Question

. Consider the following statements:
(i) fossil fuels are the non-conventional sources of energy.
(ii) lignite is the harder form of coal which contains very high amount of carbon (about 80%).
(iii) petroleum and their by products are used in heating plants for shops and offices.
(iv) LPG is the mixture of propane and butane gases kept under pressure in gaseous form, but they burn
in liquid form.
Which of the alternatives mentioned is incorrect?
(1) (i) and (iii)
(2) (ii), (iii) and (iv)
(3) (i), (ii), (iii) and (iv)
(4) (i), (ii) and (iv)​

Answer 1

Explanation:

3 is the option because everyone method harms environment