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Question
Which of the following alkali metals reacts least vigorously with water?
Which of the following alkali metals reacts least vigorously with water?
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Solution
The correct option is D Li
Alkali metals react vigorously with water to form hydroxides and dihydrogen. This reactivity increases as we move down in a group.
Lithium's density is only about half that of water so it floats on the surface, gently fizzing and giving off hydrogen. It gradually reacts and disappears, forming a colourless solution of lithium hydroxide. The reaction generates heat too slowly and lithium's melting point is too high for it to melt.
Alkali metals react vigorously with water to form hydroxides and dihydrogen. This reactivity increases as we move down in a group.
Lithium's density is only about half that of water so it floats on the surface, gently fizzing and giving off hydrogen. It gradually reacts and disappears, forming a colourless solution of lithium hydroxide. The reaction generates heat too slowly and lithium's melting point is too high for it to melt.
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