Q17 of 805 Page 194

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 A belongs?

(a) A is Carbon (C). B is Carbon monoxide (CO). C is Carbon dioxide (CO2).

(b) Carbon belongs to group 14.


NOTE: Carbon is a non-metal. Carbon monoxide is formed due to the combustion of carbon in limited supply of air. Carbon dioxide is formed due to combustion of carbon in excess supply of air.


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15

Among the statements given below select the ones that describe the concept of sustainable development

(i) Planned growth with minimum damage to the environment


(ii) Growth irrespective of the extent of damage caused to the environment


(iii) Stopping all developmental work to conserve the environment


(iv) Growth that is acceptable to all the stakeholders

 16

Identify the oxidising agent (oxidant) in the following reactions

(a) Pb3O4 + 8HCl → 3PbCl2 + Cl2 + 4H2O


(b) Mg + 2H2O → Mg (OH)2 + H2


(c) CuSO4 + Zn → Cu + ZnSO4


(d) V2O5 + 5Ca → 2V + 5CaO

 18

Atomic number of a few elements are given below

(i) 10 (ii) 20


(iii) 7 (iv) 14


(a) Identify the elements


(b) Identify the period to which these elements belong

 19

What will happen if the mucus is not secreted by the gastric glands?