MnO₂ + 4HCl $\to$MnCl₂+2H₂O+Cl₂, the equivalent wt. of HCl will be (M$\equiv$Mol wt of HCl)

1. M

2. M/2

3. 2M

4. M/4

In Na₂S₂O₃, the oxidation number of S is

1. +2

2. +4 & zero

3. +6 & -2

4. +3

Which one of the following acts as a reducing agent only?

1. SO₂

2. HNO₃

3. MnO₂

4. H₂S

Mn${\mathrm{O}}_4^{-}$(aq) + 8H⁺(aq) + 5e^- $\to$Mn²⁺(aq) + 4H₂O(l);${\mathrm{E}}^{°}$=1051V

Cr₂O_7^2-(aq) +14H⁺(aq) + 6e _$\to$2Cr^₃₊(aq) ₊ 7H₂O(l)_{;${\mathrm{E}}^{°}$}=1.38V

Fe³⁺(aq) + e^- _$\to$Fe²⁺(aq);_{${\mathrm{E}}^{°}$}=0.77V

Cl₂(g) + 2e^- _$\to$2Cl^-(aq); _{${\mathrm{E}}^{°}$}= 1.40V

The incorrect statement regarding the quantitative estimation of aqueous  Fe(NO₃)_{2 is -}

1. Mn${\mathrm{O}}_4^{-}$ can be used in aqueous HCl

2. Cr₂O_7^2- can be used in aqueous HCl

3. MnO^-2₄ can be used in aqueous H₂SO₄

4.  Cr₂O_7^2- can be used in aqueous H₂SO₄

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

In the following reaction, balancing coefficients X and Y are:

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