Name: (b) Two colourless gases, which when mixed produce a white solid.

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Solution

Hydrogen chloride and ammonia are two colourless gases which when mixed produced a white solid,ammonium chloride.

Reaction involved:
$H C L + N H_{3} \to N H_{4} C I (w h i t e s o l i d)$

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(a) a black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases, which when mixed produce a white solid.
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved.
(f) the experiment which demonstrates that hydrogen chloride is soluble in water.
(g) the gas produced when chlorine water is exposed to sunlight.

Name the following:
(i) Acid present in the stomach of mammals.
(ii) Drying agent used to dry hydrogen chloride.
(iii) Salt obtained by heating sodium chloride with concentrated sulphuric acid below 200 degree celsius.
(iv) Gas that yields dense white fumes when mixed with hydrogen chloride.
(v) Two solution that yield white precipitates, when treated with hydrogen chloride or hydrochloric acid.
(vi) Gas obtained by treating metals with hydrochloric acid.
(vii) Gas obtained by treating ferrous sulphide with hydrochloric acid.
(viii) Five oxidizing agents that liberate chlorine from concentrated hydrochloric acid.
(ix) Acid used to extract glue from bones.
(x) A chloride which is soluble in excess of ammonium hydroxide.
(xi) A greenish yellow gas.
(xii) A chemical in which gold can be dissolved.
(xiii) A metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(xiv) Two colourless gases which when mixed produce a white solid.

(a) Of the two gases ammonia and hydrogen chloride, which is more dense. name the method of collection of this gas.
(b) Give one example of a reaction between the above two gases which produces a solid compound.

Q. The following are two reaction schemes involving Mg.

Scheme-I : Mg