sblock Elements - Result Question 66
####19. Anhydrous $MgCl _2$ is obtained by heating the hydrated salt with ……
(1980, 1M)
True/False
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Answer:
Correct Answer: 19. dry $HCl$
Solution:
- Both reactions in their complete format are written below
(i) In acidic medium,
$\left[Fe^{2+}(CN) _6\right]^{4-}+H _2 \stackrel{-1}{2} _2+2 H^{+} \longrightarrow\left[Fe^{3+}(CN) _6\right]^{3-}+2 H _2 \stackrel{-2}{O}$
(ii) In alkaline medium,
$$ \left[Fe^{3+}(CN) _6\right]^{3-}+H _2 O _2^{-1}+2 OH^{-} \longrightarrow \underset{ }{\left[Fe^{2+}(CN) _6\right]^{4-}+O _2+2 H _2 O} $$
Hence, $H _2 O$ (for reaction (i)) and $O _2+H _2 O$
(for reaction (ii)) are produced as by product.
