Which of the following statements is incorrect? (a) Sodium and pota...

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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
P carbonates
(c) Sodium and potassium burn in dry oxygen (excess) giving peroxides
W
(d) Sodium and potassium are kept under kerosene to avoid the contact with air and moisture
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