In case of reaction between sodium and cold water, hydrogen burns with ___ flame, whereas, in case of reaction between potassium and cold water, hydrogen burns with _ color.

Yellow, lilac

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Orange, yellow

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Orange, lilac

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Lilac, yellow

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Solution

The correct option is A Orange, lilac
When sodium is added to water, the sodium melts to form a ball that moves around on the surface. It fizzes rapidly, and the hydrogen produced may burn with an orange flame before the sodium disappears.When potassium is added to water, the metal melts and floats. The hydrogen ignites instantly. The metal is also set on fire, with sparks and a lilac flame.

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Similar questions

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

Sodium reacts with cold water to form a compound that burns with a flame. Guess the colour of flame.

Assertion:- Sodium metal reacts violently with water and burns with a yellow flame.

Reason:- A large amount of heat is generated and hydrogen evolved immediately catches fire.

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