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

Thermodynamic feasibility of the reaction alone cannot decide the rate of the reaction. Explain with the help of one example.

Why in the redox titration of \[\ce{KMnO4}\] vs oxalic acid, we heat oxalic acid solution before starting the titration?

Match the statements given in Column I and Column II

What happens to most probable kinetic energy and the energy of activation with increase in temperature?

At the equilibrium position in the process of adsorption ______.

What are the applications of adsorption in chemical analysis?

Extraction of gold and silver involves leaching the metal with CN^– ion. The metal is recovered by ______.

At the temperature corresponding to which of the points in figure, FeO will be reduced to Fe by coupling the reaction \[\ce{2FeO -> 2Fe + O2}\] with all of the following reactions?

(a) \[\ce{C + O2 -> CO2}\]

(b) \[\ce{2C + O2 -> 2CO}\]

(c) \[\ce{2CO + O2 -> 2CO2}\]

(i) Point A

(ii) Point B

(iii) Point D

(iv) Point E

On heating with concentrated \[\ce{NaOH}\] solution in an inert atmosphere of \[\ce{CO2}\], white phosphorus gives a gas. Which of the following statement is incorrect about the gas?

In the preparation of compounds of Xe, Bartlett had taken \[\ce{O^{+}_2 Pt F^{-}_6}\] as a base compound. This is because ______.

Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type \[\ce{Pd(C6H5)2 (SCN)2]}\] and \[\ce{[Pd(C6H5)2 (NCS)2]}\] are ______.

The compounds \[\ce{[CO(SO4)(NH3)5]Br}\] and \[\ce{[Co(SO4)(NH3)5]Cl}\] represent

What kind of isomerism exists between \[\ce{[Cr(H2O)6]Cl3}\] (violet) and \[\ce{[Cr(H2O)5Cl]Cl2 . H2O}\] (greyish-green)?

Which of the following complexes show linkage isomerism?

(i) \[\ce{[Co(NH3)5 (NO2)]^{2+}}\]

(ii) \[\ce{Co(H2O)5 CO]^{3+}}\]

(iii) \[\ce{[Cr(NH3)5 SCN]^{2+}}\]

(iv) \[\ce{Fe(en)2 Cl2]^+}\]

Name the type of isomerism when ambidentate ligands are attached to central metal ion. Give two examples of ambidentate ligands.

Match the complex species given in Column I with the possible isomerism given in Column II and assign the correct code:

Assertion: Linkage isomerism arises in coordination compounds containing ambidentate ligand.

Reason: Ambidentate ligand has two different donor atoms

CoSO₄Cl.5NH₃ exists in two isomeric forms ‘A’ and ‘B’. Isomer ‘A’ reacts with AgNO₃ to give white precipitate, but does not react with BaCl₂. Isomer ‘B’ gives white precipitate with BaCl₂ but does not react with AgNO₃. Answer the following questions.

1. Identify ‘A’ and ‘B’ and write their structural formulas.
2. Name the type of isomerism involved.
3. Give the IUPAC name of ‘A’ and ‘B’.

Arrange the following compounds in increasing order of their boiling points.

(a)  \[\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
\backslash\phantom{...........}\\
\ce{CH - CH - CH2Br}\\
/\phantom{.............}\\
\ce{CH3}\phantom{..................}
\end{array}\]

(b) \[\ce{CH3CH2CH2CH2Br}\]

(c) \[\begin{array}{cc}
\phantom{...}\ce{CH3}\\
\phantom{}|\\
\ce{H3C - C - CH3}\\
\phantom{}|\\
\phantom{..}\ce{Br}
\end{array}\]

Reaction of \[\ce{C6H5CH2Br}\] with aqueous sodium hydroxide follows ______.