Vapour density of a volatile substance is 4 . Its molar mass would be:
1. 8
2. 2
3. 64
4. 128
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 vapour density of a volatile chloride of a metal is 95 and the specific heat of the metal is 0.13 cal/g. The equivalent mass of the metal will be:
1. 6 g
2. 12 g
3. 18 g
4. 24 g
Which mixture is lighter than humid air?
1.
2.
3.
4.
is absorbed by:
1. Pyrogallol
2. Menthol
3. Turpentine oil
4. Clove oil
Read the following statements (S) and Explanation (E). Choose the correct answers from the codes (1), (2), (3) and (4):
S : An element may have variable equivalent mass.
E : Such elements should possess variable valency.
1. S is correct but E is wrong
2. S is wrong but E is correct
3. Both S and E are correct and E is correct explanation of S
4. Both S and E are correct but E is not correct explanation of S
0.5 g of fuming (oleum) is diluted with water. The solution requires 26.7 mL of 0.4 N for complete neutralization. Find the % of free in the sample of oleum. Also report % of oleum solution.
1. 104.68 %
2. 98 %
3. 106.13%
4. 56 %
Calculate the mass of required to remove the hardness of litre of water containing 1.62 g of calcium bicarbonate per litre.
1. 5.6*10^-6
2. 5.6*10^5
3. 4.8*10^9
4. 1.2*10^-4
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 |
A sample of and weighed 2.21 g is ignited to constant mass of 1.152 g. Calculate the volume of evolved at and 76 cm of pressure.
1.640 ml
2.540 ml
3.500 ml
4.600 ml