Download App

STD 11 -p-Block elements - I — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 -p-Block elements - I4 Marks
MCQ
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:

Assertion $A$ : The stability order of +$1$ oxidation state of $\mathrm{Ga}$, In and $\mathrm{Tl}$ is $\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$.

Reason $R$ : The inert pair effect stabilizes the lower oxidation state down the group.

In the light of the above statements, choose the correct answer from the options given below :

  • ✓
     Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
  • B
     $A$ is true but $R$ is false.
  • C
     Both $A$ and $R$ are true but $R$ is $NOT$ the correct explanation of $A$.
  • D
     $A$ is false but $R$ is true.
✓

Answer

Correct option: A.
 Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
a
The relative stability of +$1$ oxidation state progressively increases for heavier elements due to inert pair effect.

$\therefore$ Stability of $A \ell^{+1}<\mathrm{Ga}^{+1}<\mathrm{In}^{+1}<\mathrm{T} \ell^{+1}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The hybridization involved in the six carbon atoms of benzene is
→
Two compounds have the structural formulae $C{H_3} - O - C{H_2}C{H_3}$ and $C{H_3} - C{H_2} - C{H_2}OH$. The above is an example of
→
On the basis of following equations the heat of dimerisation of $NO_2$ will be

$(i)\, N_2 + 2O_2 \to 2NO_2\,\,\, \Delta H = 67.9\,kJ$

$(ii)\, N_2 + 2O_2 \to N_2O_4\,\,\, \Delta H = 9.3\,kJ$

......$kJ$

→
The characteristic grouping of secondary alcohols is
→
The $emf$ of the cell reaction

$Ag|A{g^ + }\left( {0.1M} \right)||A{g^ + }\left( {1M} \right)|Ag$ at $298\, K$ is ......... $\mathrm{V}$

→
In the reaction  $A_{(g)} + 2B_{(g)}$ $\rightleftharpoons$ $C_{(g)} + Q\,kJ$, greater product will be obtained or the forward reaction is favoured by
→
Which of the following has the smallest number of molecules
→
What happens when an inert gas is added to an equilibrium keeping volume unchanged?
→
Match List-I with List-II.
List-I
(Complex)}		List-II
(Hybridisation of central metal ion)
(A) $\left[\mathrm{CoF}_{6}\right]^{3-}$(I) $ d^2 sp ^3$
(B) $\left[\mathrm{NiCl}_{4}\right]^{2}$(II) $sp ^3$
(C) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$(III) $ sp ^3 d^2$
(D) $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$(IV) $dsp ^2$

Choose the correct answer from the options given
→
Given below are two statements:

Statement $I:$ The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions.

Statement $II:$ The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of $H$-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below :

→