SECTION (A)
(Answer ALL questions)
l. Write TRUE or FALSE for each of the following statements.
(a) The alkali metals have lowest electron affnity.
(b) The force acting on the unit area is the gas pressure.
(c) Molarity means mol cm-3
(d) Electrolytes are covalent compounds.
(e) Every oxidation must be -accompanied by a corresponding reduction.
(O Reversible reactions can proceed in the forward direction only. (g) All heats of neutralimtion are found to be endothermic. (7 marks)
- Fill in the blanks with the correct word(s), phrase(s), term(s), unit(s), etc., as necessary. (7 marks)
(a) Sodium dissolves in mercury to form sodiurn
(b) Wrought iron is the form of industrial iron.
(c) Nitrogen is obtained in industry by the distillatior ofliquid air.
(d) Hydrogen sulphide turns lead (Il) nitrate paper
(c) Chlorine is very if inhaled even in small quantities-
(f) A molecule that has both protophilic and protogcnic properties is called — molecule.
(g) Methane is useful for heating and cooking, and the solid residue is used as
- Select the correct word(s), notation(s), term(s), unit(s), etc., given (7 mar in the brackets.
(a) CH3-CHz-Cl; CH3COOH)
(b) In general the size of an atom [increases; decreases; does not change) down in gro (e) Absolute zero temperature is [ OOC ; + 1730C ; • 2730C J.
(d) Molar mass is the relative molecular mass expressed in [g mor t ; g mmorl ; mg mol-I (e) Anode is [ source of electron ; electron acceptor ; electroa donor l.
(0 Reduction is (gain; loss; donor] ofelectrons.
(g) A negative catalyst is a substance which [stops; decreases; increases) the rate of reaction.