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NEET UG CHEMISTRY MCQ: SOLUTIONS

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Analyzing +4 | -1

20 \,\mathrm{mL}

of calcium hydroxide was consumed when it was reacted with

10 \,\mathrm{mL}

of unknown solution of

\mathrm{H}_{2} \mathrm{SO}_{4}

. Also

20 \,\mathrm{mL}

standard solution of

0.5 \,\mathrm{M} \,\mathrm{HCl}

containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of

35.5 \,\mathrm{mL}

whereas the burette showed

25.5 \,\mathrm{mL}

initially. The concentration of

\mathrm{H}_{2} \mathrm{SO}_{4}

is _____ M. (Nearest integer)

View answer and explanation

Correct option: A

1

The concentration of H2SO4 is 1 M. This is determined by first calculating the moles of Ca(OH)2 used to neutralize HCl, then subtracting that from the total moles of Ca(OH)2 used to neutralize both HCl and H2SO4, and finally calculating the concentration of H2SO4.

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