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Q)

Which of the following is a redox reaction ?


( A ) $NaCl + KNO_3 \to NaNO_3 + KCl$
( B ) $CaC_2O_4 + 2HCl \to CaCl_2 + H_2C_2O_4$
( C ) $2K[Ag(CN)_2] + Zn \to 2Ag + K_2[Zn(CN)_4]$
( D ) $Ca(OH)_2 + 2NH_4Cl \to CaCl_2 + 2NH_3 + 2H_2O$

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