Neet Solved Paper 2015 Question 7
Question: Which of the following processes does not involve oxidation of iron?
Options:
A) Rusting of iron sheets
B) Decolourisation of blue $ CuSO _4 $ solution by iron
C) Formation of $ Fe{{(CO)} _5} $ from Fe
D) Liberation of Hg from steam by iron a high temperature
Show Answer
Answer:
Correct Answer: C
Solution:
(a) $ \overset{0}{\mathop{Fe}},+\underbrace{H _2O+O _2} _{fromair}\xrightarrow{,}\overset{III}{\mathop{Fe _2}},O _3.xH _2O] $
(b) $ \overset{0}{\mathop{Fe}},+CuSO _4\xrightarrow{,}\overset{III}{\mathop{Fe}},SO _4+Cu $
(c) $ \overset{0}{\mathop{Fe}},+5CO\xrightarrow{,}\overset{0}{\mathop{Fe}},{{( CO )}_5} $
(d) $ \overset{0}{\mathop{Fe}},+\underset{Steam}{\mathop{H _2O}},\xrightarrow{,}\overset{III}{\mathop{Fe}},O _3+H _2 $
$ \therefore $ Formation of $ Fe{{( CO )}_5} $ from Fe does not involve oxidation of iron because there is no change in oxidation state.
