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JEE Advanced levelNumerical answerDifficulty 3 of 3mc162

250 mL of 0.20 M NaCl is mixed with 350 mL of 0.15 M (volumes additive, complete dissociation). Find the concentration of chloride ions in mmol/L, to the nearest integer.

Numerical answer type, answer in mmol/L, tolerance 1.

Answer: 258 mmol/L

Cl- from NaCl = 250 x 0.20 = 50 mmol. Cl- from = 350 x 0.15 x 2 = 105 mmol. Total 155 mmol in 600 mL, i.e. 258.3 mmol/L, nearest integer 258.
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