Calgon used as a water softener is
(A) `Na_4[Na_2(PO_4)_6]`
(B) `Na_4[Na_4(PO_4)_5]`
(C) `Na_4[Na_2(PO_3)_6]`
(D) `Na_2[Na_4(PO_3)_6]`

Na_(3)PO_(4)+Fe_(2)(SO_(4))_(3) to FePO_(4) darr+Na_(2)SO_(4)

Na_(2)SeO_(4) and Na_(2)SO_(4) are:

Calculate the oxidation number of each sulphur atom in the following compounds. (a) Na_(2)S_(2)O_(3) " " (b) Na_(2)S_(4)O_(6) " " ( c) Na_(2)SO_(3) " " (d) Na_(2)SO_(4)

Na_(2)CO_(3)+PbSO_(4) to PbCO_(3) darr+Na_(2)SO_(4)

Under the influemce of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl,Na_(2)SO_(4) , and Na_(3)PO_(4) solutions. Their coagulation values will in the order a. NaClgtNa_(2)SO_(4)gtNa_(3)PO_(4) b. Na_(2)SO_(4)gtNa_(3)PO_(4)gtNaCl c. Na_(3)PO_(4)gtNa_(2)SO_(4)gtNaCl d. Na_(2)SO_(4)gtNaClgtNa_(3)PO_(4)

The pairs of compounds which cannot exist together in aquous solution are: (I) NaH_(2)PO_(4) and Na_(2)HCO_(3) (II) Na_(2)CO_(3) and NaOH (III) NaOH and NaH_(2)PO_(4) (IV) NaHCO_(3) and NaOH

Sulphur has highest oxidation state in a. SO_(2) b. H_(2)SO_(4) c. Na_(2)S_(4)O_(6) d. Na_(2)S_(2)O_(3)

The oxidation number of S in Na_(2)S_(4)O_(6) is

AlCl_(3)+Na_(3)PO_(4) to AlPO_(4) darr

BaSO_(4) darr+Na_(2)CO_(3) to BaCO_(3)darr+Na_(2)SO_(4)