Which one is correct about CH₂ = CCl₂?

1. Both carbons are in +2 oxidation state.

2.  Both carbons are in +1 oxidation state.

3. One carbon has +2 and other -2 oxidation states.

4. The average oxidation number of carbon is +1.

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. $\frac{M}{3}$

25.0 g of FeSO₄.7H₂O was dissolved in water containing dilute H₂SO₄, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO₄ solution for complete oxidation. The percentage of FeSO₄^. 7H₂O in the acid solution is

(1) 78%

(2) 98%

(3) 89%

(4) 79%

A metallic oxide contains 20% oxygen. The equivalent weight of metal is

1. 12

2. 16

3. 32

4. 64

Amongst the following species that have an atom in (+6) oxidation state is-

1. Mn${\mathrm{O}}_4^{-}$

2. Cr$(\mathrm{CN}{)}_6^{3-}$

3. Ni${\mathrm{F}}_6^{2-}$

4. CrO₂Cl₂

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

(1) HOCl <HOClO <HOClO₂ < HOClO₃

(2) HOClO <HOCl <HOClO₃ <HOClO₂

(3) HOClO₂ <HOClO₃ <HOClO <HOCl

(4) HOClO₃> HOClO₂ <HOClO <HOCl

The valency of Cr in the complex [Cr(H₂O)₄Cl₂]⁺ [MP PMT 2000]

(1) 1

(2) 3

(3) 5

(4) 6

Oxidation number of cobalt in K[Co(CO)₄] is

(1) + 1

(2) + 3

(3) – 1

(4) – 3

When KMnO₄ acts as an oxidizing agent and ultimately forms \(\left[\mathrm{MnO}_4\right]^{-2}, \mathrm{MnO}_2, \mathrm{Mn}_2 \mathrm{O}_3, \mathrm{Mn}^{+2}\)${}^{}$
then the number of electrons transferred in each case, respectively, are:

For the redox reaction $Mn{O}_4^{-}+C_2{O}_4^{-2}+H^{+}\to M{n}^{2+}+C{O}_2+H_{2}O$ the correct coefficients of the reactants for the balanced reaction are