Which of the following represent redox reactions?

Question

Which of the following represent redox reactions? (A) Cr 2 O 72-+2 OH - arrow 2 CrO 42-+ H 2 O (B) 2 CrO 42-+2 H + arrow Cr 2 O 72-+ H 2 O (C) 2 MnO 4-+3 Mn 2++4 OH - arrow 5 MnO 2+2 H 2 O (D) 2 Cu + arrow Cu + Cu 2+

Tardigrade Admin · Accepted Answer

Correct answer is (c) 2 MnO 4-+3 Mn 2++4 OH - arrow 5 MnO 2+2 H 2 OCorrect answer is (d) 2 Cu + arrow Cu + Cu 2+

Q. Which of the following represent redox reactions?

$C r_{2} O_{7}^{2 -} + 2 O H^{-} \to 2 C r O_{4}^{2 -} + H_{2} O$

$2 C r O_{4}^{2 -} + 2 H^{+} \to C r_{2} O_{7}^{2 -} + H_{2} O$

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

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

Correct answer is (c) $2 M n O_{4}^{-} + 3 M n^{2 +} + 4 O H^{-} \to 5 M n O_{2} + 2 H_{2} O$ Correct answer is (d) $2 C u^{+} \to C u + C u^{2 +}$

Q. Which of the following represent redox reactions?

Cr2​O72−​+2OH−→2CrO42−​+H2​O

2CrO42−​+2H+→Cr2​O72−​+H2​O

2MnO4−​+3Mn2++4OH−→5MnO2​+2H2​O

2Cu+→Cu+Cu2+

Correct answer is (c) 2MnO4−​+3Mn2++4OH−→5MnO2​+2H2​O Correct answer is (d) 2Cu+→Cu+Cu2+

$C r_{2} O_{7}^{2 -} + 2 O H^{-} \to 2 C r O_{4}^{2 -} + H_{2} O$

$2 C r O_{4}^{2 -} + 2 H^{+} \to C r_{2} O_{7}^{2 -} + H_{2} O$

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

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

Correct answer is (c) $2 M n O_{4}^{-} + 3 M n^{2 +} + 4 O H^{-} \to 5 M n O_{2} + 2 H_{2} O$ Correct answer is (d) $2 C u^{+} \to C u + C u^{2 +}$