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Question

নিম্নোক্ত কোনটি দ্বারা ফেনল থেকে পিকরিক এসিড প্রস্তুত করা হয়?

H N O_{3} . H_{2} S O_{4}

H_{2} S O_{4}, 30 ° - 100 ° C

D i l u t e H N O_{3}

C o n c e n t r a t e d H N O_{3}

ANSWER : 1

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