1.

Name the ores of iron.

2.

What is Mohr's salt?

3.

Name the external indicator used in determination of ferrous content.

4.

What is IUPAC name of K ₃[Fe(CN) ₆]?

5.

What will happen if K ₃[Fe(CN) ₆] is used as an internal indicator in this titration?

6.

Write the chemical reactions involved in this reaction.

7.

Why is K ₂Cr ₂O ₇ used as an oxidizing agent only in the presence of acid?

8.

Why is H ₂SO ₄ added for preparing a standard solution of Mohr's salt?

9.

Why does K ₂Cr ₂O ₇ not act as a self-indicator?

10.

Name one external and one internal indicator used in K ₂Cr ₂O ₇ titration.

11.

Which is a more powerful oxidizing agent, KMnO ₄ or K ₂Cr ₂O ₇?

12.

What is the equivalent weight of K ₂Cr ₂O ₇?

13.

Which substance can be used as a self-indicator?

14.

Name one adsorption indicator.

15.

Give the equivalent weight of an oxidizing agent.

16.

What is the oxidation state of Cr in K ₂Cr ₂O ₇?

17.

Why should the K ₃[Fe(CN) ₆] indicator be freshly prepared?

18.

Give the formula of Mohr's salt.

19.

What is the deep blue colored compound formed in the experiment?

1.

Haematite (Fe ₂O