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Q.

Which of the following is not correct?

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a

Na++Cl-⟶NaCl

b

Ca2++2 F-⟶CaF2

c

Na++F-⟶NaF

d

Ca2++2Na+⟶CaNa2

answer is D.

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Detailed Solution

Both Ca and Na are metals and form positive ions, which repel each other. Hence, the given reaction option (d) is not feasible.
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