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

(a) sodium
(b) iron
(c) calcium
(d) copper

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

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

Q.

Why are the following metals not used in the lab. preparation of hydrogen ?

(a) calcium (b) iron (c) aluminium (d) sodium

Q. Which of these metals cannot displace hydrogen from a dilute acid?
(a) iron
(b) zinc
(c) silver
(d) calcium

Q. Which of the following methods, (a), (b), (c), (d) or (e) is generally used for preparing the chlorides listed below from (i) to (v). Answer by writing down the chloride and the letter pertaining to the corresponding method. Each letter is to be used only once.
(a) Action of an acid on a metal.
(b) Action of an acid on an oxide or carbonate.
(c) Direct combination.
(d) Neutralisation of an alkali by an acid.
(e) Precipitation (double decomposition).
(i) copper (II) chloride
(ii) iron (III) chloride)
(iii) iron (II) chloride
(iv) lead (II) chloride
(v) sodium chloride

Q.

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 ?