Which of the following is a redox reaction? HBr (aq) + KOH (aq) rightarrow H_2 O

Question

Which of the following is a redox reaction? HBr (aq) + KOH (aq) rightarrow H_2 O (l) + KBr (aq) SO_3 (g) + H_2 O (l) rightarrow H_2 SO_4 (aq) HBr (aq) + Na_2 S (aq) rightarrow NaBr (aq) + H_2 S (g) NH_4^+ (aq) + 2 O_2 (g) rightarrow H_2 O (l) + NO_3^- (aq) + 2 H^+ (aq) None of the above What is the reducing agent in the following reaction? Zn + 2 MnO_2 + 2 H_2 O rightarrow Zn(OH)_2 + 2 MnO(OH) Zn MnO_2 H_2 O Zn(OH)_2 MnO(OH) Which of the following statements is true? An oxidized species gains electrons A reducing agent gains electrons. An oxidizing agent gains electrons All of the above are true.

Explanation / Answer

Answer for 1st question is (d)

1st reaction is Acid Base nuetralization reaction

2nd reaction is addition Reaction

3rd reaction is double replacement

only 4th reaction is redox because in this NH4+ gains electron and O2 donates electron both reduction and oxidation is taking place

Answer for 2nd question is (a) Zn

Because Zn is going from a oxidation state of 0 to +2 losing its electrons

whereas Mn is going from a oxidation state of +2 to +3 gaining electrons

one which loses electron is reducing agent Hence zn is reducing agent

Answer for 3rd question is (c) an oxidizing agent gains electron

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