Advertisements
Advertisements
प्रश्न
Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason (R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.
पर्याय
Statements A and R both are correct and R is the correct explanation of A.
A is correct but R is not correct.
A and R both are correct but R is not the correct explanation of A.
A and R both are false.
उत्तर
Statements A and R both are correct and R is the correct explanation of A.
Explanation:
\[\ce{MCl2 + Na2CO3 -> MCO3 + 2NaCl}\]
\[\ce{MSO4 + Na2CO3 -> MCO3 + Na2SO4}\]
APPEARS IN
संबंधित प्रश्न
how can demineralised be obtained?
The oxide that gives \[\ce{H2O2}\] on treatment with dilute \[\ce{H2SO4}\] is ______.
When sodium peroxide is treated with dilute sulphuric acid, we get ______.
Which of the following ions will cause hardness in water sample?
Which of the following compounds is used for water softening?
Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of:
(i) Chlorides of \[\ce{Ca}\] and \[\ce{Mg}\] in water.
(ii) Sulphates of \[\ce{Ca}\] and \[\ce{Mg}\] in water.
(iii) Hydrogen carbonates of \[\ce{Ca}\] and \[\ce{Mg}\] in water.
(iv) Carbonates of alkali metals in water.
Complete the following equations:
\[\ce{PbS (s) + H2O2 (aq) ->}\]
Discuss briefly de-mineralisation of water by ion exchange resin.
Which one of the following methods is most suitable for preparing deionized water?
100 ml of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalent of CaCO3 is ______.
[Molar mass of calcium bicarbonate is 162 g mol-1 and magnesium bicarbonate is 146 g mol-1)
