Why is option (d) the correct answer? please explain.

DEAR STUDENT,
Option d is correct, because  Electrovalent (ionic) compounds may not always contain oppositely charged ions, but sometimes only electrostatic attraction may exist. so, it is not necessary that ionic compounds will ionize when dissolved in water.
Regards,

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hiiii
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Positive ion of ionic compound attaches to the negative part of a polar solvent and negative ion of ionic compound attach with the positive part of the polar solvent. Therefore, ionic or electrovalent compounds are soluble in polar solvents like water and insoluble in non-polar solvents like benzene, ether, alcohol.
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Hiiiii guys
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Because electrovalent compound forms mobile ions when dissolved in aqueous solution.Mobile ions are free ions which conducts electricity
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