- Subject:
Chemistry

- Chapter:
Redox Reactions

5mL of NHCl, 20 mL of N/2 H_{2}SO_{4} and 30mL of N/3 HNO_{3} are mixed together and volume made one litre. The normality of the resulting solution is:

(a) N/5

(b) N/10

(c) N/20

(d) N/40

When a metal is burnt, its mass is increased by 24 percent. The equivalent mass of the metal will be:

(a) 25

(b) 24

(c) 33.3

(d) 76

1g of pure calcium carbonate was found to require 50 mL of dilute HCl for complete reactions. The strength of the HCl solution is given by:

(a) 4N

(b) 2N

(c) 0.4N

(d) 0.2N

The equivalent mass of H_{3}PO_{4} in the following reaction is,

H_{3}PO_{4 }+ Ca(OH)_{2} $\to $CaHPO_{4} + 2H_{2}O

(a) 98

(b) 49

(c) 32.66

(d) 40

1.520g of the hydroxide of a metal on ignition gave 0.995g of oxide. The equivalent mass of metal is:

(a) 1.520

(b) 0.995

(c) 19.00

(d) 9.00

0.5 g of fuming H_{2}SO_{4} (oleum) is diluted with water. This solution is completely neutralised by 26.7 mL of 0.4 N NaOH. The percentage of free SO_{3} in the sample is:

(a) 30.6%

(b) 40.6%

(c) 20.6%

(d) 50%

One g of a mixture of Na_{2}CO_{3} and NaHCO_{3} consumes y equivalent of HCl for complete neutralisation. One g of the mixture is strongly heated, then cooled and the residue treated with HCl. How many equivalent of HCl would be required for complete neutralisation?

(a) 2y equivalent

(b) y equivalent

(c) 3y/4 equivalent

(d) 3y/2 equivalent

The chloride of a metal contains 71% chlorine by mass and the vapour density of it is 50. The atomic mass of the metal will be:

(a) 29

(b) 58

(c) 35.5

(d) 71

The equivalent mass of Zn(OH)_{2} in the following reaction is equal to its,

Zn(OH)_{2} + HNO_{3} $\to $Zn(OH)(NO_{3}) + H_{2}O :

(a) Formula mass/1

(b) Formula mass/2

(c) 2 x formula mass

(d) 3 x formula mass

What will be the normality of a solution obtained by mixing 0.45 N and 0.60 N NaOH in the ratio 2:1 by volume?

(a) 0.4 N

(b) 0.5 N

(c) 1.05 N

(d) 0.15 N