- No.6.Why H+ ion acts as a Lewis acid?
Answer. H+ has an electron accepting tendency therefore, it acts as Lewis acid. Such as
H++NH3 ——> NH4+
- No.7. Name two acids used in the manufacture of fertilizers.
Answer. Two acids used in manufacture of fertilizers are sulphuric
acid and nitric acid
- No.8.Define pH. What is the pH of pure water?
Answer. Negative logarithm of hydrogen ion concentration [H+] is called
pH = -log [H+]
The pH of pure water is 7.
Q.No.9.How many times a solution of pH I will be stronger than that of a solution having pH 2?
Answer. A solution of pH 1 has H+ concentration 0.1 M while that of pH 2 has H+ concentration 0.01 M. 0.1 M concentration is 10 times greater than that of 0.01 M. As strength of an acid depends upon the concentration of H+ ions therefore, a solution of pH 1 is 10 times stronger than that of a solution of pH 2.
- No.10. Define the followings:
- Normal salt ii. Basic salt
Normal salt: A salt formed by the total replacement of ionizable H+ ions of an acid by a positive metal ion or NH4+ ion is called normal or neutral salt.
HCl(aq) + KOH(aq) KCl(aq) + H2O(1)
Basic salt: A basic salt is formed by the incomplete neutralization of a polyhydroxy base by an acid.
Al (OH) 3(aq) + HCl(aq) ————— > Al(OH)2Cl(aq) + H2O(1)