Which of the following gases are obtained during the electrolysis of acidified water?

Which of the following is not a metal?

Analyse the given table and choose the correct option. (Substance P turns blue litmus red, no change to red litmus; Substance Q no change to blue litmus, turns red litmus blue; Substance R causes no change to either litmus.)

Analyse the statements: Statement I - An atom is the smallest particle in an element that has the properties of the element. Statement II - Molecules are formed by the combination of two or more atoms. Select the correct option:

Which of the following substance can be used to test the presence of carbon dioxide in exhaled air?