If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
(a) Wash the hand with saline solution
(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate
(c) After washing with plenty of water apply a solution of sodium hydroxide on the hand
(d) Neutralise the acid with a strong alkali

Correct Answer: (b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate 

Explanation: Washing the affected hand with plenty of water will reduce the concentration of the acid. The remaining traces of the acid can be neutralized by applying a paste of Hydrogen carbonate which is basic in nature.

[Note: NaOH is not used because it is corrosive in nature.]