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6. What's a common test for the Hydrogen Halides?
- Form a white precipitate of Barium Halide when Barium Nitrate is added to a solution
- Reacts with ammonia gas to form a dense white smoke of ammonium halide
- Turns damp red litmus blue, then beaches it white
- Turns Fehling's solution red
7. What is the trend in ionisation energy down group 2?
- It increases up to Calcium then drops sharply
- It increases due to the increased nuclear charge
- It decreases due to the replusion and number of quantum shells increasing
- It decreases due to the size of the metallic radius decreasing
8. Why is Mg (carbonate and nitrate) the least thermally stable of the G2 elements ?
- Magnesium has the smallest ionic radius as a 2+ cation so a greater polarising ability (more charge dense)
- Magnesium isn't the least thermally stable, Barium is.
- Magnesium forms radioactive carbonates and nitrates that are unstable and break down
- Magnesium has the largest nuclear charge so can most easily pull apart the electron cloud
9. What does Mg form on reaction with steam?
- MgO (s) + H2 (g)
- MgOH + H2
- Mg(OH)2
- It doesn't react as it is the least reactive of the group.
10. What is the definition of the first ionisation energy?
- The energy required to remove an electron from each atom in one mole of gaseous atoms
- The energy required to form an ion from one mole of atoms under standard conditions (100kPa and 298k)
- The energy required to remove an electron from an atom
- The energy required for one mole of atoms to attract one electron each in the gaseous state
11. What is disproportionation?
- When one element undergoes both reduction and oxidation in a reaction at the same time
- The action of a powerful reducing agent
- A property of halides which decreases in ability down the group
- When one atom both gains and looses electrons in a reaction
12. Caesium's flame colour is __(a)___ , Rubidium's is __(b)__ and Magnesium's is __(c)__
- (a) Blue/Violet (b) Red/Purple (c) No colour
- (a) Apple green (b) Lilac (c) No colour
- (a)Orange (b) Brick Red (c) White
- (a)Red (b) Yellow (c) Green
13. What is the trend in solubility of the sulfates and hydroxides?
- They are less soluble down the group
- Sulfates decreases down the group ; hydroxides increases
- They are more soluble down the group
- Hydroxides decreases down the group, Sulfates increases
14. Which of the following reactions could happen?
- I2 + MgF2 --> F2 + MgI2
- Cl2 + 2NaBr --> 2NaCl + Br2
- Br2 + 2KCl --> 2KBr + Cl2
- At2 + 2Cl- --> 2At- + Cl2
15. Group 1(Represented by X) decomposition of the nitrates is.... (except Li)
- 2XNO3 --> NO2 + XNO2
- 2X(NO3)2 --> 2XO + 4NO2 + O2
- 2XNO3 --> 2XNO2 + O2
- 4XNO3 --> 2X2O + 4NO2 + O2
16. What is the main interaction that determines the boiling point of the halogens?
- Permanent dipole forces between molecules
- London forces between molecules
- Covalent bonds within molecules
- Hydrogen bonds between molecules
17. Which of these is not a property that decreases down the halogen group?
- Reducing ability
- Electronegativity
- Oxidising power
- Reactivity
18. How does chlorine react with COLD AQUEOUS alkali?
- Cl2 + 2NaOH --> 2NaCl + H2O
- 3Cl2 + 6NaOH --> 5NaCl + NaClO3 + 3H2O
- Cl2 + 2NaOH --> NaCl + NaClO + H2O
- Cl2 + H2O --> HCl + HClO