Colourless solutions of the following four sa | vedclass

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(B) metal can displace another metal from its salt solution if it is more reactive (i.e.,has a higher oxidation potential or lower reduction potential

Vedclass · Accepted Answer

$AgNO_3$

Vedclass · Answer

(B) metal can displace another metal from its salt solution if it is more reactive (i.e.,has a higher oxidation potential or lower reduction potential) than the metal in the salt.According to the electrochemical series,$Cu$ is more reactive than $Ag$ but less reactive than $K$ and $Zn$.$(a)$ $Cu + KNO_3 ightarrow 	ext{No reaction}$$(b)$ $Cu + 2AgNO_3 ightarrow Cu(NO_3)_2 + 2Ag$. The formation of $Cu(NO_3)_2$ gives a blue colour to the solution.$(c)$ $Cu + Zn(NO_3)_2 ightarrow 	ext{No reaction}$$(d)$ $Cu + ZnSO_4 ightarrow 	ext{No reaction}$Therefore,only the $AgNO_3$ solution will turn blue due to the formation of $Cu^{2+}$ ions.

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn blue?

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