Which of the following statements is incorrect?
- ASodium and potassium are soft and silvery-white metals.
- BSodium and potassium in air get tarnished due to the formation of a layer of oxide or carbonates.
- CSodium and potassium burn in dry oxygen (excess) giving peroxides.
- DSodium and potassium are kept under kerosene to avoid contact with air and moisture.
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