Which of the following waterborne diseases is of viral origin.
How much percentage (%) of the Earth's surface is covered with water?
Which type of bond is formed between H₂O molecules?
The permanent hardness of water is due to presence of:
How much fresh water is present on Earth?
Which salts are excessively dissolved to make temporary hard water?
Water is a:
The taste of water is:
Which of the following is helpful for the removal of permanent hardness: