A) \[AgN{{O}_{3}}\]solution
B) \[Zn{{(N{{O}_{3}})}_{2}}\]solution
C) \[Ba{{(N{{O}_{3}})}_{2}}\]solution
D) \[NaN{{O}_{3}}\]solution
Correct Answer: A
Solution :
The element, placed above in electrochemical series, can replace the elements (placed below) from their solution. Here copper is placed only above silver (Ba, Zn and Na are placed above Cu). Hence, it can replace Ag from its salt solution. Thus, solution becomes blue due to\[C{{u}^{2+}}\]ions. \[Cu+2AgN{{O}_{3}}(aq)\to \underset{blue}{\mathop{Cu{{(N{{O}_{3}})}_{2}}(aq)}}\,+2Ag\]
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