JEE Main 2014 · 9 Apr · Shift 1 · Chemistry Q45

ChemistrySingle correct+4 / -1Question 45 of 90

Which of the following is not formed when $\ce{H2S}$ reacts with acidic $\ce{K2Cr2O7}$ solution ?

\ce{CrSO4}

\ce{Cr2(SO4)3}

\ce{K2SO4}

Answer and worked solution

Official answer: A

$\ce{K2Cr2O7 + 3H2S + 4H2SO4 -> K2SO4 + Cr2(SO4)3 + 3S + 7H2O}.$
Chromium ends as Cr(III) in $\ce{Cr2(SO4)3}$ ; $\ce{CrSO4}$ (Cr(II)) is not formed.

JEE Main 2014 · 9 Apr · Shift 1, Chemistry question 45