MCQ
Which of the following is not representative element ?
  • A
    Tellurium
  • Tantalum
  • C
    Thallium
  • D
    Astatine

Answer

Correct option: B.
Tantalum
b
From left to right in periodic table :-

Metallic character decreases

Non-metallic character increases

$\Rightarrow$ It is due to increase in ionization enthalpy and increase in electron gain enthalpy.

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

Similar questions

The number of elements present in fifth period is
$5\, g$ of benzene on nitration gave $6.6\, g$ of nitrobenzene . The theoretical yield of the nitrobenzene will be ............... $\mathrm{g}$
Which of the following equations correctly represents the standard heat of formation $(\Delta H_f^o)$ of methane
In $sp$ hybridisation, shape is
In the reaction $SnC{l_2} + 2C{l^ - } \to SnC{l_4},$ Lewis acid is
$10$ $d{m^3}$of ${N_2}$ gas and $10$ $d{m^3}$ of gas $X$ at the same temperature contain the same number of molecules. The gas $X$ is
The basis of keeping the elements in the group of a periodic table is
Consider the following statements :

$(a)$ Electron density in the $XY$ plane in $3d_x^2 - 3d_y^2$ orbital is zero

$(b)$ Electron density in the $XY$ plane in $3d_z^2$ orbital is zero

$(c)$ $2s$ orbital has one nodal surface

$(d)$ For $2pz$ orbital $YZ$ is the nodal plane.

Specify True or False.

For the reaction $X ( s ) \rightleftharpoons Y ( s )+ Z ( g )$, the plot of $\ln \frac{ p _z}{ p ^\theta}$ versus $\frac{10^4}{T}$ is given below (in solid line), where $p_z$ is the pressure (in bar) of the gas $Z$ at temperature $T$ and $P ^{\ominus}=1$ bar.

(Given, $\frac{ d (\ln K )}{ d \left(\frac{1}{T}\right)}=-\frac{\Delta H^{\ominus}}{ R }$, where the equilibrium constant, $K =\frac{ p _{ z }}{ p ^{\ominus}}$ and the gas constant, $R =8.314$ $\left.J K ^{-1} mol ^{-1}\right)$

($1$) The value of standard enthalpy, $\Delta H ^{\ominus}$ (in $kJ mol ^{-1}$ ) for the reaction is. . . . . . .

($2$) The value of $\Delta S^{\ominus}$ (in $J K ^{-1} mol ^{-1}$ ) for the given reaction, at $1000 K$ is. . . . . . 

Give the answer or quetin ($1$) and ($2$)

The correct order of $Cl-O$ bond order is