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 |
Which of the following combinations illustrates the law of reciprocal proportions?
1.
2.
3.
4.
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 |