Which of these metals cannot be used to prepare hydrogen by the action of an acid

A) sodium . B)iron. C) calcium. D) copper

Hydrogen may be prepared in the laboratory by the action of a metal on an acid.

(a) Which of the metals copper, zinc , magnesium or sodium would be the most suitable ?

(b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric would you choose ? Explain why you would not use the acids you reject.

(c) How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?

Name the following

1. A metal below iron but above copper in the activity series of metals which has no reaction with water.

2. A metal which cannot be used for the preparation of hydrogen using dilute acids.

3. The salt formed when aluminium reacts with potassium Hydroxide, during the preparation of hydrogen from alkalis.

4. A gaseous reducing agent which is basic in nature

5. A compound formed between hydrogen and an element group 17[VIIA] - period 3.

Lead cannot be used in preparation of hydrogen using dilute acids. Why?