May/June 2026 Paper 22

2026 · 6 questions · 40 parts · 60 marks

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3(a)(i)Group 7 HalogensEasy1 mark

Separate samples of NaC

l

and NaBr are reacted with concentrated H

_{2}

_{4}

. Table 3.1 shows the observations for each reaction.

Table 3.1

reaction	compound	observations
1	NaC $l$	effervescence; steamy fumes that turn blue litmus paper red
2	NaBr	effervescence; steamy fumes initially that turn blue litmus paper red; brown vapour; pungent smelling gas

Write an equation for reaction 1.

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3(a)(ii)Acid Base Properties ReactionsMedium2 marks

Explain why reaction 1 is described as a Brønsted–Lowry acid–base reaction.

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3(b)Group 7 HalogensMedium3 marks

Identify the formula of each species responsible for the observations in reaction 2 (NaBr with concentrated H

_{2}

_{4}

steamy fumes

brown vapour

pungent smelling gas

3(c)Group 7 HalogensEasy1 mark

Explain why reaction 2 produces brown vapour.

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3(d)Group 7 HalogensMedium1 mark

Explain why a gas with a pungent smell is not produced in reaction 1 but is produced in reaction 2.

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