Which is more dangerous: Sulphuric acid or Hydrochloric acid?
An acid which can decolourise purple coloured potassium permanganate solution is :
(a) sulphuric acid (b) citric acid
(c) carbonic acid (d) hydrochloric acid
Give reason for the following :
(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.
(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.