Which of the following components cannot be used as a water softener?
(A) \(Na_{6}P_{6}O_{18}\)
(B) \(Ca(OH)_{2}\)
(c) \(Na_{2}CO_{3}\)
(D) \(Na_{2}SO_{4}\)

Which of the following may be a use of Na_(2)CO_(3).10H_(2)O ?

Which of the following is correct ? Aqueous solution of Na_2S_2O_3 on reaction with Cl_2 gives ? (a) Na_2S_4O_6 (b) NaHSO_4 (c) NaCl (d) NaOH (ii) Acidic solution of Na_(2)S_(2)S_(2)O_(3) on reaction with Cl_(2) gives (a) Na_(2)S_(4)O_(6) (b) NaHSO_(4) NaSO_(4) (d) NaOH (iii) Basic solution of Na_(2)S_(2)O_(3) on reaction with Cl_(2) gives (a) NaOH (b) Na_(2)S_(4)O_(6) (c) Na_(2)SO_(4)^(oplus) (d) NaHSO_(4)

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

Name the following compounds. Also write the symbols/formulae of the ions present in them : (a) CuSO_(4) , (b) (NH_(4))_(2)SO_(4) , (c ) Na_(2)O , (d) Na_(2)CO_(3) , (e ) CaCl_(2)

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)