Question

Which of the following is not a redox reaction? A) 2KClO3 -------> 2KCl + 3O2 B)...

Which of the following is not a redox reaction?

A) 2KClO3 -------> 2KCl + 3O2

B) HgCl2 + Zn -------> ZnCl2 + Hg

C) Cu + O2 --------> CuO

D) AgNO3 + NaCl --------> AgCl + NaNO3

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Answer #1

answer : D) AgNO3 + NaCl --------> AgCl + NaNO3

D ) is not redox reaction

because Ag oxidation state in reactants and products = +1

Cl oxidation state in reactants and products   = -1

Na oxidation state in reactants and products = +1

NO3 oxidation state in reactants and products = -1

so there is no change in oxidation state

remaining are correct:

KClO3 -------------------> KCl + O2

Cl oxidation state changes from +5 to -1 it is reduction . gain of electrons

O oxidation state chnages from -2 to 0 . it is oxidation . loss of electrons

B)

Hg+2 -------------------Hg reduction

Zn-------------------> Zn+2 oxidation

C)

Cu-----------------Cu+2   oxidation

O2 ----------------> O-2 redcution

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