Give reasons for the following : (i) Metal oxides generally react with acids. However, zinc oxide reacts even with sodium hydroxide. (ii) Heat of neutralisation value for the reaction of HCl and NH_(4)OH is less than 13.7 kcal/mol (iii) All indicators are not suitable for all titrations

Give reasons for the following : (i) Metal oxides generally react wit

1.	Give reasons for the following : (i) Metal oxides generally react with acids. However, zinc oxide reacts even with sodium hydroxide. (ii) Heat of neutralisation value for the reaction of HCl and NH_(4)OH is less than 13.7 kcal/mol (iii) All indicators are not suitable for all titrations
Answer» Solution :(i) Zinc oxide is amphoteric in nature. Hence, it can REACT both with acids as well as bases. (ii) `INH_(4) OH` is a weak BASE and hence, some heat is utilised to ionise the weak base (III) Indicator that undergoes COLOUR change in the pH range of the titration is only SUITABLE for a particular titrations