Which of the following statements is not correct?

  • A
    Hardness of water affects soap consumption.
  • B
    Temporary hardness is due to bicarbonates of $Ca$ and $Mg$.
  • C
    Permanent hardness is due to soluble sulphates and chlorides of $Ca$ and $Mg$.
  • D
    Permanent hardness can be removed by boiling water.

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Which of the following methods is used for the removal of only temporary hardness of water?

Lead pipes are not suitable for drinking water because

Given below are two statements: One is labelled as Assertion $A$ and the other labelled as Reason $R$.
Assertion $A$: During the boiling of water having temporary hardness,$Mg(HCO_3)_2$ is converted to $MgCO_3$.
Reason $R$: The solubility product of $Mg(OH)_2$ is greater than that of $MgCO_3$.
In the light of the above statements,choose the most appropriate answer from the options given below.

The velocity of neutrons in a nuclear reactor is slowed down by

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