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.
If 500 mL of a 5 M solution is diluted to 1500 mL, the molarity of the resultant solution is:
1. 1.5 M
2. 1.66 M
3. 0.017 M
4. 1.59 M
Mark the species among the following that contains the highest number of atoms.
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 | 1. mol kg-1 |
| B. Molality | 2. mol L-1 |
| C. Pressure | 3. Candela |
| D. Luminous intensity | 4. Pascal |
Codes
| A | B | C | D | |
| 1. | 1 | 4 | 2 | 3 |
| 2. | 2 | 1 | 4 | 3 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
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-
| 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. |
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