NDA Government Jobs Exams

Which one among the following is a double salt ?
(A) K4[Fe(CN)6] (B) K2SO4Al2(SO4)324H2O
(C) CuSO4.5H2O (D) NaCl

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NDA Other Question

Deionised water is produced by
(A) Calgon process (B) ion-exchange resin process
(C) Clark's process (D) Permuit process Which one among the following is the correct order the strength of acids ?
(A) H2SO4 > H3PO3 > CH3COOH (B) H2PO3 > H2SO4 > CH3COOH
(C) CH3COOH > H3PO3 > H2SO4 (D) CH3COOH > H2SO4 > H3PO3