If 0.5 moles of BaCl2 is reacted with 0.2 moles of Na3PO4 then the maximum moles of Ba3(PO4)2 formed is:
1. | 0.33 | 2. | 0.25 |
3. | 0.10 | 4. | 0.52 |
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 |
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 |
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
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 |
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
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 molality of a 20% (by mass) CaCO3 solution is :
(Given: Density of solution is 1.2 gm/ml)
1. | 1.25 m | 2. | 2.5 m |
3. | 2.08 m | 4. | 1.5 m |
Consider the given reaction, 2SO2 + O2 2SO3
6.4 g SO2 and 3.2 g O2 to form SO3 . The mass of SO3 formed is:
1. 32 g
2. 16 g
3. 8 g
4. 4 g
A sample of CaCO3 is 50% pure. On heating 1.12 litres of CO2 (at STP) is obtained. The weight of residues left (assuming non-volatile impurity) is:
(Ca = 40, C= 12, O=16)
1. | 7.8 g | 2. | 5 g |
3. | 3.8 g | 4. | 2.8 g |