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Oxides and Oxoanions

Which of the ...

Question

Which of the following is the correct order of chemical reactivity with water according to electrochemical series ?

K > M g > Z n > C u

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K > M g > C u > Z n

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C u > Z n > K > M g

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M g > K > C u > Z n

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Solution

The correct option is C $K > M g > Z n > C u$
The correct order for the chemical reactivity with water is $K > M g > Z n > C u$ . This is because, among the given metals, potassium has the most negative standard reduction potential and copper has the highest standard reduction potential.

Metal
$K$ $M g$

$Z n$ $C u$

Standard reduction
potential (V)
$- 2.95$ $- 2.363$
$- 1.662$ $+ 0.340$

Option A is correct.

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Metal	$K$ $M g$		$Z n$ $C u$
Standard reduction potential (V)	$- 2.95$ $- 2.363$		$- 1.662$ $+ 0.340$