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(B) Depression in freezing point is a colligative property,which depends on the number of particles in the solution.$KCl \rightleftharpoons K^{+} + Cl

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sodium sulphate

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(B) Depression in freezing point is a colligative property,which depends on the number of particles in the solution.$KCl \rightleftharpoons K^{+} + Cl^{-}$ ($2$ particles)$Na_{2}SO_{4} \rightleftharpoons 2Na^{+} + SO_{4}^{2-}$ ($3$ particles)$MgSO_{4} \rightleftharpoons Mg^{2+} + SO_{4}^{2-}$ ($2$ particles)$MgCO_{3} \rightleftharpoons Mg^{2+} + CO_{3}^{2-}$ ($2$ particles)Since $Na_{2}SO_{4}$ produces the maximum number of particles ($3$ ions per formula unit),it causes the maximum depression in freezing point.

Maximum depression in freezing point is caused by

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