| Assertion: On cooling a freezing mixture, colour of the mixture turns to pink from deep blue for a reaction.\[Co({{H}_{2}}O){{_{6}^{2+}}_{(aq)}}+4C{{l}^{-}}_{(aq)}\]⇌ \[CoCl{{_{4}^{2-}}_{(aq)}}+6{{H}_{2}}{{O}_{(l)}}\]. |
| Reason: Reaction is endothermic so on cooling, the reaction moves to backward direction. |
| Read the assertion and reason carefully to mark the correct option out of the options given below: |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
[a] Both assertion and reason are true and reason is the correct explanation of assertion. \[CO({{H}_{2}}O)_{6}^{2+}\,\] (Pink) while \[CoCl_{4}^{2-}\](blue). So, on Cooling because of Le-chatelier?s principle the reaction tries to over come the effect of temperature.
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