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Q.6 “Oxidation    and    reduction    processes    occur simultaneously”. Justify this
               statement with the help of example.[CBSE 2010]


               Q.7  a.Identify the acid and the base whose combination forms the common salt that
               you use in your food.Write its chemical formula and chemical name of the salt.
                        b.   What is rock salt? Mention its colour and the reason due to which it has this
               colour.
                        c.   What happens when electricity is passed through brine? Write chemical
               equation for it.                                                                                    [CBSE 2013]

                Q.8 In the electrolysis of water:
                         a.   Name the gas collected at the cathode and anode respectively.
                         b.   Why is volume of gas collected at one electrode double than that at the other?
               Name this gas.
                         c.   How will you test this gas?   [CBSE 2012, CBSE Sample Paper 2018]








































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