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নিম্নে উল্লেখিত কোন বিক্রিয়াটি বিজারণ নয় ?

C u O + H_{2} = C u + H_{2} O

H_{2} S + C l_{2} = S + 2 H C I

C l_{2} + H_{2} = 2 H C I

H g C l_{2} + H g = H g_{2} C l_{2}

ANSWER : 2

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