(C) Sodium $(Na)$ burns in dry oxygen (excess) to form peroxide $(Na_2O_2)$.Potassium $(K)$ burns in dry oxygen (excess) to form superoxide $(KO_2)$.S

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Sodium and potassium burn in dry oxygen (excess) giving peroxides.

(C) Sodium $(Na)$ burns in dry oxygen (excess) to form peroxide $(Na_2O_2)$.Potassium $(K)$ burns in dry oxygen (excess) to form superoxide $(KO_2)$.Since the statement claims both form peroxides,it is incorrect.Therefore,option $C$ is the correct answer.

Class 11 Chemistry s-Block Elements Alkali metals

Difficult

Which of the following statements is incorrect?

A
Sodium and potassium are soft and silvery-white metals.
B
Sodium and potassium in air get tarnished due to the formation of a layer of oxide or carbonates.
C
Sodium and potassium burn in dry oxygen (excess) giving peroxides.
D
Sodium and potassium are kept under kerosene to avoid contact with air and moisture.