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Question

H_{2} S O_{4} + K_{2} C r_{2} O_{7} + K I

এর বিক্রিয়ায় প্রধান উতপাদনটি হল-

K_{2} S O_{4}

C r_{2} {(S O_{4})}_{3}

I_{2}

C r I_{3}

C r_{2} O_{3}

ANS : 3

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