Redox reactions - Live Session

In the conversion, $H_{2} {SO}_{4} \to H_{2} S_{2} O_{8}$ which process occurs?
1. Oxidation
2. Reduction
3. Oxidation as well as a reduction
4. Neither oxidation nor reduction

In the reaction,
$2 C u^{+} \to$ C $u + C u^{2 +},$ the equivalent weight of $C u^{+}$ is (M is the mol. wt. of $C u^{+}$ )
1. M
2. $\frac{M}{2}$
3. $\frac{M}{4}$
4. 2M

For the reachtion, $M n O_{4}^{2} \to M n O_{4}^{-} + M n O_{2},$ How many moles of Mn $O_{4}^{-} a n d M n O_{2} a r e$ obtained after the disproportionation of one mole of Mn $O_{4}^{2 -}$ respectively?
1. $\frac{2}{3} a n d \frac{1}{3}$
2. $\frac{2}{3} a n d \frac{2}{3}$
3. $\frac{1}{2} a n d \frac{1}{2}$
4. 2 and 1

Equal volumes of 1 M each of KMnO $_{4}$ and $K_{2} C r_{2} O_{7}$ are used to oxidise Fe(II) solution in acidic medium. The amount of Fe oxidised will be
1. More with KMnO $_{4}$
2. More with $K_{2} C r_{2} O_{7}$
3. Equal with both oxidising agent
4. Cannot be determined

1 mole of $N_{2} H_{4}$ loses 10 moles of electrons to form a new compound y. Assuming that all nitrogen appears in the new compound, what is the oxidation state of nitrogen in y?
(There is no change in the oxidation state of hydrogen)
1. +3
2. -3
3. -1
4. +5

When Cl $_{2}$ is converted $C l^{-} a n d C l O_{3}^{-} t h e n n - f a c t o r o f C l_{2} w i l l b e$
1. 3/5
2. 5/3
3. 5/6
4. 2

The number of peroxide linkages in $K_{3} C r O_{8}$ is/are
1. 1
2. 2
3. 3
4. 4

Which acts as a reducing agent only?
1.   $H_{2} S$
2.   $S O_{2}$
3.   $H N O_{3}$
4.   $K M n O_{4}$

Valency factor ( $V_{f}$ ) for following redox reaction is respectively
i. ${\frac{{As}_{2} S_{3}}{}}^{\underset{}{\to} A s O_{3}^{-} + S O_{4}^{2 -}}$
ii. ${\frac{I_{2}}{}}^{\underset{}{\to} I^{-} + {IO}_{3}^{-}}$
iii. ${\frac{H_{3} {PO}_{2}}{}}^{\underset{}{\to} P H_{3} + 2 H_{3} P O_{3}}$
1. $28, \frac{5}{3}, \frac{4}{3}$
2. $28, \frac{4}{3}, \frac{5}{3}$
3. 6, 4, 7
4. 4, 3, 9

10.

In which reaction: $H_{2} O_{2} a c t s a s r e d u c i n g a g e n t ?$
1. $A g_{2} O + H_{2} O_{2} \to 2 A g + H_{2} O + O_{2}$
2. $2 K I + H_{2} O_{2} \to 2 K O H + I_{2}$
3. $P b s + 4 H_{2} O_{2} \to P b s O_{4} + 4 H_{2} O$
4. $H_{2} O_{2} + S O_{2} \to H_{2} S O_{4}$

11.

In the equation,
$N O_{2}^{-} + H_{2} O \to {NO}_{3}^{-} + 2 H^{+} + n e^{-}$ , n stands for:
1. 1
2. 2
3. 3
4. 4

12.

The reaction ,
$3 C l O^{-} (a q) \to C l O_{3}^{-} (a q) + 2 C l^{-} (a q) i s a n e x a m p l e o f :$
1. oxidation reaction
2. reduction reaction
3. disproportionation reaction
4. decomposition reaction

13.

The oxidation number of Pt in
${[P t (C_{2} H_{4}) C l_{3}]}^{-}$ is :
1. +1
2. +2
3. +3
4. +4

14.

The oxidation number of S in $N a_{2} S_{4} O_{6}$ is:
1. +2.5
2. +2 and +3 (two S have +2 and one S has +3)
3. +2 and +3 (three S have +2 and one S has +3)
4. +5 and 0 (two S have+5 and the other two S have 0)

15.

The oxidation number of phosphorus in Ba( $H_{2} P_{2} O)_{2}$ is:
1. +3
2. +2
3. +1
4. -1

16.

A, B and C are three elements forming a part of compound in oxidation states of + 2 + 5 - 2 respectively. What could be the compound ?
1. $A_{2} {(B C)}_{2}$
2. $A_{2} {(B C_{4})}_{3}$
3. $A_{3} {(B C_{4})}_{2}$
4. $A B C$

17.

Consider the following reaction :
$x M n O_{4}^{-} + y C_{2} O_{2}^{2 -} + z H^{+} \to x M n^{2 +} + 2 y C O_{2} + \frac{z}{2} H_{2} O$
The values of x, y and z in the reaction are respectively :
1. 2,5 and 16
2.5, 2 and 8
3.5, 2 and 16
4. 2, 5 and 8

18.

Which of the following is a redox reaction :
1. $N a C l + K N O_{3} \to N a N O_{3} + K C l$

2. $C a C_{2} O_{4} + 2 H C l \to C a C l_{2} + H_{2} C_{2} O_{4}$
3. $M g {(O H)}_{2} + 2 N H_{4} C l \to M g C l_{2} + 2 N H_{4} O H$
4. $Z n + 2 A g C N \to 2 A g + Z n {(C N)}_{2}$

19.

0.5 gm of an oxalate sample is issolved in water and diluted upto 100 ml. 10 ml of this
solution is completely oxidised with 15 ml N/20 KMnO $_{4}$ in acidic medium. The
percentage purity of sample is
1. 33%
2. 44%
3. 66%
4. 88%

20.

$10 g o f a m i x t u e o f C u_{2} S a n d C u S i s r e a c t e d w i t h 150 m l 1 M K M n O_{4} p r o d u c i n g C u^{2 +} M n^{2 +} a n d S O_{2} . T h e e x c e s s o f K M n O_{4} i s c o m p l e t e l y r e a c t e d w i t h 175 m l 1 M l 1 M F e^{2 +} i n a c i d i c m e d i u m . P e r c e n t a g e o f C u S i n t h e m i x t u r e w i l l b e$
1. 37%
2. 47
3. 57%
4. 67%

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