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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?
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.