Permutit is:

(a) hydrated sodium aluminium silicate

(b) sodium hexa meta-phosphate

(c) sodium silicate

(d) sodium meta-aluminate

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When zeolites, (hydrated sodium aluminium silicate) is treated with hard water, the sodium ions are exchanged with:

(a) H+ ion

(b) Ca2+ ion

(c) SO42- ion

(d) OH- ion

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Temporary hardness is caused due to the presence of:

(a) CaSO4

(b) CaCl2

(c) CaCO3

(d) Ca(HCO3)2

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1000 g aqueous solution of CaCO3 contains 10g of calcium carbonate. Hardness of the solution is:

(a) 10 ppm

(b) 100 pm

(c) 1000 ppm

(d) 10000 ppm

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Which method cannot be used to remove hardness of water ?

(a) Clark's method

(b) By adding washing soda

(c) Calgon process

(d) Filtration

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Which salt does not cause hardness of water ?

(1) Mg(HCO3)2

(2) CaCl2

(3) MgSO4

(4) MgCO3

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Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A-

(A) CaCO3                             

(B) CaO

(C) CaOH2                           

(D) CaHCO32

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Polyphosphates are used as water softening agents because they –

(A) form soluble complexes with anionic species

(B) precipitate anionic species

(C) form soluble complexes with cationic species

(D) precipitate cationic species

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Permanent hardness of water can be removed, by adding –

(A) Sodalime

(B) Sodiumbicarbonate

(C) Washing soda

(D) Sodium chloride

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Hardness of water is due to presence of salts of –

(A) Na+ and K+                                  

(B) Ca2+ and Mg2+

(C) Ca2+ and K+                                 

(D) Ca2+ and Na+

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