The equivalent weight of H₃PO₂, when it disproportionates into PH₃ and H₃PO₃ is 

1. 66

2. 49.5

3. 33

4. 20.5

In the reaction, 2Cu⁺ $\to$Cu + Cu²⁺, the equivalent weight of Cu⁺ is (M is the mol. wt. of Cu⁺)

1. M

2. M/2

3. M/4

4. 2M

Equal volumes of 1M each of KMnO₄ and ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ are used to oxidize Fe(II) solution in acidic medium. The amount of Fe oxidized will be

1. More with  KMnO₄ 

2. More with K₂Cr₂${\mathrm{O}}_7$ 

3. Equal with both oxidising agent

4. Cannot be determined

Which of the following is Redox reaction?

1. 2Cr${\mathrm{O}}_4^{2-}$ + 2H⁺ $\to$Cr₂${\mathrm{O}}_7^{2-}$ + H₂O

2. CuSO₄ + 4NH₃ $\to$[Cu (NH₃)₄] SO₄

3. 2Na₂S₂O₃ + I₂ $\to$Na₂S₄O₆ + 2NaI

4. Cr₂${\mathrm{O}}_7^{2-}$ + 2OH^- $\to$2Cr${\mathrm{O}}_4^{2-}$ + H₂O

Find the values of X and Y in the balanced reaction:

X HI + Y HNO₃ $\to$NO + I₂ + H₂O

1. X=3, Y=2

2. X=2, Y=3

3. X=6, Y=2

4. X=6, Y=1

An element x reacts with oxygen to form a compound X₂O₃. If the atomic mass of x is 91.5 the equivalent mass of x is:-

1. 30.5

2. 45.75

3. 61

4. 91.5

The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. The atomic weight of the metal is:-

1. 18

2. 9

3. 4.5

4. 36

In the following unbalanced reaction

A²⁺ + B³⁺ $\to$A⁴⁺ + B

The total number of e^- transferred during reaction is: 

1. 2

2. 3

3. 6

4. 8

Which of the following is not an intramolecular redox reaction?

1. NH₄NO₂ $\to$N₂ + 2H₂O

2. 2Mn₂O₇ $\to$4MnO₂ + 3O₂

3. 2KClO₃ $\to$2KCl + 3O₂

4. $2{\mathrm{H}}_2{\mathrm{O}}_2$ $\to$2H₂O + O₂

Which of the following compounds contains oxygen in the −1 oxidation state?