Q 11 :    

Assertion: Hard water contains magnesium and calcium salts.

Reason: It is because they are easily available in hard water.

• Both assertion and reason are correct and reason is the correct explanation of assertion.

   

• Both assertion and reason are correct, but reason is not the correct explanation of assertion.

   

• Assertion is true, but reason is false.

   

• Assertion is false, but reason is true.