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STD 11 - 6.2. Equilibrium - II (icon Equilibrium) — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 6.2. Equilibrium - II (icon Equilibrium)4 Marks
MCQ
Assuming complete dissociation, which of the following aqueous solutions will have the same $pH$ value
  • A
    $100 \,ml $ of $0.01\,\,M\,\,HCl$
  • B
    $100 \,ml $ of $0.01\,\,M\,\,{H_2}S{O_4}$
  • C
    Mixture of $50 \,ml$ of $0.02\,M\,H_2SO_4$ and $50\,ml$ of $0.02\,M\,NaOH$
  • ✓
    $(a)$ and $(c)$ both
✓

Answer

Correct option: D.
$(a)$ and $(c)$ both
(d) M.eq. of $0.01 $ $M\,\,HCl = \frac{{.01 \times 100}}{{1000}} = 1 \times {10^{ - 3}}$

$pH = 3$

M.eq. of $0 .02$  $M\,\,{H_2}S{O_4} = \frac{{.04 \times 50}}{{1000}} = 2 \times {10^{ - 3}}$

M.eq. of $0.02$ $M\,\,NaOH = \frac{{0.02 \times 50}}{{1000}} = 1 \times {10^{ - 3}}$

Left $[{H^ + }] = 2 \times {10^{ - 3}} - 1 \times {10^{ - 3}} = 1 \times {10^{ - 3}}$;$pH = 3$

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