_________ acid should not be used to prepare hydrogen.
Nitric acid should not be used in the laboratory preparation of hydrogen.
Give reason Sodium, potassium or calcium should not be used to prepare hydrogen from acids.
Give reason Lead is not used to prepare hydrogen from acids.
Explain why
(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(b) Nitric acid is kept in a reagent bottle for a long time.
Name the acid which should not be used for the preparation of hydrogen.