Which of the following are redox reactions-I- PCl3 - Cl2- PCl5II- Cu - 2AgNO3- CuNO32 - 2AgIII- CO2 - 2LiOH - Li2CO3 - H2OIV- FeCl2 - 2NaOH - FeOH2 - 2NaCl

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Byju's Answer

Standard XII

Chemistry

Types of Redox Reactions

Which of the ...

Question

Which of the following are redox reactions?
I. $P C l_{3} + C l_{2} \to P C l_{5}$
II. $C u + 2 A g N O_{3} \to C u (N O_{3})_{2} + 2 A g$
III. $C O_{2} + 2 L i O H \to L i_{2} C O_{3} + H_{2} O$
IV. $F e C l_{2} + 2 N a O H \to F e (O H)_{2} + 2 N a C l$

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I and II

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I, II, and III

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I, II, III and IV

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Solution

The correct option is A II
If in a reaction both, oxidation and reduction occurs, then it is called redox reaction.
In $C u + 2 A g N O_{3} ⟶ C u {(N O_{3})}_{2} + 2 A g ↓ ↓ ↓ ↓$
$0$ $x - 1 = 0 x = 1$ $x + 2 (- 1) = 0 x = + 2$ $0$
Oxidation state of $C u$ changes from $0$ to $+$ , it is oxidation.
$A g$ reduced from $+ 1$ to $0$ , it is reduction.
So, all total it is a redox reaction.

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Similar questions

Which of the following are examples of combination reactions?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Q. Which among the following is(are) double displacement reaction(s)?
(i)

P b + C u C l_{2} \to P b C l_{2} + C u

(ii)

N a_{2} S O_{4} + B a C l_{2} \to B a S O_{4} + 2 N a C l

(iii)

C + O_{2} \to C O_{2}

(iv)

C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O

Q. Which of the following represent redox reactions?
I.

{C r}_{2} O_{7}^{2 -} + 2 ⊖ O H ⟶ 2 C r O_{4}^{2 -} + H_{2} O

II.

Z n + C u S O_{4} ⟶ Z n S O_{4} + C u

III.

2 M n O_{4}^{⊖} + 3 {M n}^{2 +} + 4 ⊖ O H ⟶ 5 M n O_{2} + 2 H_{2} O

IV.

2 {C u}^{\oplus} ⟶ C u + {C u}^{2 +}

Q. Which of the following not represents redox reactions?
I.

{C r}_{2} O_{7}^{2 -} + 2 ⊖ O H ⟶ 2 C r O_{4}^{2 -} + H_{2} O

II.

Z n + C u S O_{4} ⟶ Z n S O_{4} + C u

III.

2 M n O_{4}^{⊖} + 3 {M n}^{2 +} + 4 ⊖ O H ⟶ 5 M n O_{2} + 2 H_{2} O

IV.

2 {C u}^{\oplus} ⟶ C u + {C u}^{2 +}

Which of the following are examples of combination reaction?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

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Which of the following are redox reactions?I. PCl3+Cl2→PCl5II. Cu+2AgNO3→Cu(NO3)2+2AgIII. CO2+2LiOH→Li2CO3+H2OIV. FeCl2+2NaOH→Fe(OH)2+2NaCl

Which of the following are redox reactions?
I. $P C l_{3} + C l_{2} \to P C l_{5}$
II. $C u + 2 A g N O_{3} \to C u (N O_{3})_{2} + 2 A g$
III. $C O_{2} + 2 L i O H \to L i_{2} C O_{3} + H_{2} O$
IV. $F e C l_{2} + 2 N a O H \to F e (O H)_{2} + 2 N a C l$