An aqueous solution of a salt X turns blood red on treatment with `SCN^(-)` and blue on treatment with `K_(4)[Fe(CN)_(6)]. X` also gives a positive chromyl chloride test. The salt X is:

Cu^(2+) salts with K_(4)[Fe(CN)_(6)] gives

(i) An aqueous solution of a compound A is acidic towards litmus and A sublimes at about 300^(@)C (ii) A solution of A, on treatment with an excess of NH_(4)SCN , gives a red compound, and on treatment with a solution of K_(4)[Fe(CN)_(6)] , gives a blue compound. (iii) The solid A, on being heated with an excess of K_(2)Cr_(2)O_(7) in the presence of concentrated H_(2)SO_(4) , evolves deep red vapours of D. (iv) On passing the vapours of D into a solution of NaOH and then adding the solution of acetic acid and lead acetate, a yellow precipitate of a compound E is obtained. Q. Can compound A be prepared in the anhydrous form by strongly heating its hydrated crystals?

K_4[Fe(CN)6] is an example of ____ salt.

A hydrated salt (x) gives golden yellow colour in flame test, given basic gas on treatement with NaOH , gives yellow ppt. on treatment with (NH_(4))_(2)MoO_(4) and HNO_(3) . It gives blue bead with Co^(2+) salt. The salt (x) is:

Which of the following aqueous solution shas osmotic presseure nearest to that of an equimolar solution of K_(4)[Fe(CN)_(6)]