10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction will be:
1. 2 mol
2. 3 mol
3. 4 mol
4. 1 mol
The number of atoms in 0.1 mole of a triatomic gas is:
(NA=6.02 x1023mol-1)
1. | 6.026 x 1022 | 2. | 1.806x1023 |
3. | 3.600 x 1023 | 4. | 1.800 x 1022 |
When 50 mL of a 16.9 % (w/v) solution of AgNO3 is mixed with 50 mL of 5.8% (w/v) NaCl solution, then the mass of precipitate formed is:
(Ag = 107.8, N = 14, O = 16, Na= 23,Cl=35.5)
1. | 28 g | 2. | 3.5 g |
3. | 7 g | 4. | 14 g |
If the Avogadro number NA, is changed from 6.022 x 1023 mol-1 to 6.022 x 1020 mol-1 this would change:
1. The definition of mass in units of grams.
2. The mass of one mole of carbon.
3. The ratio of chemical species to each other in a balanced equation.
4. The ratio of elements to each other in a compound.
An organic substance containing C, H, and O gave the following percentage composition :
C = 40.687%, H = 5.085% and O = 54.228%. The vapour density of this organic substance is 59.
The molecular formula of the compound will be:
1. C4H6O4
2. C4H6O2
3. C4H4O2
4. None of the above
The number of gram molecules of oxygen in 6.02 × 1024 CO molecules are:
1. 10 g molecules
2. 5 g molecules
3. 1 g molecules
4. 0.5 g molecules
4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be:
1. | Carbon dioxide | 2. | Carbon monoxide |
3. | Oxygen | 4. | Sulphur dioxide |
On reduction with CO, 200 kg of iron ore (Fe2O3) containing 20% impurities gives iron. The amount of iron produced will be-
1. 84 kg
2. 200 kg
3. 56 kg
4. 112 kg
Calculate the number of ions present in 2L of a solution of 1.6 M K4[Fe(CN)6]:
1. | 4.8 x 1022 | 2. | 4.8 x 1023 |
3. | 9.6 x 1024 | 4. | 9.6 x 1022 |
What is the ratio of the number of atoms in 2.2 g of CO2 and in 1.7 g of NH3?
1. | 1/2 | 2. | 1/8 |
3. | 3/8 | 4. | 3/2 |