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JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties

પાણીનું ઠારબિંદુ ઘટાડીને \(-0.2^{\circ} \mathrm{C} \) કરવા \(600\; \mathrm{g}\) પાણી \((\rho=1.00\; \mathrm{g} / \mathrm{mL})\) માં \(\mathrm{NaCl}\) નો કેટલો જથ્થો ઉમેરવો જોઇએ ? (પાણી માટે ઠારબિંદુ અવનયન અચળાંક \(=2\; \mathrm{K}\; \mathrm{kg} \;\mathrm{mol}^{-1}\))

  1. A \(2.25\)
  2. B \(2\)
  3. C \(1.75\)
  4. D \(1.5\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(1.75\)

Step-by-step Solution

Detailed explanation

\(\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{i} \times \mathrm{m} \times \mathrm{K}_{\mathrm{f}}\) \(0.2=2 \times 2 \times \frac{\mathrm{w} / 58.5}{600 / 1000}\) \(\mathrm{w}=1.755 \mathrm{gm}\)
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