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6. What is a precipitation reaction?

  • When electrons are removed from an atom.
  • When a carbonate is heated to produce a metal oxide and carbon dioxide gas.
  • The formation of a solid from a solution during a chemical reaction.
  • When a more reactive halogen displaces a less reactive halogen in a compound.

7. In a displacement reaction, in the order of Cl2, Br2 and I2, what are the colour of the halogens in cyclohexane?

  • Pale-green, Brown, Violet
  • Orange, Pale-green, Violet
  • Pale-green, Orange, Violet
  • Pale-green, Orange, Brown

8. Which statement is true?

  • The Halogens have high melting and boiling points which decrease down the group
  • The Halogens have low melting and boiling points which decrease down the group.
  • The Halogens have low melting and boiling points which increase down the group.
  • The Halogens have high melting and boiling points which increase down the group.

9. What are the strucural properties of a Group 7 element?

  • Simple molecular; Weak van der Waals' forces between diatomic molecules.
  • Metallic, Strong van der Waals' forces between diatomic molecules.
  • Giant covalent; Weak van der Waals' forces between diatomic molecules.
  • Giant ionic, Strong van der Waals' forces between diatomic molecules.

10. What is meant by the 'oxidising power' of a Halogen?

  • The ease of a Halogen atom to lose its outer electrons.
  • A measure of the strength with which a halogen atom is able to attract and capture an electron to form a halide.
  • A measure of the strength between the outer electron and the nucleus.
  • The ease of a Halogen to attract another Halogen.

11. What is 'Disproportionation'?

  • A reaction in which the same element is both reduced and oxidised.
  • A reaction in which an element is neither reduced or oxidised.
  • A reaction in which an element is oxidised.
  • A reaction in which an element is reduced.

12. What solution is added to a halide solution to detect the presence of halide ions?

  • Aqueous solution of Silver Nitrate (AgNO3).
  • Nitric Acid (HNO3).
  • Cyclohexane (C6H12).
  • Aqueous Solution of Hydrochloric Acid (HCl).

13. Which sub-shell do the highest energy electrons belong to in a Group 7 element?

  • f sub-shell
  • p sub-shell
  • d sub-shell
  • s sub-shell

14. Which statement is true?

  • The reactivity of the Halogens decreases down the group.
  • The reactivity of the Halogens increases down the group.

15. Which of these statments is true?

  • Halogens bond to form a covalent diatomic molecule, X2.
  • Halogens bond to form an ionic diatomic molecule, X2-.
  • Halogens bond to form an ionic diatomic molecule, X2+.
  • Halogens do not bond.

16. What happens in a 'displacement reaction'?

  • A less-reactive halogen will reduce and displace a halide of a more-reactive halogen.
  • A more-reactive halogen will oxidise and displace a halide of a less-reactive halogen.
  • A more-reactive halogen will reduce and displace a halide of a less-reactive halogen.
  • A less-reactive halogen will oxidise and displace a halide of a more-reactive halogen.

17. How many electrons are in the outer p sub-shell of a Group 7 element?

  • 5
  • 6
  • 7
  • 2

18. Which of these statements is false?

  • Bromide reacts with Silver Nitrate to form a cream precipitate which is soluble in concentrate ammonia - NH3 (aq).
  • Iodide reacts with Silver Nitrate to form a yellow precipitate which is insoluble in concentrate ammonia - NH3 (aq).
  • Iodide reacts with Silver Nitrate to form a yellow precipitate that is soluble in concentrate ammonia - NH3.
  • Chloride reacts with Silver Nitrate to form a white precipitate which is soluble in dilute ammonia - NH3 (aq).

19. Why does chlorination of water take place?

  • To kill bacteria.
  • To remove acid from rain.
  • To make the water taste nicer.
  • To remove unknown substances from the water.

20. Why do some people object to chlorination of water?

  • It is costly.
  • Chlorine is a toxic gas.
  • It prevents plants and vegetation from growing.
  • Sources of Chlorine are limiting.