An oxide XO2 has a vapour density of 32. What is the atomic mass of X?
A. 32 B. 20 C. 14 D. 12 Correct Answer: Option A – 32 Explanation XO2 → 32 * 2 X + 16 * 2 → 64 X = 64 – 32 =32
Cancerous growths are cured by exposure to?
A. γ – rays B. β – rays C. α – rays D. infrared rays Correct Answer: Option A = γ – rays
A particle that contains 9 protons; 10 neutrons and 10 electrons is a?
A. negative ion B. positive ion C. neutral atom of non-metal D. neutral atom of a metal Correct Answer: Option A – negative ion
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen? [H = 1, O = 16]
A. 36.0g B. 8.0g C. 72.0g D. 16.0g Correct Answer: Option C – 72.0g Explanation 2H2 + O2 → 2H2O 4 → 36 8 → X X → (8/6) * 36 = 72.0gProducts
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