Which of the following combinations illustrates the law of reciprocal proportions?
1.
2.
3.
4.
The formula of an acid is The mass of 0.0242 moles of the acid is 1.657 g.
The atomic weight of X is:
1. | 35.5 | 2. | 28.1 |
3. | 128 | 4. | 19.0 |
The sulphate of the metal M contains 9.87% of M. This sulphate is isomorphous with . The atomic weight of M is:
1. 40.3
2. 36.3
3. 24.3
4. 11.3
Sulphur burns according to the reaction
What volume of air, at 1 atm and 273 K, containing 21% oxygen by volume is required to completely burn sulphur present in 200 g of the sample?
(This sample contains 20% inert material which does not burn)
1. 23.52 litre
2. 320 litre
3. 112 litre
4. 533.33 litre
100 mL of solution having molarity of 1M and density 1.5 g/mL is mixed with 400 mL of water. The molarity of the solution will be: (final density is 1.25 g/mL )
1. | 4.4 M | 2. | 0.145 M |
3. | 0.52 M | 4. | 0.227 M |
Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. If 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weight of X and Y respectively, will be:
1. | 40, 30 | 2. | 60, 40 |
3. | 20, 30 | 4. | 30, 20 |
Which of the following is dependent on temperature?
1. | Molarity | 2. | Mole fraction |
3. | Weight percentage | 4. | Molality |
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. . The evolved gaseous mixture is passed through KOH pellets.
Weight (in g) of the remaining product at STP will be:
1. 1.4
2. 3.0
3. 2.8
4. 4.4
20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g of magnesium oxide.
The percentage purity of magnesium carbonate in the sample will be:
(Atomic weight of Mg=24)
1. | 75 | 2. | 96 |
3. | 60 | 4. | 84 |