question_answer5) Name a non-metal which shows the following properties: (a) Is yellow and volatilizes at high temperatures, (b) Is hard and has a high melting point, (c) Is hard and has a high melting point. (d) Has lustre but does not sublime on heating. (e) Conducts electricity in the solid state. (f) Present in the alloy which has wide applications. (g) Is liquid at ordinary temperatures. (h) Has high density. (i) Forms an acidic and a neutral oxide.View Answer play_arrow
question_answer6) Give reasons for the following : (a) Aluminium finds application as a foil for wrapping food stuffs. (b) Amalgamated sodium is preferred to sodium metal for use in the preparation of hydrogen. (c) Electrical wires made of nichrome are preferred to copper wires for specific applications. (d) Zinc is added to copper in the right proportion for the manufacture of hardware and screws. (e) Flexible pipes are generally made of lead. (f) Aluminium utensils are preferred to copper utensils. (g) Solder is preferred to lead for use in fuse wire.View Answer play_arrow
question_answer7) The activity series consists of metals arranged in the order of their decreasing chemical activity. Name a metal from the activity series which itself or its compounds shows the following characteristics or properties. Name of the metal which/whose (a) Does not form an oxide at any temperature. (b) Forms an oxide even at an ordinary temperature. (c) Reacts with steam to give the metal oxide. (d) Does not liberate hydrogen with dilute acids. (e) Oxide is reduced to the metal by coke only. (f) Oxide is not reduced to the metal by any reducing agent. (g) Hydroxide is converted to its oxide at elevated temperatures. (h) Carbonate is converted to its oxide by thermal decomposition. (i) Oxide, hydroxide and carbonate are stable to heat. (j) Oxide, hydroxide and carbonate decompose to give the corresponding metal and oxygen.View Answer play_arrow
question_answer8) Name the metal which finds application in the following: (a) As a negative plate in storage batteries. (b) As an anti-corrosive paint in the powder form. For making compounds used as a pigment in paints. (c) In metallurgy as a reducing agent. (d) In the amalgamated form as a reducing agent in the neutral medium. (e) For making electrical cables and transmission wires.View Answer play_arrow
question_answer9) You should know that the oxides of nonmetals are acidic and the oxides of the metals are basic. Would you expect boron to be more acidic or more basic in its reactions than aluminium?View Answer play_arrow
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