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A student takes $$CuSO_4$$ solution in four test labelled 1, 2, 3, 4. Add Mg, Zn, Cu, Fe metals in tubes 1, 2, 3, 4, respectively and observed that in tube 1, 2 blue solution becomes colourless. In tube 4 blue solution changes to pale green. Now he repeats the experiment with $$ZnSO_4$$ solution in tube 1 he observes solution becomes colourless and greyish Zn can deposited and no reaction in tube 2, 3, 4. He repeats the experiment with $$AgNO_3$$ solution in tube 1, 2 he observes the colourless solution and Ag metal deposited. In tube 3 blue solution Ag metal gets deposited and in tube 4, pale green solution Ag metal gets deposited. Now answer the following questions :
He observe colourless solution correspond to following reactions -

A
$$Mg+CuSO_4\rightarrow MgSO_4+Cu$$
B
$$Mg+ZnSO_4\rightarrow MgSO_4+Zn$$
C
$$Mg=2AGNO_3\rightarrow Mg(NO_3)_2+Ag$$
D
All of these
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Correct option is D. All of these

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