Chemistry
Grade-7
Easy
Question
Which of the following is a mixture?
(i).Tap water
(ii). Alum powder
(iii). Bread
(iv). Soda water
(v). Carbon dioxide
- Only (i), (ii) and (iii)
- Only (i), (iii) and (iv)
- Only (ii), (iii) and (v)
- Only (i), (iii) and (iv)
Hint:
Only (i), (iii) and (iv)
The correct answer is: Only (i), (iii) and (iv)
- Tap water has minerals, air, chlorine, and other dissolved pollutants that vary by location, thus it is a combination.
- Alum is an inorganic chemical compound composed of water molecules, aluminium or other metals, and sulphates. Alum is a hydrated double sulphate salt of aluminium. Alums can occur naturally as minerals.
- Bread is a concoction. It is the fact that bread is a mixture of many different separate chemical ingredients that have been combined to produce a substance. Bread contains components such as starch, sugar, and sodium chloride.
- Soda water is composed of water, carbon dioxide, and occasionally other ingredients such as sugar flavourings, soil, and metallic solution. Hence, it is a mixture of various substances known as a heterogeneous mixture.
- CO2 is a chemical molecule made up of two oxygen atoms and one carbon atom.
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