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JIPMER 2009
Exam
JIPMER
Year
2009
Subject
Chemistry
Chapter
Ionic Equilibrium

JIPMER 2009 · Chemistry · Ionic Equilibrium

Which of the following statement is correct?

Which of the following statement is correct?

Options

  1. AThe pH of one litre solution containing (0.49 \mathrm{~g}) of (\mathrm{H}_2 \mathrm{SO}_4) is 2.0
  2. BThe conjugate base of (\mathrm{H}_2 \mathrm{~S}) is (\mathrm{S}^{-2})
  3. C(\mathrm{BF}_3) is Lewis base
  4. DPhenolphthalein is colorless in basic medium

Correct answer

A. The pH of one litre solution containing (0.49 \mathrm{~g}) of (\mathrm{H}_2 \mathrm{SO}_4) is 2.0

Step-by-step solution

w=0.49 gE=49V=1000 mL∴N=w×1000E⋅V=0.49×100049×1000=0.01 N∴[H+]=0.01∴pH=−log⁡[H+]=−log⁡(1×10−2)=2\begin{aligned} & w=0.49 \mathrm{~g} \\ & E=49 \\ & V=1000 \mathrm{~mL} \\ & \therefore \quad N=\frac{w \times 1000}{E \cdot V}=\frac{0.49 \times 1000}{49 \times 1000}=0.01 \mathrm{~N} \\ & \begin{array}{ll}\therefore & {\left[\mathrm{H}^{+}\right]=0.01}\end{array} \\ & \therefore \quad \mathrm{pH}=-\log \left[\mathrm{H}^{+}\right] \\ & =-\log \left(1 \times 10^{-2}\right)=2 \\ & \end{aligned}
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