A level Chem 1.1 Atomic Structure MCQs

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A student has a 10 cm3 sample of 1.00 × 10–2 mol dm–3 methanoic acid solution. The student is asked to dilute the methanoic acid solution to a concentration of 2.00 × 10^-4 mol dm³ by adding distilled water. Which volume of water should be added?

490cm³

Which atom has the greatest first ionisation energy?

He

Chlorine exists as two isotopes 35Cl and 37Cl in the ratio 3:1 Which statement about peaks in the mass spectrum of Cl2 is correct?

Peaks at m/z = 70, 72 and 74 in the ratio 9:6:1

Which of these has the highest first ionisation energy?

Cl

Bromine exists as two isotopes 79Br and 81Br, which are found in almost equal abundance. Which of the statements is correct?

The mass spectrum of C3H7Br has two molecular ion peaks at 122 and 124

Which of these atoms has the largest atomic radius?

Na