Group 7 Quiz
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5 questions, one answer each
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1. What is the colour and state of bromine at room temperature?
- A. Pale green/yellow gas
- B. Red-brown liquid
- C. Grey/purple-black solid
- D. Colourless liquid
2. What is the correct chemical test for chlorine gas?
- A. It relights a glowing splint
- B. It turns limewater cloudy
- C. It bleaches damp litmus paper white
- D. It produces a squeaky pop with a lit splint
3. What is the trend in reactivity down Group 7?
- A. Reactivity increases down the group
- B. Reactivity decreases down the group
- C. Reactivity stays constant
- D. Reactivity increases then decreases
4. Chlorine gas is bubbled through potassium iodide solution. What is observed and why?
- A. No reaction, because chlorine is less reactive than iodine
- B. The solution darkens as iodine is displaced, because chlorine is more reactive than iodine
- C. Hydrogen gas is released
- D. The solution turns green permanently with no further change
5. In the displacement reaction Cl2 + 2KI -> 2KCl + I2, which statement correctly identifies the redox changes?
- A. Chlorine is oxidised because it gains electrons
- B. Iodide ions are reduced because they lose electrons
- C. Chlorine is reduced (gains electrons) and iodide ions are oxidised (lose electrons)
- D. No electron transfer occurs in this reaction