Science (English Medium) Class 12 - CBSE Question Bank Solutions

Arrange the following diagrams in correct sequence of steps involved in the mechanism of catalysis, in accordance with modern adsorption theory.

                    (a)

             (b)

           (c)

               (d)

               (e)

In qualitative analysis when \[\ce{H2S}\] is passed through an aqueous solution of salt acidified with dil. \[\ce{HCl}\], a black precipitate is obtained. On boiling the precipitate with dil. \[\ce{HNO3}\], it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives ______.

A brown ring is formed in the ring test for \[\ce{NO3^{-}}\] ion. It is due to the formation of ______.

In the preparation of HNO₃, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH₃ will be ______.

\[\ce{PCl5}\] reacts with finely divided silver on heating and a white silver salt is obtained, which dissolves on adding excess aqueous \[\ce{NH3}\] solution. Write the reactions involved to explain what happens.

The electronic configuration of \[\ce{Cu(II)}\] is 3d⁹ whereas that of \[\ce{Cu(I)}\] is 3d¹⁰. Which of the following is correct?

Which of the following complexes formed by \[\ce{Cu^2+}\] ions is most stable?

When 0.1 mol \[\ce{CoCl3 (NH3)5}\] is treated with excess of \[\ce{AgNO3}\], 0.2 mol of \[\ce{AgCl}\] are obtained. The conductivity of solution will correspond to ______.

When 1 mol \[\ce{CrCl3.6H2O}\] is treated with excess of \[\ce{AgNO3}\], 3 mol of \[\ce{AgCl}\] are obtained. The formula of the complex is ______.

The correct \[\ce{IUPAC}\] name of \[\ce{[Pt(NH3)2Cl2]}\] is ______.

The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?

Which of the following complexes are homoleptic?

(i) \[\ce{[Co(NH3)6]^{3+}}\]

(ii) \[\ce{[Co(NH3)4 Cl2]^{+}}\]

(iii) \[\ce{[Ni(CN)4]^{2-}}\]

(iv) \[\ce{[Ni(NH3)4Cl2]}\]

Which of the following complexes are heteroleptic?

(i) \[\ce{[Cr(NH3)6]^{3+}}\]

(ii) \[\ce{[Fe(NH3)4]Cl2]^+}\]

(iii) \[\ce{[Mn(CN)6]^{4-}}\]

(iv) \[\ce{[Co(NH3)4]Cl2]}\]

Identify the correct statements for the behaviour of ethane-1, 2-diamine as a ligand.

(i) It is a neutral ligand.

(ii) It is a didentate ligand.

(iii) It is a chelating ligand.

(iv) It is a unidentate ligand.

Arrange the following complexes in the increasing order of conductivity of their solution:

[Co(NH₃)₃Cl₃], [Co(NH₃)₄Cl₂]Cl, [Co(NH₃)₆]Cl₃, [Cr(NH₃)₅Cl]Cl₂

A coordination compound \[\ce{CrCl3.4H2O}\] precipitates silver chloride when treated with silver nitrate. The molar conductance of its solution corresponds to a total of two ions. Write structural formula of the compound and name it.

A complex of the type \[\ce{[M(AA)2X2]^{n+}}\] is known to be optically active. What does this indicate about the structure of the complex? Give one example of such complex.

Match the complex ions given in Column I with the colours given in Column II and assign the correct code:

Match the coordination compounds given in Column I with the central metal atoms given in Column II and assign the correct code:

Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code: