Oxidation and reduction

Question 1 of 10

In the reaction 2H₂S + SO₂ → 3S + 2H₂O, the oxidising agent is

Question 2 of 10

In Zn + CuSO₄ → ZnSO₄ + Cu, zinc is

Question 3 of 10

A reducing agent

Question 4 of 10

Which is the best oxidising agent?

Question 5 of 10

The oxidation number of chromium in K₂Cr₂O₇ is

Question 6 of 10

In electrolysis, reduction takes place at the

Question 7 of 10

In the reaction CuO + H₂ → Cu + H₂O, the reducing agent is

Question 8 of 10

Balance: Cr₂O₇²⁻ + Fe²⁺ → Cr³⁺ + Fe³⁺ (acid). The mole ratio Cr₂O₇²⁻ : Fe²⁺ is

Question 9 of 10

The standard electrode potential of zinc is −0.76 V and copper +0.34 V. The e.m.f. of a Daniell cell is

Question 10 of 10

The oxidation number of sulphur in H₂SO₄ is