1. Carbon and chlorine form a chloride.

            What is the formula of this chloride?


2. Which property would all the hydrogen compounds of the Group VII elements possess?


3. Which equation represents the reaction between hydrochloric acid and sodium hydroxide?


4. Naturally occurring bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative isotopic masses 79 and 81.

            What can be deduced about naturally-occurring bromine from this information only?



5. Every year millions of tonnes each of chlorine and sodium hydroxide are manufactured by the electrolysis of brine using a ‘diaphragm cell’.


            What is the purpose of the diaphragm in such a cell?



6. Which statement describes the halogens chlorine, bromine and iodine?


7. Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2.

What is the change in oxidation number of sulfur in this reaction?


8. Sulfur dioxide is used to bleach wood pulp in the production of paper. It is also used as an additive in the production of jam and marmalade, often in the form of sulfite compounds. When it is present in quantities greater than 10 mg / kg it is required to be listed as an ingredient of the jam.


Why is sulfur dioxide added to jam?


9. How does concentrated sulfuric acid behave when it reacts with sodium chloride?


10. Which environmental problem is not made worse by the release of oxides of nitrogen from car engines?


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