[" Which of the following ions will cause hardness in "],[" water sample? "]

Which of the following ion will cause hardness in water sample

Which of the following compound can cause hardness in water ?

Which of the following does not cause hardness of water ?

What causes hardness in water ?

Which of the following ions are responsible for hardness of water?

When a sample of hard water is passed through the layer of sodium zeolite resulting which of the following ions will not be present in the resulting sample of water obtained?