The weight of 1 × 1022 molecules of CuSO4.5H2O is
41.59 g
415.9 g
4.159 g
None of these
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
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
What is the percentage of water of crystallisation in a sample of blue vitriol ?
34.07%
35.07%
36.07%
37.07%
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
How much of NaOH is required to neutralise 1500 cm3 of 0.1 N HCl ? (Na = 23)
40 g
4 g
6 g
60 g
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
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
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
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
