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Hello, hi students.
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Let me explain you the question here they have given some of the elements among the elements given below which is most reactive in water, most reactive in water.
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So here they have given sodium, rubidium, ccum, lithium, lithium, potassium.
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So we know that.
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So coming to the solution, we know that the first group elements, the first group elements, they react with water, they react with water to produce metal hydroxide, metal hydroxide and hydrogen gas and hydrogen gas.
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So that means first group elements, these first group elements, they react with water and they form metal hydroxide and hydrogen gas.
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So the reaction here it is, for example, two sodium plus two water...