Q52 of 65 Page 24

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).

A metal that exits in liquid state at room temperature is mercury (Hg). A non-metal that exits in liquid state at room temperature is bromine (Br).


Two metals with melting points less than 310K (37°C) are Cesium (Cs) and Gallium (Ga).


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50

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?

 51

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

 53

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.

 54

An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.