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নিচের কোনটি নকল এ্যালাম?

C u S O_{4} F e_{2} (S O_{4})_{3} 24 H_{2} O

(N H_{4})_{2} S O_{4} F e_{2} (S O_{4})_{3} 24 H_{2} O

(N H_{4})_{3} S O_{4} C r_{2} (S O_{4})_{3} 24 H_{2}

K_{2} S O_{4} C r_{2} (S O_{4})_{3} 24 H_{2} O

ANS : 1

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