Q.

Sodium and potassium react with [[1]] water to form metal hydroxide and hydrogen.

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answer is COLD.

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Detailed Solution

Some metals react with cold water, some react with hot water and some react only with steam. Metals reacting with hot and cold water forms metal hydroxide and hydrogen. Sodium and potassium react with cold water to form metal hydroxide and water:

  1. 2K+ 2H2O →2KOH+ H2+heat
  2. 2Na+2H2O →2NaOH+ H2+heat
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