A 100 mL solution of 0.1 N HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 mL of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution.What is the volume of KOH required for completing the titration ?
70 mL
32 mL
35 mL
16 mL
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
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
What is the percentage of water of crystallisation in a sample of blue vitriol ?
34.07%
35.07%
36.07%
37.07%
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
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 weight of 1 × 1022 molecules of CuSO4.5H2O is
41.59 g
415.9 g
4.159 g
None of these
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
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
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
