Match Column I with Column II

 

	Column I		Column II
A	1ppm of F- in water	i	tooth to become mottled
B	1.5 ppm of F- in water	ii	water become poisonous
C	Grater than than 1.5 ppm of F- in water	iii	used in rat poison
		iv	prevent tooth decay

Choose the correct answer from the options given.

	A	B	C
1	ii	i	iv
2	i	ii	ii
3	iv	i	ii
4	ii	iv	iii

• A

  1

• B

  2

• C

  3

• D

  4