Group 7: the halogens Quiz
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5 questions, one answer each
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1. Which halogen is a liquid at room temperature?
- A. Chlorine
- B. Bromine
- C. Iodine
- D. Fluorine
2. Why does the boiling temperature of the halogens increase down the group?
- A. The covalent bond gets stronger
- B. The molecules become more polar
- C. Electronegativity increases
- D. The molecules have more electrons, so London forces are stronger
3. Chlorine water is added to potassium bromide solution and cyclohexane. What is seen in the organic layer?
- A. Violet colour
- B. Colourless with no change
- C. Orange colour
- D. Pale green only
4. In Cl₂ + 2NaOH → NaCl + NaClO + H₂O, the oxidation numbers of chlorine in the products are:
- A. −1 and +1
- B. −1 and +5
- C. +1 and +5
- D. −1 only
5. Which prediction about astatine is most reasonable?
- A. A pale green gas
- B. A liquid at room temperature
- C. A weaker oxidising agent than iodine
- D. A stronger oxidising agent than chlorine