Question

Which of the following is not a compound? [1]
(a) Gold
(b) Sodium chloride
(c) Calcium carbonate
(d) Carbon dioxide​

Answer 1

Answer:

(d) Carbon dioxide

Explanation:

Among these only carbon dioxide is a compound.

Compound is a substance formed from two or more elements chemically bonded in a definite proportion.

Example- Carbon dioxide, water, glucose, etc.

In the given options,

A- the black residue that is left after charring sugar is carbon. Carbon is an element in pure state.

B- Nitrogen gas is a molecule as it is composed of only one element ie., Nitrogen so this can't be termed as a compound.

C- Air is a homogeneous mixture of different gases.

Answer 2

Answer:

hi labyu kung sino ka man