When pure aluminium metal is heated to red hot in the presence of nitrogen gas; the compound formed is?
A. Al2N B. Al2N2 C. AlN D. Al2N3 Correct Answer: Option C – AlN
The density of a certain gas is 1.98gdm−³ at s.t.p. What is the molecular mass of the gas?
A. 44.0 g B. 54.0 g C. 26.0 g D. 31.0 g Correct Answer: Option A – 44.0 g Explanation Density = mass/volume ∴ 1.98 = molecular mass/22.4 molecular mass = 1.98 X 22.4 = 44.35 ≅ 44.05What is the valence shell electron configuration of the element with atomic number 17?
A. 1s2 2s2 2p6 3s2 3p4 B. 1s2 2s2 2p6 3s2 3p5 C. 2s2 2p6 D. 3s2 3p5 Correct Answer: Option B – 1s2 2s2 2p6 3s2 3p5
Which combination of the below refers to the uses of radioactive isotopes?
I. Treatment of cancer II. Detection of leakages in water mains III. Detection of the ages of ancient tools IV. Preparation of drugs A. I and III B. I and II C. I, II and III D. I, II, III and IV Correct Answer: Option...Products
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