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Hardness of water is due to calcium and magnesium ions. Sodium salts dissolve in water and hence lather is formed. When soap is added to hard water, calcium and magnesium ions replaces sodium (or potassium) ions in the soap and gets precipitated hence lather formation is hindered. Thus, this method can be employed to test the hardness of water.
For what was Albert Einstein awarded Nobel Prize?
Which is the longest bone in the human body?
The apparent weight of the body becomes zero in which of the following cases in the elevator?
Which of the following transitions in hydrogen atom will result in emission of radiation of longest wavelength?
The phenomenon due to which the sky appears blue is
The red colour of onion is caused by the presence of which pigment?
Which of the following is a process in which water from any source change into vapour state ‘due to heat’?
Which of the following materials has the highest thermal conductivity?
An object is placed on the axis of a concave mirror at its focus (F). The image formed is:
The direction of magnetic field inside a magnet is
