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NEET levelSingle correct optionDifficulty 1 of 3rx068

Which of the following is a disproportionation reaction?

A $2 Na + Cl X_{2} 2 NaCl$
B $CaO + CO X_{2} CaCO X_{3}$
C $2 H X_{2} O X_{2} 2 H X_{2} O + O X_{2}$
D $Zn + H X_{2} SO X_{4} ZnSO X_{4} + H X_{2}$

Answer: C

In disproportionation the same element is both oxidised and reduced. In

2 H X_{2} O X_{2} 2 H X_{2} O + O X_{2}

, O goes from -1 to -2 (reduced) and from -1 to 0 (oxidised). In the other reactions different elements change oxidation state or none does.

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