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Which one of the following reaction involves oxidationreduction?
(a) H_2+Br_2→ 2 HBr
(b) NaBr+HCl→NaCl+HBr
(c) HBr+AgNO_3→AgBr+HNO_3
(d) 2 NaOH+H_2SO_4→Na_2SO_4+2 H_2O

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