A 42.12% (w/v) solution of 1L NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol for 2 hours is [Given: Molar mass: Na = 23.0 g mol ; Cl = 35.5 g mol ] –

Question

A 42.12% (w/v) solution of 1L NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol for 2 hours is [Given: Molar mass: Na = 23.0 g mol ; Cl = 35.5 g mol ] –1 –1 –1 –1 –1 –1 3 –1

(A) 36 mmol L
(B) 36 mol L
(C) 1440 mol L
(D) 1440 mmol L

Prashant Kotian · Accepted Answer

Correct answer: D) 1440 MMOL L. 42.12% (%w/v) NaCl solution means 42.12 g NaCl is present in 100 mL solution In 1 L, 421.2 g NaCl will be present Number of millimoles of NaCl = = 7.2 × 10 m moles = 7200 m moles Coagulation value for 10 hours = = 7200 Coagulation value for 2 hours = = 1440 mmoles L

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