Question

Fill in the blanks:

(a) Aqua regia is a mixture of 3 parts ------------ and one part ------------.

(b) The catalytic oxidation of ammonia to nitric oxide is ------------. (exothermic/endothermic) process.

(c) Magnesium gives ------------(O2, H2, NO) with very dilute nitric acid.

(d) ------------ (iron / copper) become passive in concentrated nitric acid

Answer 1

(a) Aqua regia is a mixture of 3 parts Hydrochloric acid and one part Nitric acid.

(b) The catalytic oxidation of ammonia to nitric oxide is exothermic.

(c) Magnesium gives H2 with very dilute nitric acid.

(d) Iron become passive in concentrated nitric acid