You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. Which of them will turn red litmus to blue?

An unknown gas quickly dissolves in water. This gaseous aqueous solution turns red litmus into the blue. This gas produces white flame with hydrogen chloride. This unknown gas is –

Which one of the following oxides shows both acidic and basic behaviour?

Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?

Bee sting leaves an acid which causes pain and irritation. The acid released is

The reaction between an acid and a base to give a salt and water is known as a ______________ reaction.