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
The weight of 1 × 1022 molecules of CuSO4.5H2O is
41.59 g
415.9 g
4.159 g
None of these
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
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
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
If 0.5 moles of BaCl2 are mixed with 0.2 moles of Na3PO4, the maximum number of moles of Ba3(PO4)2 that can be formed is:
0.7
0.5
0.30
0.10
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
Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer (atomic mass: O = 16, Cu = 63, N = 14)
I. 1 molecule of oxygen
II. 1 atom of nitrogen
III. 1 × 10-10 g molecular weight of oxygen
IV. 1 × 10-10 g molecular weight of copper
II < I < III < IV
IV < III < II < I
II < III < I < IV
III < IV < I < II
10dm3 of N2 gas and 10 dm3 of gas X at the same temperature contain the same number of molecules. The gas X is
CO
CO2
H2
NO
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