octstef

(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 decreases (rapidly, slowly, regularly) with regular decrease of temperature.
   (d) The anhydrous sodium carbonate can be used as a (an) (indicator, catalyst, primary standard)
   (e) Faraday’s laws express the (qualitative, quantitative, volumetric) results of electrolysis.
   (f) Oxidation number of sulphur in H2SO3 is ( +6,+4,-2) .
   (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
   (a) The substances with high melting points may be (molwcular, non molecular , either molecular or non molecular) substance.
   (b) Atomic mass can be measured by a(an) (ordinary, balance, spectrometer, mass spectrometer).
   (c) A symbol represents (a molecule, an atom , a formula ) .
   (d) The name of Fe2O3 is (iron (II) oxide, an atom , a formula