Post-UTME Chemistry 2008 Objective — Question 9
Question 9 of 10 from the Post-UTME Screening (Post-UTME) Chemistry 2008 Objective paper, with the correct answer and a full explanation.
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An element X forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is
- A. 34.0
- B. 31.0Correct
- C. 20.0
- D. 14.0
Explanation
Relative molecular mass=2×vapour density=34; mass of X = 34-3(H)=31.
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