Analytical Test...

A mixture of salts (Na₂SO₃ + K₂Cr₂O₇ ) in a test tube is treated with dil. H₂SO₄ and resulting gas is passed through lime water. Which of the following observations is correct about this test?

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.
The filtrate (Q) remained unchanged, when treated with H₂S in dilute mineral acid medium. However, it gave a precipitate (R) with H₂S in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with H₂O₂ in an aqueous NaOH medium.
The precipitate P contains

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.
The filtrate (Q) remained unchanged, when treated with H₂S in dilute mineral acid medium. However, it gave a precipitate (R) with H₂S in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with H₂O₂ in an aqueous NaOH medium.
The coloured solution S contains

If Fe³⁺ and Cr³⁺ both are present in group III of qualitative analysis, then distinction can be made by

In the precipitation of the iron group in qualititative analysis, ammonium chloride is added before adding ammonium hydroxide to

A precipitate of…..would be obtained when HCl is added to a solution of stannous sulphide (SnS) in yellow ammonium sulphide

The acidic solution of a salt produced a deep blue colour with starch iodide solution. The salt may be

Concentrated nitric acid is added before pro-ceeding to test for group III members. This is to

Which one of the following nitrate when heated gives off a gas or a mixture of gases which cannot relight a glowing splinter ?

When a mixture of solid NaCl, solid K₂Cr₂O₇ is heated with conc. H₂SO₄, orange red vapours are obtained. These are of the compound