Question

Which of the following is not a compound ? 1) marble 2) washing soda 3) quick lime 4) brass

Answer 1

4) Brass is not a compound.

Explanation:

A compound is a substance which comprises of atoms or ions of more than two different elements. These elements are bound in definite proportion to form a compound. Brass is not a compound whereas washing soda, quick lime and marble are all compounds. Brass is an alloy of copper and zinc. In this alloy, the proportion of zinc and copper is not the same but is different.

In other words, the ratio of zinc (Zn) and copper (Cu) is not the same and chemical bond between the two is not strong making brass a mixture.

Answer 2

Option (4) is the correct answer

Brass is not a compound

Explanation:

• Marble, washing soda and Quick lime  are compounds which are made up of more than one elements.

• Brass is a mixture of two metals Copper and Zinc, it is an alloy of Copper and Zinc.
• Brass is not a compound but is an alloy.
• Marble is a metamorphic rocks composed of carbonate minerals commonly calcite or dolomite
• Washing soda is a compound with the formula Na₂CO₃, It is sodium carbonate, which is a salt of carbonic acid.
• Washing soda is used to  prepare laundry detergent.
• Quick lime is Calcium oxide (CaO), which is also known as burnt lime.
• It is a chemical compound. which is a white, caustic, alkaline, crystalline solid.

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