Question

Which of the following is not an example of compounds?

A)Bismuth

B)Ammonia

C)Carbon dioxide

D)Water​

Answer 1

Bismuth is not an example of a compound; it is an element because it is made up of only one kind of atom.

Hence option (A) Bismuth is correct.

Option B) Ammonia, C) Carbon dioxide, and D) Water​ are compounds.

Explanation:

• An element is made up of only 1 kind of atom.
• Examples: Platinum (Pt) , Hydrogen (H) , Sodium (Na) , Carbon (C)

• A compound is made up of two or more elements.
• Examples:  Table salt $\bf (NaCl)$, Nitric acid $\bf ( HNO_3)$ , Phosphoric acid $\bf ( H_3PO_4)$, Sodium carbonate $\bf (Na_2CO_3)$ , Hydrochloric acid $\bf (HCl)$ Sulfuric acid $\bf (H_2SO_4)$ , etc.

Bismuth , Ammonia , Carbon dioxide and water:

• The symbol of Bismuth is Bi.
• Its atomic number is 83.
• It is metal.

• The chemical formula of Ammonia is $\bf NH_3$. It is made up of nitrogen and hydrogen.
• Chemical formula of Carbon dioxide is $\bf CO_2$. It is made up of carbon and oxygen.
• The chemical formula of Water​ is $\bf H_2O$. It is made up of hydrogen and oxygen.

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