Latest NDA Aptitude Question SOLUTION: Which of the following statements regarding the property of hard water is/are correct ?
1. Temporary hardness of water is due to the presence of soluble magnesium and calcium hydro
Which of the following statements regarding the property of hard water is/are correct ?
1. Temporary hardness of water is due to the presence of soluble magnesium and calcium hydrogen carbonate
2. Temporary harndness of water can be removed by boiling
3. Calgon's method is applied to remove temporary hardness of water
4. Permanent hardnes of water is removed by Clark's method
Select the correct answer using the code given below :
(a) 1 and 2 only
(b) 1, 2 and 3
(c) 3 and 4
(d) 2 only
Mathematics has 25%formulas, 25%proofs and apply 25%thinking and 25%efforts.
In real life situations proofs are nothing but already existed stories(we know the solutions from all experienced people).
formulas are nothing but goals. we have so many goals b