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characteristic ………. smell.
(d) Hydrogen sulphide has weak ………. properties.
(e) Halogens have essential electronic structure of ………. .
(f) In the reaction with ammonia, boron trifluoride behave as an ………. .
(g) The IUPAC name of di-methyl methylene is ………. .

1. Select the correct word(s) given in the bracket. (7 marks)
   (a) Proteins is ( polymer, copolymer, monomer).
   (b) The molecule of (NH3, ClF3, BCl3) does not deviate octet rule.
   (c) The volume of the gas d(g) Light is a source of (force, pressure, energy).
2. Match each of the items in List A with the appropriate items in the list B. (7 marks)
   List A List B
   (a) Neutralization (i) it dissolves in noble metal gold
   (b) Alum (ii) CaO Cl2.2 H2O
   (c) Ammonium iron (II