Question

 

Choose the correct statement :

The reason for use of polyphosphates as water softening agents is, that

Solution

Correct option is

They form soluble complexes with cationic species

 

Polyphosphates (e.g., sodium hexa metaphosphate) form soluble complexes with cations such as Ca2+, Mg2+ and so they are used as water softening agents.

         

              “Calgon”                Hardness                 ‘Soluble’

Sod. Hexa metaphosphate

SIMILAR QUESTIONS

Q1

Which of the following has the highest decomposition temperature?

Q2

Bleaching powder slowly loses its activity when it stands in air. This is due to

Q3

Chloride of an element gives natural solution in water. In the periodic table the element belongs to

Q4

Among the following compounds of cement which is present in the highest amount?

Q5

Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of

Q6

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

Q7

Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

Q8

Lithium can not be stored in kerosene oil because

Q9

Which one out of the NaOH and KOH, is a better absorber of CO2?

Q10

 

Which product is formed in the following reaction