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Attempt either subpart (a) or (b) :
OR
(b) Define the following terms with an example :
(i) Olfactory indicators
(ii) Water of crystallisation
(iii) Basic salt
OR
(b) Define the following terms with an example :
(i) Olfactory indicators
(ii) Water of crystallisation
(iii) Basic salt
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(b) (i)Substances whose odour changes in acidic or basic media. (½ Mark)
Example: Onion, vanilla, clove (any one) (½ Mark)
(ii)The fixed number of water molecules present in one formula unit of a salt. (½ Mark)
Example: $\ce{CuSO4 . 5H2O}$, $\ce{CaSO4 . 2H2O}$, $\ce{FeSO4.7H2O}$, $\ce{Na2CO3.10H2O}$ (any one or any other) (½ Mark)
(iii)The salt formed by reaction between strong base and weak acid. (½ Mark)
Example: $\ce{Na2CO3}$, $\ce{NaHCO3}$ (any one or any other) (½ Mark)
Example: Onion, vanilla, clove (any one) (½ Mark)
(ii)The fixed number of water molecules present in one formula unit of a salt. (½ Mark)
Example: $\ce{CuSO4 . 5H2O}$, $\ce{CaSO4 . 2H2O}$, $\ce{FeSO4.7H2O}$, $\ce{Na2CO3.10H2O}$ (any one or any other) (½ Mark)
(iii)The salt formed by reaction between strong base and weak acid. (½ Mark)
Example: $\ce{Na2CO3}$, $\ce{NaHCO3}$ (any one or any other) (½ Mark)