Q51 of 65 Page 24

Give two examples each of the metals that are good conductors and poor conductors of heat respectively.

Metals in general, are conductors of heat. Some are good conductors whereas some are poor conductors of heat. Owing to the number of free electrons they have, they are classified into good or poor conductors of heat. Those metals that have more number of free electrons are good conductors and those that have less number of free electrons are poor conductors of heat.


(a) Ag (Silver) and Cu (Copper) are good conductors of heat.


(b) Pb (Lead) and Hg (Mercury) are poor conductors of heat.


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A non-metal A is an important constituent of our food and forms two oxides B and C. Oxide B is toxic whereas C causes global warming.

(a) Identify A, B and C.


(b) To which Group of periodic table does A belong?

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Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (37°C).

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An element A reacts with water to form a compound B which is used in white washing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.