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Which of the following statement is correct ?

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the number of electrons present in the valence shell of S in ${SF}_{6}$ is 12

the rates of ionic reactions are very slow

according to VSEPR theory, ${SnCl}_{2}$ is a linear molecule

correct order of ability to form ionic compounds is ${Al}^{3 +} > {Mg}^{2 +} > {Na}^{+}$

answer is A.

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Detailed Solution

(A) in SF₆ forms 6 covalent bonds and has no lone pair. Thus, it has 12 valence electrons.

(B) Ionic reactions are very fast.

(D) Ionic mobility is inversely proportional to size so the orders would be.
${Al}^{+ 3} > {Mg}^{+ 2} > {Na}^{+}$

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