$E^{⊝}$ values of some redox couples are given below. On the basis of these values choose the correct option.

\(\begin{aligned} &\mathrm{E}^{\ominus} \text { values : } \mathrm{Br}_2 / \mathrm{Br}^{-}=+1.90 ; \mathrm{Ag}^{+} / \mathrm{Ag}(\mathrm{s})=+0.80\\ &\mathrm{Cu}^{2+} / \mathrm{Cu}(\mathrm{s})=+0.34 ; \mathrm{I}_2(\mathrm{~s}) / \mathrm{I}^{-}=+0.54 \end{aligned}\)

1. Cu will reduce Br^-

2. Cu will reduce Ag

3. Cu will reduce I^-

4. Cu will reduce Br₂

In which of the following compounds, an element exhibits two different oxidation states:

1. NH₂OH

2. NH₄NO₃

3. N₂H₄

4. N₃H

Which of the following elements does not show disproportionation tendency?

Match column I with column II for the oxidation states of the central atoms.

          Column I                                Column II

(i) Cr₂O₇^2-                                         (a) +3

(ii) MnO₄^-                                          (b) +4

(iii) VO₃^-                                           (c) +5

(iv) FeF₆^3-                                         (d) +6

                                                        (e) +7

1. (i)-(d), (ii)-(e), (iii)-(c), (iv)-(a)

2. (i)-(c), (ii)-(e), (iii)-(a), (iv)-(d)

3. (i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)

4. (i)-(b), (ii)-(c), (iii)-(d), (iv)-(e)

Match the items in Column I with relevant items in Column II.

       Column I                                                Column II

(i) Ions having positive charge                         (a) +7

(ii) The sum of oxidation number of                  (b) -1

all atoms in a neutral molecule                         (c) +1

(iii) Oxidation number of hydrogen ion (H⁺)      (d) 0

(iv) Oxidation number of fluorine in NaF            (e) Cation

(v) Ions having negative charge                        (f) Anion

1. (i)-(e), (ii)-(d),  (iii)-(c),  (iv)-(b), (v)-(f)

2. (i)-(a), (ii)-(d),  (iii)-(c),  (iv)-(b), (v)-(f)

3. (i)-(e), (ii)-(d),  (iii)-(a),  (iv)-(b), (v)-(f)

4. (i)-(b), (ii)-(d),  (iii)-(e),  (iv)-(a), (v)-(f)

In which of the following compounds, nitrogen exhibits highest oxidation state?

1. $N_2{H}_4$

2. $N{H}_3$

3. $N_{3}H$

4. $N{H}_{2}OH$

The oxidation state of Cr in $Cr{O}_6$ is -

1. -6

2. +12

3. +6

4. +4

Which of the following cannot act as an oxidizing agent?

1. $S^{2-}$

2. $B{r}_2$

3. $HS{O}_4^{-}$

4. $S{O}_3^{2-}$

1.250 g of metal carbonate $\left(MC{O}_3\right)$ was treated with 500 mL of 0.1 M HCl solution. The unreacted HCl required 50.0 mL of 0.500 M NaOH solution for neutralization. Identify the metal M

1. Mg

2. Ca

3. Sr

4. Ba

The species which is unable to show disproportionation reaction is

1. $Cl{O}_3^{-}$

2. $Cl{O}_4^{-}$

3. $Cl{O}_2^{-}$

4. $Cl{O}^{-}$