5 mL of N HCl, 20 mL of N/2 H2SO4 and 30 mL of N/3 HNO3 are mixed together and volume made to one litre. The normality of resulting solution is:
0.45
0.025
0.9
0.05
The number of gram molecules of oxygen in 6.02 × 1024 CO molecules is :
10 g molecules
5 g molecules
1 g molecules
0.5 g molecules
The sulphate of a metal M contains 9.87% of M. The sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is
40.3
36.3
24.3
11.3
30 g of magnesium and 30 g of oxygen are reacted, then the residual mixture contains
60 g of magnesium oxide only
40 g of magnesium oxide and 20 g of oxygen
45 g of oxygen and 15 g of magnesium oxide
50 g of magnesium oxide and 10 g of oxygen
The total number of electrons present in 18 mL of water (density of water is 1 gmL-1) is
6.02 × 1023
6.02 × 1024
6.02 × 1025
Assuming that the density of water to be 1g/cm3, calculate the volume occupied by one molecule of water
2.989 × 10-23 cm3
6.023 × 1023 cm3
22400 mL
18 cm3
A metal oxide contains 53% metal and carbon dioxide contains 27% carbon. Assuming the law of reciprocal proportions, the percentage of metal in the metal carbide is
75
25
37
66
3 g of an oxide of a metal is converted to chloride completely and it yielded 5 g of chloride. The equivalent weight of the metal is:
3.325
33.25
12
20
The number of water molecules present in a drop of water (volume 0.0018 mL) at room temperature is :
6.023 × 1019
1.084 × 1018
4.80 × 1017
6.023 × 1023
If 1 mL of water contains 20 drops, what is the number of water molecules in the one drop of water ? (A = Avogadro number)
0.5/18 A
0.05 A
0.05/18 A
0.5 A
