A substance X is formed from an exhaustible natural resource . It is a black and thick liquid with an unpleasant smell .It is a mixture of 200 substances. Some of the products such as dyes, explosives, paints, perfumes etc. Are obtained using this resource. The substance X is

crude oil

Explanation:

The substance X would be crude oil.

Crude oil is a non-renewable natural resource that is black and thick in appearance. It is a mixture of several products and these are often separated by a process known as fractional distillation.

Some of the products from the fractional distillation of crude oil include the premium motor spirit (petrol), automotive gas oil (diesel), kerosene, etc., and derivatives for the production of dyes, paints, perfumes, etc.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

i believe it is c.) 1575 j.