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Answer:
c element belongs to group 18. B element belongs to group 15 . A element belongs to group 13 .HOPE IT HELPS U
Answer:
12.
(i) 'c' element belongs to group 18.
(ii) 'B' element belongs to group 15.
(iii) 'A' element belongs to group 13.
(iv) These belongs to 2nd period.
13.It is used as coolant car radiators.
EXPLANATION:
Due its high specific heat capacity,it can absorb a large amount of heat energy from the car, but its temperature does not rise too high.
11.(a) He is suffering from the presbyopia.
which he is suffering from both myopia and hypermetropia.
(b) To correct this type of defect of vision bifocal lens is needed which is formed by using both convex lens and concave lens. In this lens the upper portion is covered by concave lens and the lower portion is covered by convex lens. This lens is required to increase his range of vision from 25cm to infinity.