Q50 of 65 Page 24

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?

(a) A is carbon (C) as it is an important constituent of our food , B is carbon monoxide (CO) as it is highly poisonous and toxic and C is carbon dioxide (CO2) as it is the main cause of global warming.


(b) A belongs to Group 14 of the periodic table. It has atomic number 6. Its electronic configuration is 2, 4.


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48

Give the formulae of the stable binary compounds that would be formed by the combination of following pairs of elements.

(a) Mg and N2


(b) Li and O2


(c) Al and Cl2


(d) K and O2

 49

What happens when

(a) ZnCO3 is heated in the absence of oxygen?


(b) a mixture of Cu2O and Cu2S is heated?

 51

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

 52

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).