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Q.

Which of the following metal(s) catches fire in reaction with water?

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a

Sodium

b

Potassium

c

Magnesium

d

Both 1 and 2

answer is D.

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Detailed Solution

Both sodium and potassium catch fire in reaction with water.
The reaction of sodium and potassium is explosive and quickly catches fire. It is a very exothermic reaction when sodium and potassium combine with water. This is when metals like sodium and potassium are reacted with water; respective metal hydroxides are formed with the liberation of hydrogen gas. This hydrogen gas is highly inflammable and easily catches fire. Hence this is due to hydrogen gas; these metals, in reaction with cold water, easily catch fire and burn, producing yellow flames. The reactions can be represented as:

2 Na + H_{2} O \to 2 NaOH + H_{2}

2 K + H_{2} O \to 2 KOH + H_{2}

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Which of the following metal(s) catches fire in reaction with water?