Identify the following : [5 MARKS]
(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

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Solution

Each Part: 1 Mark

(a) Copper(II) Oxide on reaction with HCl gives blue coloured solution of copper (II) chloride.
$C u O (s) + 2 H C l (a q) \to C u C l_{2} (a q) + H_{2} O (l)$

(b) $H C l$ and $N H_{3}$ are the colourless gases which when mixed produce a white solid $N H_{4} C l$ at room temperature.
$N H_{3} (g) + H C l (g) \to N H_{4} C l$

(c) HCl is formed by the combination of hydrogen gas and chlorine gas.
$H_{2} (g) + C I_{2} (g) \to 2 H C I (g)$

(d) Silver chloride is soluble in excess of ammonium hydroxide.
$A g C l (s) + 2 N H_{4} O H (a q) \to [A g (N H_{3})_{2}] C l$

(e) Gold can easily be dissolved in aqua regia. Aqua regia is a mixture of 3 parts conc. HCl and 1 part conc. $H N O_{3}$

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Similar questions

Name
(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) Name two gases which combine chemically to form a solid.
(b) Name a chloride which is soluble in excess of ammonium hydroxide.
(c) How will you show that hydrochloric acid contains both hydrogen and chlorine (other than by electrolysis)?
(d) Complete and balance the following equations:
KMnO₄ + HCl $\overset{}{\to}$ _______ + _______ + ________ + 8H ₂O

Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride

(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. Name
(a) a metallic hydroxide soluble in excess of NH₄OH.
(b) a metallic oxide soluble in excess of caustic soda solution.
(c) a strong alkali
(d) a weak alkali
(e) two coloured metal ions.
(f) two bases which are not alkalis but dissolve in strong alkalis.
(g) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

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