(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.

Cl₂ + H₂S → 2HCl + S 

State whether the following conversion is oxidation or reduction:

PbO₂ + SO₂→ PbSO₄ 

State whether the following conversion is oxidation or reduction:

Cu²⁺ + 2 e^-→ Cu 

State whether the following conversion is oxidation or reduction:

K → K⁺ + e^- 

State whether the following conversion is oxidation or reduction:

2Cl^- - e^-→ Cl₂ 

In the following reaction: A⁺ + B → A + B⁺. Write half-reactions for this reaction and name:

1. oxidizing agent
2. substance oxidized
3. reducing agent 

Divide the following reactions into oxidation and reduction half-reaction:

Zn + Pb²⁺→ Pb + Zn ²⁺

Divide the following reactions into oxidation and reduction half-reaction:

Zn + Cu²⁺ → Cu + Zn ²⁺

Divide the following reactions into oxidation and reduction half-reaction:

Cl₂ + 2Br^- → Br₂ + 2Cl^-

Write the equation in the ionic form

CuSO4_(aq)  + Fe_(s)→ FeSO4_(aq) + Cu_(s)

Divide the above equation into oxidation and reduction half-reactions.

Reacting with water, an active metal produces

A metal oxide that is reduced by hydrogen is

Which of the following statements about hydrogen is incorrect?

For the reaction PbO + H₂→ Pb + H₂O, which of the following statements is wrong?

Choose terms from the options given in brackets to complete this sentence.

When CuO reacts with hydrogen,………………… is reduced and ……………….is oxidized to ………………….

(CuO, H₂, Cu, H₂O)

Name:

an oxidizing agent that does not contain oxygen.

Name: 

a substance that oxidizes concentrated HCl to chlorine.

Name:

a substance that will reduce aqueous Iron(III)ions to iron(II)ions.

Name: 

a liquid that is an oxidizing agent as well as a reducing agent.