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The following reactions are carried out ...

The following reactions are carried out in open vessels.
(P) `2Cu(s)+ O_2 (g)" " underset rightarrow (heat)" "2CuO(s)`
(Q) `Zn(s) +CuSO_4(aq) rightarrow ZnSO_4(aq) + Cu(s)`
(R) `2FeSO_4(s)" " underset rightarrow (heat)" " Fe_2 O_3(s) + SO_2(g) +SO_3(g)`
Which of the following correctly shows if the weight of the reaction vessel and contents increases, decreases or remains the same after the reaction as compared to before the reaction?

A

A

B

B

C

C

D

D

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