Consider the following statements
(i). | Carbon form the most acidic dioxide among the oxide of group 14. |
(ii). | Pb mostly found in the +2 oxidation state. |
(iii). | Only silicon used as a semiconductor. |
Identify the correct statement(s):
1. Only iii
2. i, ii
3. ii, iii
4. Only ii
Identify the correct statements among the following:
a. is used as a refrigerant for ice-cream and frozen food.
b. The structure of contains twelve six-carbon rings and twenty five-carbon rings.
c. ZSM-5, a type of zeolite, is used to convert alcohol into gasoline.
d. CO is a colourless and odourless gas
1. (a) and (c) only
2. (b) and (c) only
3. (c) and (d) only
4. (a), (b) and (c) only