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Category: Chemistry MCQs Class 9

Chemistry solved multiple choice questions (MCQs) for class 9 with answers.

Which of the following isotopes of the uranium is used in nuclear reactors and atomic bombs?

(A) 234U
(B) 235U
(C) 236U
(D) 238U

Answer: (B) 235U

Atomic masses of H and O are 1 amu and 16 amu respectively. The molecular mass of hydrogen peroxide, (H2 O2 )is:

(A) 32 amu
(B) 18 amu
(C) 17 amu
(D) 34 amu

Answer: (D) 34 amu

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