a- (iv), b - (ii), c - (iii), d - (i)
a - (i), b- (iv), c- (ii), d- (iii)
a- (i), b- (ii), c- (iii), d- (iv)
a - (iv), b - (iii), c - (ii), d - (i)
(a) Sulphuric acid is manufactured by using the Contact process
(b) Steel is prepared by Bessemer's process
(c) Sodium hydroxide is prepared by the Leblanc process
(d) Ammonia is manufactured by Haber's process.