Question

3. The chemical formula K,O indicates that it
consists of
(a) elements potassium and oxygen
(b) two atoms of potassium and one atom of
oxygen
(c) both (a) and (b)
(d) none of these​

Answer 1

Correct Question

The chemical formula K₂O indicates that it

consists of:

(a) elements potassium and oxygen

(b) two atoms of potassium and one atom of

oxygen

(c) both (a) and (b)

(d) none of these

Answer:

(b) two atoms of potassium and one atom of oxygen ✔

Explanation:

➛ Potassium cannot be found in free state because it is to reactive, so two atoms of potassium combines with one atom of oxygen to form potassium oxide, which is a compound and is ionic in nature.

Chemical formula:

• Atoms of elements combine to form molecules, so it is possible to represent the molecules in term of symbols of their constituent elements.
• A symbolic representation of a molecule is called chemical formula.
• A molecule of an element may contain one or more atoms.

Other options are wrong! Why?

• It is a compound not a single element.
• In case of symbol, it will indicate elements potassium and oxygen, but a chemical formula is given to us. So, option a) is incorrect. Taking first option into consideration c) option is also incorrect.

Symbol:

• A symbol is the short form that stands for an atom of a specific element or an abbreviation for it's name.

_______________________________

Answer 2

Answer:

b ) Two atoms of potassium and one atom of oxygen