Question

Calgon used as a water softener is

A. $$N{a_2}\left[ {N{a_4}{{\left( {P{O_3}} \right)}_6}} \right]$$  
B. $$N{a_4}\left[ {N{a_2}{{\left( {P{O_3}} \right)}_6}} \right]$$
C. $$N{a_4}\left[ {N{a_4}{{\left( {P{O_4}} \right)}_5}} \right]$$
D. $$N{a_4}\left[ {N{a_2}{{\left( {P{O_4}} \right)}_6}} \right]$$
Answer :   $$N{a_2}\left[ {N{a_4}{{\left( {P{O_3}} \right)}_6}} \right]$$
Solution :
The complex salt of metaphosphoric acid sodium hexametaphosphate $${\left( {NaP{O_3}} \right)_6},$$   is known as calgon. It is represented as $$N{a_2}\left[ {N{a_4}{{\left( {P{O_3}} \right)}_6}} \right]$$

Releted MCQ Question on
Inorganic Chemistry >> Hydrogen

Releted Question 1

$$HCl$$  is added to following oxides. Which one would give $${H_2}{O_2}$$ ?

A. $$Mn{O_2}$$
B. $$Pb{O_2}$$
C. $$Ba{O_2}.8{H_2}O$$
D. $$N{O_2}$$
Releted Question 2

Heavy water is

A. $${H_2}{}^{18}O$$
B. water obtained by repeated distillation
C. $${D_2}O$$
D. water at $${4^ \circ }C$$
Releted Question 3

The oxide that gives hydrogen peroxide on treatment with a dilute acid is :

A. $$Pb{O_2}$$
B. $$N{a_2}{O_2}$$
C. $$Mn{O_2}$$
D. $$Ti{O_2}$$
Releted Question 4

Hydrogen gas will not reduce :

A. heated cupric oxide
B. heated ferric oxide
C. heated stannic oxide
D. heated aluminium oxide

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Hydrogen


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