Problem: 15. Which of the following reactions is/are redox reactions?(1) K2CrO4 + BaCl2 → BaCrO4 + 2KCl(2) Ag+ + Br− → AgBr(3) Cu + S → CuS      A) only reaction (1)     B) only reaction (2)     C) only reaction (3)             D) both reactions (1) and (3)            E) both reactions (2) and (3)

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15. Which of the following reactions is/are redox reactions?

(1) K2CrO4 + BaCl2 → BaCrO4 + 2KCl

(2) Ag+ + Br → AgBr

(3) Cu + S → CuS      

A) only reaction (1)     

B) only reaction (2)     

C) only reaction (3)             

D) both reactions (1) and (3)            

E) both reactions (2) and (3)

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