- 1(current)
Q. No.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%
Level 1: 80%+
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Links
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%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | One atomic mass unit is defined as one-twelfth of the mass of one carbon-12 atom. |
| Reason (R): | The carbon-12 isotope is the most abundant isotope of carbon and has been chosen as the standard. |
| 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. |
Subtopic: Moles, Atoms & Electrons |
Level 3: 35%-60%
Hints
| Assertion (A): | The combustion of 16 g of methane gives 18 g of water. |
| Reason (R): | In the combustion of methane, water is one of the products. |
| 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. |
Subtopic: Moles, Atoms & Electrons |
68%
Level 2: 60%+
Hints
One mole of oxygen gas at STP is equal to:
| (a) | 6 .022× 1023 molecules of oxygen |
| (b) | 6.022 × 1023 atoms of oxygen |
| (c) | 16 g of oxygen molecule |
| (d) | 32 g of oxygen |
Choose the correct answer from the option given below:
1. (a) and (b)2. (a) and (c)
3. (a) and (d)
4. (c) and (d)
Subtopic: Moles, Atoms & Electrons |
72%
Level 2: 60%+
Hints
Which of the following pairs have the same number of atoms?
| (a) | 16 g of O2 and 4 g of H2 |
| (b) | 16 g of O2 and 44 g of CO2 |
| (c) | 28 g of N2 and 32 g of O2 |
| (d) | 12 g of C and 23 g of Na |
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (b), (d)
Subtopic: Moles, Atoms & Electrons |
84%
Level 1: 80%+
Hints
16 g of oxygen has the same number of molecules as in:
(a) 16 g of CO
(b) 28 g of N2
(c) 14 g of N2
(d) 1.0 g of H2
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (b), (d)
Subtopic: Moles, Atoms & Electrons |
81%
Level 1: 80%+
Hints
The incorrect statements regarding 1 mole of dioxygen gas at STP among the four statements is/are:
| (a) | 16 g of gas |
| (b) | 22.9 L of gas |
| (c) | dioxygen molecules |
| (d) | 11.2 L of gas |
| 1. | (a, b and c) | 2. | (a, b and d) |
| 3. | (b, c and d) | 4. | (a, c and d) |
Subtopic: Moles, Atoms & Electrons |
71%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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