Potassium burns in water with a __________ flame.

lilac

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blue

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red

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brown

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Solution

The correct option is B lilac
Potassium burns with a lilac flame.
It is soft alkali metal that oxidizes rapidly in air and is very reactive with water generating sufficient heat to ignite the hydrogen emitted in the reaction.

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When potassium reacts with cold water then hydrogen gas burns with a _____ coloured flame.

Translate the following statements into chemical equations and then balance them.

(a) Hydrogen gas combines with nitrogen to form ammonia.

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(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

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