MCQ
is:
- ✓
- B
- C
- D
✓
Answer
Correct option: A.
a
The complete reaction is shown below. (fig)
The complete reaction is shown below. (fig)
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The reaction of $K _3\left[ Fe ( CN )_6\right]$ with freshly prepared $FeSO _4$ solution produces a dark blue precipitate called Turnbull's blue. Reaction of $K _4\left[ Fe ( CN )_6\right]$ with the $FeSO _4$ solution in complete absence of air produces a white precipitate $X$, which turns blue in air. Mixing the $FeSO _4$ solution with $NaNO _3$, followed by a slow addition of concentrated $H _2 SO _4$ through the side of the test tube produces a brown ring.
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$(B)$ $Fe \left[ Fe ( CN )_6\right]$
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$(A)$ $\left[ Fe ( NO )_2\left( SO _4\right)_2\right]^{2-}$
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→| $p ( mm Hg )$ | $50$ | $100$ | $200$ | $400$ |
| Relative $t _{1 / 2}( s )$ | $4$ | $2$ | $1$ | $0.5$ |
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→$B$ is
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