Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

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 ______.

Which of the following oxidation state is common for all lanthanoids?

There are 14 elements in actinoid series. Which of the following elements does not belong to this series?

Which of the following actinoids show oxidation states upto +7?

(i) Am

(ii) Pu

(iii) U

(iv) Np

Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids.

Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

Indicate the complex ion which shows geometrical isomerism.

\[\ce{IUPAC}\] name of \[\ce{[Pt(NH3)2 Cl(NO2)]}\] is ______.

Assertion: Complexes of MX₆ and MX₅L type (X and L are unidentate) do not show geometrical isomerism.

Reason: Geometrical isomerism is not shown by complexes of coordination number 6.

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 ______.

Which is the correct increasing order of boiling points of the following compounds?

1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane

Which is the correct increasing order of boiling points of the following compounds?

1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene

Out of o-and p-dibromobenzene which one has higher melting point and why?

Which of the following compounds will have the highest melting point and why?

(I)
(II)
(III)