1. Which is the most electronegative element of Group 7?
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Other questions in this quiz
2. How are the hydrogen halides best described?
- Green/brown/violet vapours
- Alkaline acids that turn damp red litmus paper blue
- Misty white fumes
- Dense white smoke
3. Why is Mg (carbonate and nitrate) the least thermally stable of the G2 elements ?
- Magnesium has the largest nuclear charge so can most easily pull apart the electron cloud
- Magnesium has the smallest ionic radius as a 2+ cation so a greater polarising ability (more charge dense)
- Magnesium forms radioactive carbonates and nitrates that are unstable and break down
- Magnesium isn't the least thermally stable, Barium is.
4. What would you expect to observe when NaI reacts with H2SO4 ?
- White crystalline solid of NaSO4 , Purple fumes of I2 , A gas that would relight a splint (O2) and dense white fumes of HI
- Misty fumes of HI and the residue of NaHSO4 only - it is the poorest recuder
- Misty fumes of HI ; Purple fumes/black solid of I2 ; Choking gas of SO2 ; Yellow solid of S ; Eggy gas of H2S
- Brown fumes /orange liquid ; Choking gas
5. Which of these is not a property that decreases down the halogen group?
- Reducing ability
- Oxidising power