four colourless salt solution are placed in seperate test tubes and a strip of copper is dipped in each. which solution finally turna blue?
a. Pb(NO3)2
b. AgNo3
c. Zn(NO3)2
d. Cd(NO3)2
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1
Answer:
Correct option is
B
AgNO
3
(a) Cu+Pb(NO
3
)
2
⟶×
(b) Cu+2AgNO
3
⟶Cu(NO
3
)
2
+2Ag
(c) Cu+Zn(NO
3
)
2
⟶×
(d) Cd(NO
3
)
2
+CO⟶×
Cu can reduce only Ag out of Pb,Ag,Zn,Cd.
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