The molality of pure water is:
1. 1 m
2. 18 m
3. 55.5 m
4. None of the above
The density of a 2 M aqueous solution of NaOH is 1.28 g/. The molality of the solution is:
[molecular mass of NaOH = 40 ]
1. | 1.20 m | 2. | 1.56 m |
3. | 1.67 m | 4. | 1.32 m |
The mass of carbon present in 0.5 mole of K4[Fe(CN)6] is:
1. | 1.8 g | 2. | 18 g |
3. | 3.6 g | 4. | 36 g |
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 |
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. |
The haemoglobin from the red blood corpuscles contains approximately 0.33% iron
by mass. The molar mass of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is :
(atomic mass of iron=56):
1. | 2 |
2. | 3 |
3. | 4 |
4. | 5 |
The average molar mass of the mixture of and present in the mole ratio of a:b is
20 g mol-1. When the mole ratio is reversed, the molar mass of the mixture will be:
1. | 24 gram | 2. | 42 gram |
3. | 20 gram | 4. | 15 gram |
The vapour density of a mixture containing and is 38.3. The mole of in a 100 g mixture is:
[Vapour density = (Molar mass / 2)]
1. 0.437
2. 0.347
3. 0.557
4. 0.663
25.4 g of and 14.2 g of are made to react completely to yield a mixture of ICI and ICI3. The mole of ICI and ICI3 formed, is respectively -
1. 0.5, 0.2
2. 0.1, 0.1
3. 0.1, 0.3
4. 0.3, 0.4