What is the equivalent weight of H₃PO₃ in the following disproportionation reaction:-

H₃PO₃ $\to$H₃PO₄ + PH₃

1. $\frac{M}{6}$   

 2. $\frac{M}{2}$ 

3.  $\frac{2M}{3}$ 

 4. $\frac{M}{3}$

Identify the substance acting as an oxidant in the following reaction:

BaCl₂ + Na₂SO₄$\to$BaSO₄ + 2NaCl

1. BaCl₂

2. Na₂SO₄

3. NaCl

4. None of the these

In the reaction:

Al + Fe₃O₄  → Al₂O₃ + Fe

How many electrons are transferred in total during the reaction?

1. 6

2. 8

3. 8/3

4. 24

A metallic oxide contains 40% oxygen then equivalent weight of metal is 

1. 48

2. 36

3. 24

4. 12

3Cl₂ + 6NaOH $\to$5NaCl + NaClO₃ + 3H₂O, the equivalent weight of NaOH will be

1. 40

2. 48

3. 60

4. 80

In the conversion, H₂SO₄ $\to \hspace{0.17em}$H₂S₂O₈ which process occurs?

1. Oxidation

2. Reduction

3. Oxidation as well as reduction

4. Neither oxidation nor reduction

Oxidation number of carbon in CH₂Cl₂ is 

1. -4

2. +4

3. -2

4. zero

Equivalent weight of a metal oxide is 20, the equivalent weight of sulphate of same metal will be 

(1) 60

(2) 69

(3) 108

(4) 54

15 gm Ba(MnO₄)₂ sample containing inert impurity is completely reacting with 100 ml of '11.2 V' H₂O₂, then what will be the % purity of Ba (MnO₄)₂ in the sample ? (Atomic mass Ba = 137, Mn = 55)

(1) 5%

(2) 10%

(3) 50%

(4) none

The equivalent mass of H₃BO₃ (M = Molar mass of H₃BO₃) in its reaction with NaOH to from Na₂B₄O₇ is equal to –

(1) M

(2) $\frac{\text{M}}{\text{2}}$

(3) $\frac{\text{M}}{4}$

(4) $\frac{\text{M}}{6}$