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?

  • Reactivity
  • Reducing ability
  • Oxidising power
  • Electronegativity

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