CHEMISTRY · Single correct · CBSE · Chemistry · Metals and Non-metals · Metals and Non-metals
Problem
Which of the following statements is incorrect?
(1) Sodium and potassium are soft and silvery white metals
(2) Sodium and potassium in air get tarnished due to the formation of a layer of oxide or carbonates
(3) Sodium and potassium burn in dry oxygen (excess) giving peroxides
(4) Sodium and potassium are kept under kerosene to avoid the contact with air and moisture