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