An element 'X' having atomic number 20 combines chemically with another element 'Y' having atomic number 8 to form a compound 'Z'. Which of the following statements are correct about the compound 'Z'?
(i) The formula of 'Z' is XY2.
(ii) Melting point of 'Z' is very high.
(iii) Molten form of 'Z' does not conduct electricity.
(iv) 'Z' is soluble in water but insoluble in petrol.
1
(i), (ii) and (iv)
2
(i), (ii) and (iii)
3
(ii) and (iv)
4
(ii) and (iii)