let's see who will solve this i will surely follow and Mark him/her as brainlist.
but,after you solve questions from 13-27
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16.the deliberate use of artificial methods or other techniques to prevent pregnancy as a consequence of sexual intercourse
17.CnH2n-2
18.Ethane
19. Concave mirror
20.phosphorous and Calcium
24. Yellow And bright precipitate of lead iodide is formed
Pb(NO3)2+2KI= PbI2+2 KNO3
It is substitution reaction
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