Write the chemical name of the following and also give their molecular formulae :
(a) Banking soda
(b) Vinegar
(c) Marble
(d) Sand
Write answers the following questions.
(a) Name the constituents of food and give five examples of each.
(b) Name some fibrous foods.
(c) Why it is necessary to preserve foodstuffs?
(d) What are the various methods of preserving food?
(e) What is meant by pasteurisation?
(f) Give the names of chemical preservatives.
Name the metal which is extracted from the ore called 'Rock salt' (b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae. (c) Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equation of the reactions involved. (d) In the electrolytic refining of a metal M, what would you tak eas anode, cathode and electrolyte? (e) Name any five metals which are purified by electrolytic refining method.