Which of the following are redox reactions-a- Zn-2HCl- Zn Cl 2 - H 2b- Al OH 3 -3HCl- Al Cl 3 -3 H 2 Oc- Ag - I - Agld- Disproportionation of Cu- in aqueous solution-

The correct option is A a and dThe reactions a and d are redox reactions.a. nbsp; Zn+2HCl⟶ Zn Cl _ 2 + H _ 2 Zinc is oxidized and HCl is reduced.d. nb ...

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Byju's Answer

Standard XII

Chemistry

Methods to Form Lyophobic Colloids

Which of the ...

Question

Which of the following are redox reactions?
a. $Z n + 2 H C l ⟶ Z n {C l}_{2} + H_{2}$
b. $A l {(O H)}_{3} + 3 H C l ⟶ A l {C l}_{3} + 3 H_{2} O$
c. ${A g}^{\oplus} + I^{⊖} ⟶ A g l$
d. Disproportionation of ${C u}^{\oplus}$ in aqueous solution.

a and d

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a, b and d

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c and d

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All of them

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Solution

The correct option is A a and d
The reactions a and d are redox reactions.
a. $Z n + 2 H C l ⟶ Z n {C l}_{2} + H_{2}$
Zinc is oxidized and HCl is reduced.
d. Disproportionation of ${C u}^{\oplus}$ in aqueous solution.
$2 C u^{+} \to C u^{2 +} + C u$
One cuprous ion is oxidized to cupric ion and other cuprous ion is reduced to copper.
Following reactions are not redox reactions as there is no change in the oxidation number.
b. $A l {(O H)}_{3} + 3 H C l ⟶ A l {C l}_{3} + 3 H_{2} O$
c. ${A g}^{\oplus} + I^{⊖} ⟶ A g l$

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Similar questions

Q. Write the following reaction

(a) Dissolution of CuS precipitate in dil.

H N O - 3

3 C u S + 8 H N O_{3} ⟶ 3 C u (N O_{3})_{2} + 2 N O + 4 H_{2} O + 3 H_{2} O

(b) Dissolution of HgS precipitate in aqua regia

3 H g S + 2 (H N O_{3} + 3 H C l a q u a r e g i a) △ ⟶ 3 H g C l_{2} + 2 N O + 3 S

A g_{2} S_{3}

in aqueous NaOH

A s_{2} S_{3} + 6 N a O H ⟶ N a_{3} A s O_{3} + N a_{3} A s S_{3} + 3 H_{2} O + 4 H_{2} O

(d) Stannite

[S n (O H)_{3}]^{-}

ion disproportionate on long exposure to air

2 [S n (O H)_{3}]^{-} \to S n (s) + [S n (O H)_{6}]^{2 -}

Which of the given reactions are false?

Q. Which of the following reactions are disproportion reactions?
(a)

C u^{+} \to C u^{2 +} + C u

(b)

3 M n O_{4}^{- 2} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O

(c)

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

(d)

2 M n O_{4}^{-} + 3 M n^{+ 2} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

1) Zn + 2HCl ----> Zn Cl2 + H2

Q. Which of the following reactions are disproportionation reactions?
a)

2 C u^{+}

\to

C u^{2 +}

C u^{0}

3 M n O_{4}^{2 -}

4 H^{+}

\to

2 M n O_{4}^{-}

M n O_{2}

2 H_{2} O

2 K M n O_{4}

△ - \to

K_{2} M n O_{4}

M n O_{2}

O_{2}

2 M n O_{4}^{-}

3 M n^{2 +}

2 H_{2} O

⟶

5 M n O_{2}

4 H^{+}

Q. Among the species A : (

C r C l_{3}

); B : (

C u S

); C : (

A l C l_{3}

); D : (

Z n C l_{2}

); which will be soluble in excess of

N a O H

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Which of the following are redox reactions?a. Zn+2HCl⟶ZnCl2+H2b. Al(OH)3+3HCl⟶AlCl3+3H2Oc. Ag⊕+I⊖⟶Agld. Disproportionation of Cu⊕ in aqueous solution.

Which of the following are redox reactions?
a. $Z n + 2 H C l ⟶ Z n {C l}_{2} + H_{2}$
b. $A l {(O H)}_{3} + 3 H C l ⟶ A l {C l}_{3} + 3 H_{2} O$
c. ${A g}^{\oplus} + I^{⊖} ⟶ A g l$
d. Disproportionation of ${C u}^{\oplus}$ in aqueous solution.