Equivalent Mass

Q. 1.25 g of a solid dibasic acid is completely neutralised by 25 ml of 0.25 molar $Ba(OH{)}_2$ solution. Molecular mass of the acid is

1. 150
2. 120
3. 200
4. 100

Q. $Ca(OH{)}_2+H_{3}P{O}_4\to CaHP{O}_4+2H_{2}O$ the equivalent weight of $H_{3}P{O}_4$ in the above reaction is

1. 21
2. 27
3. 38
4. 49

Q.

What is valency factor of acids in a given reaction?

1. Number of replaceable ions; in the solution

2. Number of ions of in solution

3. Number of ions in one molecule of acid

4. Number of gram - equivalents

Q.

10g of a metal carbonate on heating gives 5.6 g of its oxide. The equivalent mass of the metal is ?

1. 20

2. 40

3. 10

4. 5

Q.

What is the n-factor / valency factor of $H_{2}C{O}_3$ ?

1. 1

2. 2

3. Either a or b

4. Neither a nor b

Q. What should be the equivalent weight of phosphorous acid, if P=31; O=16; H=1

1. 82
2. 41
3. 20.5
4. None of these

Q.

Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be

1. 26.89
2. 8.9
3. 17.8
4. 26.7

Q.

The molecular formula of a commercial resin used for exchanging ions in water softening is $C_8{H}_{7}S{O}_{3}Na$ (molecular weight = 206). What would be the maximum uptake of $C{a}^{2+}$ ions by the resin when expressed in mole per gram resin?

1. $\frac{2}{309}$

2. $\frac{1}{103}$

3. $\frac{1}{412}$

4. $\frac{1}{206}$

Q.

Calculate the n-factor of $KMn{O}_4$?

1. 5

2. All of the above

3. 1

4. 3

Q. 74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivalent weight of the metal is

1. 35.5
2. 39
3. 78
4. 19.5