxide |
| 3. | Oxygen | 4. | Sulphur dioxide |
Subtopic: Moles, Atoms & Electrons |
87%
From NCERT
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Subtopic: Moles, Atoms & Electrons |
85%
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Mark the species among the following that contains the highest number of atoms:
1. 4 g He
1. 4 g He
2. 46 g Na
3. 0.40 g Ca
4. 12 g He
Subtopic: Moles, Atoms & Electrons |
85%
From NCERT
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Subtopic: Moles, Atoms & Electrons |
73%
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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. |
Subtopic: Moles, Atoms & Electrons |
81%
From NCERT
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Subtopic: Moles, Atoms & Electrons |
73%
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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 |
Subtopic: Moles, Atoms & Electrons |
73%
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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 |
Subtopic: Moles, Atoms & Electrons |
70%
From NCERT
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The haemoglobin from the red blood corpuscles contains approximately 0.33% iron
by mass. The molar mass of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is :
(atomic mass of iron=56):
| 1. | 2 |
| 2. | 3 |
| 3. | 4 |
| 4. | 5 |
Subtopic: Moles, Atoms & Electrons |
73%
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