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A compound is formed by elements A and B. The crystalline cubic structure has the A atoms at the corners of the cube and B atoms at the body centre. The simplest formula of the compound is

1. AB
2. A6B
3. AB6
4. A6B4

Correct answer: AB

Solution

In a cubic structure, atoms at the corners contribute 1/8th each, so 8 corner A atoms contribute 1 atom. The body-centered B atom contributes fully as 1 atom. Thus, the ratio of A:B is 1:1, making the formula AB.

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