Metal which is soft and floats on water is _______ .
A
aluminium
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B
copper
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C
lead
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D
potassium
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E
iron
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F
lithium
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Solution
The correct option is F lithium Lithium is lightest elemental metal nearly half as dense as water, so it floats on the surface and ultimately disappears, giving off hydrogen gas and forming a colourless solution of lithium hydroxide.