Question : Which among the following combinations is present in higher amounts in hard water?
Option 1: Calcium and Magnesium
Option 2: Calcium and Sodium
Option 3: Sodium and Magnesium
Option 4: Sodium and Manganese
Correct Answer: Calcium and Magnesium
Solution : The correct answer is Calcium and Magnesium.
Calcium and magnesium are present in higher amounts in the hard water. Soaps do not act in hard water due to the presence of these salts, but detergents can give results in hard water. The temporary hardness of water is caused by the carbonates of calcium and magnesium. Calcium is a mineral our body needs to build and maintain strong bones.
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Question : The hardness of the water is commonly measured in terms of:
Option 1: calcium carbonate equivalents
Option 2: calcium sulphate equivalents
Option 3: magnesium carbonate equivalents
Option 4: magnesium sulphate equivalents
Question : Which one of the following is not a compound?
Option 1: Sodium Chloride
Option 2: Carbon Monoxide
Option 3: Iron
Option 4: Water
Question : Which of the following is a major component of water pollution in the Bengal Basin?
Option 1: Chromium
Option 2: Arsenic
Option 3: Calcium
Option 4: Potassium
Question : Which of the following is not a food preservative?
Option 1: Aqua regia
Option 2: Vinegar
Option 3: Sodium chloride
Option 4: Sodium nitrite
Question : Which one of the following metals does not react with water to produce Hydrogen?
Option 1: Potassium
Option 2: Cadmium
Option 3: Sodium
Option 4: Lithium
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