Which of the following contains maximum number of molecules?
1 g CO2
1 g N2
1 g H2
1 g CH4
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 2KClO3 → 2KCl + 3O2↑
3 moles
6 moles
9 moles
12 moles
The volume occupied by one mole of a gas at S.T.P. is known as
Atomic volume
Molar volume
Gaseous volume
Thermal volume
A sample of CaCO3 contain 3.01 × 1023 ions of Ca2+ and CO32-. The mass of the sample is
100 g
50 g
200 g
5 g
A gas cylinder of capacity of 20dm3 is filled with gas 'X' the mass of which is 10g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass of the hydrogen is 2 g, hence the relative mass of the gas is
5
10
15
20
If empirical formula of an organic compound is CH2O then its molecular formula can be
C2H2O2
C2H4O
C3H6O
C6H12O6
1 mole of water contains 6.022 × 1023 water molecules and weighs
18g
80g
8g
16g
The relative molecular mass of Na2S2O3.5H2O is
250 a.m.u.
250 g
248 a.m.u.
248 g
A mole of CH4 contains how many grams of molecules?
16 g
18 g
12 g
14 g
The gas law which relates the volume of a gas to the number of molecules of the gas is
Avogadro's law
Gay Lussac's law
Boyle's law
Charle's law
