Case-Based-III: Most of metals undergo same kind of reactions. The ease with which they react is...

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Case-Based-III: Most of metals undergo same kind of reactions. The ease with which they react is not the same. Some are more reactive than the others metals. Metals along with hydrogen (a non-metal) are arranged in order of their reactivity in a series known reactivity series.
Which of the following metal is considered most reactive?
a. Sodium
b. Potassium
c. Zinc
d. Magnesium
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