Q. No.Two students performed the same experiment separately, and each of them recorded two readings of mass, which are given below. The correct reading of mass is 3.0 g. On the basis of the given data, mark the correct option out of the following statements.
Students
Readings
(i)
(ii)
A
3.01
2.99
B
3.05
2.95
1.
The results of both the students' are neither accurate nor precise.
2.
The results of student A are both precise and accurate.
3.
Student B's results are neither precise nor accurate.
4.
The results of student B are both precise and accurate.
1. 1.50 M
2. 1.66 M
3. 0.017 M
4. 1.59 M
1. 4 g He
2. 46 g Na
3. 0.40 g Ca
4. 12 g He
The empirical formula and molecular mass of a compound are and 180 g, respectively. The molecular formula of the compound is:
1. C9H18O9
2. CH2O
3. C6H12O6
4. C2H4O2
If the density of the solution is 3.12 g ml-1, then what will be the mass of the 1.5 ml solution in two significant figures?
| 1. | \(4.4~\mathrm{g}\) | 2. | \(4680 \times 10^{3} ~\mathrm{g}\) |
| 3. | \(4.7~\mathrm{g}\) | 4. | \(46.80~\mathrm{g}\) |
Identify the reaction that does not obey the law of conservation of mass from the provided options:
1.
2.
3.
4.
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 |
Match the following physical quantities with units.
| Physical quantity | Unit | ||
| A. | Molarity | (i) | mol kg–1 |
| B. | Molality | (ii) | mol L–1 |
| C. | Pressure | (iii) | Candella |
| D. | Luminous intensity | (iv) | Pascal |
Codes:
| A | B | C | D | |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (ii) | (i) | (iv) | (iii) |
| 3. | (i) | (iv) | (iii) | (ii) |
| 4. | (iv) | (i) | (iii) | (ii) |
A 10 g silver coin is completely dissolved in excess concentrated HNO₃ and produces 8.5 g of AgNO₃. Given that the molar mass of silver is 108 g mol⁻¹, what is the percentage purity of silver in the coin?
| 1. | 25% | 2. | 54% |
| 3. | 67% | 4. | 100% |
| 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. |
© 2026 GoodEd Technologies Pvt. Ltd.