It is less dense than most other material and has a higher melting point so it will not melt.
Potassium +calcium sulphate ------> K2SO4+Ca
Answer:

Explanation:
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The substance that dissolves in a solution is called a solute.
This is because a solution is made up of 2 parts, the solute, which dissolves to make the solution, and the solvent, which is the substance that dissolves the solute.
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The correct answer is option E.
Explanation:
The pH of the solution is defined as negative logarithm of hydrogen ions concentration in a solution. Mathematically written as:
![pH=-\log[H^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%5BH%5E%2B%5D)
The pOH of the solution is defined as negative logarithm of hydroxide ions concentration in a solution. Mathematically written as:
![pOH=-\log[OH^-]](https://tex.z-dn.net/?f=pOH%3D-%5Clog%5BOH%5E-%5D)
The sum of ph and pOH is equal to 14.
pH + pOH = 14
A solution has a pH of 4.20.

![pOH=9.8=-\log[OH^-]](https://tex.z-dn.net/?f=pOH%3D9.8%3D-%5Clog%5BOH%5E-%5D)
![[OH^-]=1.58\times 10^{-10} M\approx 6.0\times 10^{-10} M](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3D1.58%5Ctimes%2010%5E%7B-10%7D%20M%5Capprox%206.0%5Ctimes%2010%5E%7B-10%7D%20M)
Hence, the correct answer is option E.