JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
In basic medium \(CrO _{4}^{2-}\) oxidises \(S _{2} O _{3}^{2-}\) to form \(SO _{4}^{2-}\) and itself changes into \(Cr ( OH )_{4}^{-}\). The volume of \(0.154\, M CrO _{4}^{2-}\) required to react with \(40\, mL\) of \(0.25\, M S _{2} O _{3}^{2-}\) is ........... \(mL\) (Rounded-off to the nearest integer)
- A \(170\)
- B \(173\)
- C \(181\)
- D \(141\)
Answer & Solution
Correct Answer
(B) \(173\)
Step-by-step Solution
Detailed explanation
\(gm\) equi. of \(CrO _{4}^{2-}= S _{2} O _{3}^{2-}\) \(0.154 \times 3 \times v =0.25 \times 40 \times 8\) \(v =173.16=173 \,ml\)
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