Q. No.Which of the following is the molality of a 15% (w/v) H₂SO₄ solution having a density of 1.1 g/cm³?
1. 1.2 mol/kg
2. 1.4 mol/kg
3. 1.8 mol/kg
4. 1.6 mol/kg
100 mL of H₂SO₄ solution having molarity 1 M and density 1.5 g mL⁻¹ is mixed with 400 mL water.
If the density of the final solution is 1.25 g mL⁻¹, calculate the molarity of the final H₂SO₄ solution.
| 1. | 4.4 M | 2. | 0.145 M |
| 3. | 0.52 M | 4. | 0.227 M |
| Assertion (A): | 1 g O2 and 1 g O3 have an equal number of oxygen atoms. |
| Reason (R): | O2 and O3 have different molar masses. |
| 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. |
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) |
| List-I | List-II | ||
| a. | Micro | i. | m |
| b. | Mega | ii. | m |
| c. | Giga | iii. | m |
| d. | Femto | iv. | m |
| a | b | c | d | |
| 1. | i | iv | iii | ii |
| 2. | iii | iv | ii | i |
| 3. | ii | iii | iv | i |
| 4. | i | iii | iv | ii |
At 100 ºC and 1 atm, if the density of liquid water is 1.0 g cm–3 and that of water vapor is 0.0006 g cm-3, then the volume occupied by water molecules in 1 litre of steam at that temperature will be:
| 1. | 6 cm3 | 2. | 60 cm3 |
| 3. | 0.6 cm3 | 4. | 0.06 cm3 |
Which of the following values is closest to the density of CCl₄ vapour (in g/L) at STP?
1. 8.67
2. 6.87
3. 3.67
4. 4.26
Find the Celsius scale reading corresponding to a temperature of 200°F.
1. 40°C
2. 94°C
3. 93°C
4. 30°C
Which of the following correctly represents 234,000 and 6.0012 in scientific notation?
| 1. | \(2.34 \times 10^{-9} \text { and } 6 \times 10^3\) |
| 2. | \(0.234 \times 10^{-6} \text { and } 60012 \times 10^{-9}\) |
| 3. | \(2.34 \times 10^{-9} \text { and } 6.0012 \times 10^{-9}\) |
| 4. | \(2.34 \times 10^5 \text { and } 6.0012 \times 10^0\) |
Determine the number of significant figures in the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\):
| 1. | Two (2) | 2. | Four (4) |
| 3. | Six (6) | 4. | Seven (7) |
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