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
Copper forms two oxides. For the same amount of copper, twice as much oxygen was used to form first oxide than to form second one. What is the ratio of the valencies of copper in first and second oxides?
1. 2:5
2. 1:6
3. 2:1
4. 1:2
5 mL of a gaseous hydrocarbon was exposed to 30 mL of . The resultant gas, on cooling is found to measure 25 mL of which 10 mL is absorbed by NaOH and the remainder by pyrogallol. Determine molecular formula of hydrocarbon. All measurements are made at constant room temperature.
1. CH4
2. C2H2
3. C3H4
4.C2H4
60 mL of a mixture of nitrous oxide and nitric oxide was exploded with excess of hydrogen. If 38 mL of was formed, calculate the volume of each gas in the mixture. All measurements are made at constant P and T.
1.20 ml +30 ml
2. 44 ml + 16 ml
3. 10 ml+40 ml
4 .25 ml +25 ml
2.0 g sample containing and loses 0.248 g when heated to 300C, the temperature at which decomposes to , and . What is the % of in mixture?
1.66.5
2.50.6
3.60.5
4.6.65
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
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 |
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