'X' metal is soft and can be easily cut with a knife. It catches fire when exposed to air and water and is also used in street lights. What is 'X'?

Sodium

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Mercury

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Calcium

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Lithium

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Solution

The correct option is A Sodium
Sodium is metallic element found in the first group of the periodic table. As the sixth most abundant element in the Earth's crust, sodium compounds are commonly found dissolved in the oceans, in minerals, and even in our bodies.
Pure sodium is not found naturally on earth because it is a highly reactive metal.

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