1.
Law of conservation of mass was proposed by
2.
H2 was passed over heated 2 gm of CuO till only Cu was left. The mass of Cu obtained was 1.6 g. The percentage of oxygen in CuO is
3.
The symbol of nitrogen is
4.
Which of the following has maximum number of atoms?
5.
Which of the following is not correct according to Dalton’s atomic theory?
6.
Which of the following would weigh the highest?
7.
Which of the following statements is not true about atom?
8.
Which of the following represents 1 u?
9.
Which of the following molecule has an atomicity of four?
10.
Molecular mass of ozone is
11.
The correct formula of aluminium sulphate is
12.
Percentage of calcium in calcium oxide is
13.
Which one is the correct symbol of copper?
14.
What is the chemical formula of sodium hydrogen carbonate?
15.
46 gm of sodium is equal to
16.
Of two oxides of iron, the first contained 22% and the second contained 30% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen is
17.
Zinc sulphate contains 22.65% Zn and 43.9% H2O. if the law of constant proportions is true, then the mass of zinc required to give 40gm crystal will be
18.
The weight of one molecule of a compound C60 H122 is
19.
Two gaseous samples of the same compound were analysed. One contained 1.2 gm of carbon and 3.3 gm of oxygen. The other contained 27.3% carbon and 72.7% of oxygen. The experimental data follows
20.
If we assume 1/6 th part instead of 1/12 th part of weight of C12 as amu. The molecular mass of water will be
