Neet Solved Paper 2015 Question 13
Question: Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at $ {25^{o}}C $ ?
Options:
A) $ CoCl _3.3NH _3 $
B) $ CoCl _3.,4NH _3 $
C) $ CoCl _3.5NH _3 $
D) $ CoCl _3.6NH _3 $
Show Answer
Answer:
Correct Answer: A
Solution:
$ [Co{{(NH _3)}_6}]Cl _3\to {{[Co{{(NH _3)}_6}]}^{3+}}+3C{l^{-}} $ $ [Co{{(NH _3)}_3}C{l_3}]\to [Co{{(NH _3)}_2}Cl _3] $ $ [Co{{(NH _3)}_4}C{l_2}]Cl\to {{[Co{{(NH _3)}_4}Cl _2]}^{+}}C{l^{-}} $ $ [Co{{(NH _3)}_5}Cl]Cl _2\to {{[Co{{(NH _3)}_5}Cl]}^{2+}}+2C{l^{-}} $
So, $ [Co{{(NH _3)}_3}Cl _3] $ does not ionize so does not give test for chloride ions.
