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10Soft water contains soluble salts of calcium and magnesium.
Hard water produces less lather with soap.
Temporary hardness can be removed by boiling water.
Permanent hardness can be removed by boiling.
Clark’s method uses calcium hydroxide to remove temporary hardness.
Rainwater is an example of hard water.
Well water is generally hard.
Washing soda can be used to remove permanent hardness of water.
Permutit method uses sodium zeolite to soften water.
24-carat gold contains alloys for daily use.
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Hard water contains which of the following salts?
Which method should be used to remove the permanent hardness of water?
Which of the following water has the lowest hardness?
Which water produces more lather with soap?
Hard water contains which salts?
Which method removes permanent hardness?
Temporary hardness of water can be removed using:
Why did the goldsmith suggest 22-carat gold for daily use?
Which of the following is soft water?
In the Permutit method, sodium in sodium zeolite is replaced by:
Water that gives more lather with soap is called ______
Water containing soluble salts of calcium and magnesium is called ______
The type of hardness that can be removed by boiling is ______
Clark method uses ______ to remove temporary hardness.
Permanent hardness of water cannot be removed by ______.
Hard water contains ______, chloride, and bicarbonate salts of calcium and magnesium.
The Permutit method uses ______ to soften water.
Boiling converts bicarbonate salts into ______.
24-carat gold is ______ gold.
22-carat gold contains ______ for durability in daily use.