MCQ
Temporary hardness of water is due to the presence of:
- ✓Magnesium bicarbonate
- BCalcium chloride
- CMagnesium sulphate
- DCalcium carbonate
✓
Answer
Correct option: A.
Magnesium bicarbonate
- Magnesium bicarbonate
Permanent hardness is the hardness that cannot be removed by boiling. It is usually caused by the presence of calcium sulphate or magnesium sulphates or chlorides, nitrates of Ca, Mg in the water which does not precipitate out as the temperature increases.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The hybridisation in $B{F_3}$ molecule is
→The bond between two identical non-metal atoms has a pair of electrons
The correct statement$(s)$ about the compound $\mathrm{H}_3 \mathrm{C}(\mathrm{HO}) \mathrm{HC}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH}) \mathrm{CH}_3(\mathbf{X})$ is(are)
→$(A)$ The total number of stereoisomers possible for ${X}$ is $6$
$(B)$ The total number of diastereomers possible for ${X}$ is $3$
$(C)$ If the stereochemistry about the double bond in ${X}$ is trans, the number of enantiomers possible for ${X}$ is $4$
$(D)$ If the stereochemistry about the double bond in ${X}$ is cis, the number of enantiomers possible for ${X}$ is $2$
A solution of sodium chloride in contact with atmosphere has a $pH$ of about
→In carbon tetrachloride, four valence of carbon are directed to four corners of
$R$ and $S$ configuration of compound $(A)$ & $(B)$ will be
→Which one is oxidising substance
Which compound is $2, 2, 3-$ trimethylhexane
→In which of the following molecule all bond length are same
The best conductor of electricity is a $ 1.0 \,M$ solution of
→