Reactivity series from displacement reactions

Steps:

• In the first equation, Cu displaces Q from Q(NO₃)₂, so Cu is more reactive than Q.
• Cu is below hydrogen in the reactivity series, so Q is less reactive than hydrogen.
• In the second equation, T displaces hydrogen from H₂SO₄, so T is more reactive than hydrogen.
• R is not mentioned in either equation, providing no data on its reactivity relative to Q or T.

Not enough information.

Why C is correct:

• Insufficient details on R prevent confirming any order, including R > T > Q.

Why the others are wrong:

• A: No evidence Q > T or Q > R.
• B: No evidence Q > R or R > T.
• D: No evidence T > R or R > Q.

Final answer: Not enough information.