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Q.

Which one of these is chemical change?

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a

Dissolving sugar in water

b

Dissolving powdery ash obtained on burning magnesium in water

c

Putting soft iron nails in boiling vegetable oil

d

Salt in seawater

answer is C.

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Detailed Solution

$2Mg + O_{2} \to 2 MgO (ash)$

$MgO + H_{2} O \to Mg {(OH)}_{2}$

The new substance of magnesium hydroxide formed when we burn MgO (ash) in $H_{2} O$ .

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