Precipitate of AgCl is soluble in liquid NH₃, the compound forms

Solution

\(AgCl+2NH_{3}\rightarrow \underset{diammine\, silver\, (I)\, chloride}{Ag(NH_{3})_{2}Cl}\)

A solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of

Solution

The reaction can be represented as

\(3Na_{2}S_{2}O_{3}+2FeCl_{3}\rightleftharpoons \underset{(Violet)}{Fe_{2}(S_{2}O_{3})_{3}}+6NaCl\)

Zinc and mercury do not show variable valency like d-block elements because

Solution

₃₀Zn and ₈₀Hg have their d orbitals completely filled so they do not show any variable valency

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

Which of the following combines with Fe (II) ions to form a brown complex?

Solution

We know that when nitrogen oxide (NO) combines with Fe (II) ions, a brown complex is formed. This reaction is called brown ring test.

A blue colouration is not obtained when

Solution

\(2CuSO_{4}+K_{4}[Fe(CN)6]\rightarrow \underset{Chocolate\, ppt.}{Cu_{2}[Fe(CN)_{6}]}+2K_{2}SO_{4}\)

For d block elements the first ionization potential is of the order :

When a small amount of KMnO₄is added to concentrated H₂SO₄, a green oily compound is obtained which is highly explosive in nature. Compound may be :

Of the following outer electronic configurations of atoms,the highest oxidation state is achieved by which one of them ?

Potassium dichromate when heated with concen tratedsulphuric acid and a soluble chloride, gives brown-red vapours of :

Solution

Solid potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride gives orange red vapours of a volatile oily liquid CrO₂Cl₂

K₂Cr₂O₇+ 4NaCl +6H₂SO₄ → 2KHSO₄+ 4NaHSO₄+ \(\underset{chromyl\, chloride}{2CrO_{2}Cl_{2}}\)

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