Q. No.An aqueous solution of NaOH has a molarity of 2 M and a density of 1.28 g cm⁻³.
Calculate the molality of the solution:
[Given: Molecular mass of NaOH = 40 g mol-1]
1.
1.20 m
2.
1.56 m
3.
1.67 m
4.
1.32 m
Calculate the molality of the solution:
[Given: Molecular mass of NaOH = 40 g mol-1]
Calculate the mass of carbon contained in 0.5 mole of potassium ferrocyanide, K₄[Fe(CN)₆].
| 1. | 1.8 g | 2. | 18 g |
| 3. | 3.6 g | 4. | 36 g |
Which of the following represents the molality of pure water?
1. 1 m
2. 18 m
3. 55.5 m
4. None of the above
| Assertion (A): | In Haber's process, starting with 5 moles of N2 and 2.5 mol of H2, on complete reaction only 1.66 moles of NH3 were produced. |
| Reason (R): | H2 acts as a limiting reagent in this reaction. |
| 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. |
| 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. |
Determine the volume occupied by water molecules in 1 litre of steam at 100°C and 1 atm, if the densities of liquid water and water vapour are 1.0 g/cm³ and 0.0006 g/cm³, respectively.
| 1. | 6 cm3 | 2. | 60 cm3 |
| 3. | 0.6 cm3 | 4. | 0.06 cm3 |
ln a closed vessel, 50 ml of completely reacts with 200 ml of C2 according to the following equation:
What will be the composition of the gaseous mixture in the system?
1. 100 ml
2. 25 ml
3. 75 ml
4. 10 ml
(Atomic mass of Fe = 56)
1. Two (2)
2. Three (3)
3. Four (4)
4. Five (5)
Calculate the average molar mass of a gaseous mixture containing CH₄ and C₂H₄ in the mole ratio b:a , if the average molar mass at the mole ratio a:b is 20 g mol⁻¹.
| 1. | 24 gram | 2. | 42 gram |
| 3. | 20 gram | 4. | 15 gram |
Which of the following could be the molecular formula of a compound if 44 g of it produces 88 g of CO₂ and 36 g of H₂O on complete combustion?
1.
2.
3.
4.
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