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
One mole of calcium phosphide on reaction with excess of water gives
One mole of phosphine
Two moles of phosphoric acid
Two moles of phosphine
One mole of phosphorous pentoxide
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
The weight of 1 × 1022 molecules of CuSO4.5H2O is
41.59 g
415.9 g
4.159 g
None of these
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 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
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
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
What is the percentage of water of crystallisation in a sample of blue vitriol ?
34.07%
35.07%
36.07%
37.07%
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
