Transition and InnerTransition Elements - Result Question 152
####52. Statement I To a solution of potassium chromate if a strong acid is added, it changes its colour from yellow to orange.
Statement II The colour change is due to the change in oxidation state of potassium chromate.
(1988, 2M)
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Answer:
Correct Answer: 52. (c)
Solution:
- Statement $I$ is true but Statement II is false :
$$ \underset{\text { Yellow }}{K _2 CrO _4}+H _2 SO _4 \longrightarrow \underset{\text { Orange }}{K _2 Cr _2 O _7}+K _2 SO _4+H _2 O $$
In both $K _2 CrO _4$ and $K _2 Cr _2 O _7$, chromium is in +6 oxidation state.
