iii. An organic compound undergoes addition reactions and gives a red colour
precipitate with ammoniacal cuprous chloride. Therefore, the organic compound
could be
(A) Ethane
(B) Ethene
(C) Ethyne
(D) Ethanol

iv. An organic weak acid is
(A) Formic acid
(B) Sulphuric acid
(C) Nitric acid
(D) Hydrochloric acid

v. During ionisation, metals lose electrons; this change can be called
(A) Oxidation
(B) Reduction
(C) Redox
(D) Displacement

vi. Which one of the following is not true of metals?
(A) Metals are good conductors of electricity.
(B) Metals are malleable and ductile.
(C) Metals form non-polar covalent compounds.
(D) Metals will have 1 or 2 or 3 electrons in their valence shell.

vii. An example of a complex salt is
(A) Zinc sulphate
(B) Sodium hydrogen sulphate
(C) Iron (II) ammonium sulphate
(D) Tetrammine copper (II) sulphate

viii. Aqua regia is a mixture of
(A) Dilute hydrochloric acid and concentrated nitric acid
(B) Concentrated hydrochloric acid and dilute nitric acid
(C) Concentrated hydrochloric acid (1 part) and concentrated nitric acid (3 parts)
(D) Concentrated hydrochloric acid(3 parts) and concentrated nitric acid(1 part)

x. The number of electrons present in the valence shell of a halogen is
(A) 1
(B) 3
(C) 5
(D) 7

xi. The organic compound mixed with ethanol to make it spurious is
(A) Methanol
(B) Methanoic acid
(C) Methanol
(D) Ethanoic acid

State your observation for the following cases:

i. Moist blue litmus is introduced into a gas jar of sulphur dioxide.

ii. Dry red rose petals are placed in the jar of sulphur dioxide.

iii. Paper soaked in potassium permanganate solution is introduced into a gas jar of
sulphur dioxide.

iv. Ammonia gas is burnt in an atmosphere of oxygen in the absence of a catalyst.

v. A glass rod dipped in ammonium hydroxide is brought near the mouth of the
concentrated hydrochloric acid bottle.

Match the Column A with Column B:

Column A	Column B
(i) Sodium chloride	Increases
(ii) Ammonium ion	Covalent bond
(iii) Electronegativity across the period	Ionic bond
(iv) Non-metallic character down the group	Covalent and coordinate bond
(v) Carbon tetrachloride	Decreases

Answer as follows: