As we go down in the electro-chemical series of metals, the reactivity ______ .
A
decreases and then increases
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B
increases and then decreases
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C
decreases
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D
increases
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Solution
The correct option is D decreases The higher the metal in the series, the more reactive it is and the more
vigorously it reacts with water, oxygen and acid. A metal in the
activity series can displace any metal below it in the series from its
compound. The elements potassium, sodium, lithium and calcium are very
reactive and they react with cold water to produce hydroxides and
hydrogen gas. . The metals above hydrogen are more reactive than
hydrogen. These metals can displace hydrogen from acids or water and
liberate hydrogen gas. The metals copper, silver gold and platinum are
less reactive than hydrogen and they do not replace hydrogen from water
or acid.