Diameter of an atom is in the order of
Correct answer C. 0.2nm
Tip: press A, B, C or D to answer, and N for the next question.
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See allA sample of polyethene has an average molar mass of 28 000 g mol⁻¹. What is its average degree of polymerisation (C = 12, H = 1)?
Correct answer A. 1000
A PVC sample has an average molar mass of 125 000 g mol⁻¹. How many monomer units does an average chain contain (C = 12, H = 1, Cl = 35.5)?
Correct answer D. 2000
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Which reagent liberates CO₂ with ethanoic acid but not with phenol?
Correct answer C. Sodium hydrogencarbonate solution
Methylmagnesium bromide reacts with carbon dioxide, and the product is hydrolysed with dilute acid. What is formed?
Correct answer A. Ethanoic acid
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