Download App

STD 12 - p -Block elements - ll — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - p -Block elements - ll4 Marks
MCQ
The noble gases can be separated by
  • A
    passing them through suitable solution
  • B
    electrolysis of their fluorides
  • ✓
    adsorption and desorption on charcoal
  • D
    adsorption and desorption on activated hydrogen
✓

Answer

Correct option: C.
adsorption and desorption on charcoal
c
The gaseous mixture that is free of oxygen and nitrogen is used for separating the noble gases. This is done using coconut charcoal which adsorbs different gases at different temperatures.

The property of adsorption to coconut charcoal increases with atomic weight of the noble gases. Thus, helium which has the least atomic weight adsorbs the least while xenon with maximum atomic weight adsorbs strongly.

The temperature at which the adsorption takes place increases with the increase in the atomic weight.

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

Number of $\pi - {\rm{bonds}}$ present in $ B.H.C. $ (Benzene hexachloride) are
→
Which one of the following will produce a primary alcohol by reacting with $C{H_3}MgI$
→
Which of the following complex ion is not expected to absorb visible light ?
→
Choose the correct statement regarding transition elements?
→
The incorrect statement regarding above reactions is

$\mathop {Al}\limits_{metal} \xrightarrow[{(aq.)}]{{HCl}}'X' + Gas\,'P'$

$\mathop {Al}\limits_{metal} \xrightarrow[{ + {H_2}O}]{{NaOH\,(aq.)}}'Y' + Gas\,'Q'$

→
Given below are two statements :
Statement I : $\mathrm{CrO}_{3}$ is a stronger oxidizing agent than $\mathrm{MoO}_{3}$
Statement II : $\mathrm{Cr}(\mathrm{VI})$ is more stable than $\mathrm{Mo}(\mathrm{VI})$
In the light of the above statements, choose the correct answer from the options given below
→
Which one of the following bonds has the highest average bond energy $(kcal/mol)$
→
In an electroplating experiment $mg$ of silver is deposited, when $4 $ amperes of current flows for $2 $ minutes. The amount (in $gms$) of silver deposited by $ 6$  amperes of current flowing for $40$  seconds will be
→
For the reversible reaction in equilibrium

${N_2}\left( g \right) + {O_2}\left( g \right)\underset{{{k_2}}}{\overset{{{k_1}}}{\longleftrightarrow}}2NO\left( g \right)$

$C_0 = Ce^{-2.1×10^{-3}\ t}$ for the forward reaction and

$C_0'= C'e^{-4.2×10^{-4}\ t}$ for the backward reaction, hence $K_c$ for the above equilibrium is

→
What is the end product of the following sequences of operations 

 $Ca{C_2}\xrightarrow{{{H_2}O}}A\mathop {\xrightarrow{{{\text{dil}}{\text{. }}{H_2}S{O_4}}}}\limits_{H{g^{ +  + }}} B\mathop {\xrightarrow{{Ni}}}\limits_{{H_2}} C$

→