MCQ
Which one pair of atoms or ions will have same configuration
  • A
    ${F^ + }$ and $Ne$
  • B
    $L{i^ + }$ and $H{e^ - }$
  • $C{l^ - }$ and $Ar$
  • D
    $Na$ and $ K$

Answer

Correct option: C.
$C{l^ - }$ and $Ar$
c
(c) No. of electron are same $(18)$  in $C{l^ - }$ and $Ar$.

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

Resistance of $0.2\, M$ solution of an electrolyte is $50 \Omega .$The specific conductance of the solution is $1.4\, S\, m^{-1}.$ The resistance of $0.5\, M$ solution of the same electrolyte is $280\, \Omega .$ The molar conductivity of $0.5\, M$ solution of the electrolyte in $S\, m^2\, mol^{-1}$ is :
Plotting $1 / \Lambda_{\mathrm{m}}$ against $\mathrm{c} \Lambda_{\mathrm{m}}$ for aqueous solutions of a monobasic weak acid ($HX$) resulted in a straight line with $y$-axis intercept of $\mathrm{P}$ and slope of $S$. The ratio $\mathrm{P} / \mathrm{S}$ is

$\left[\Lambda_{\mathrm{m}}=\right.$ molar conductivity

$\Lambda_{\mathrm{m}}^{\circ}=$ limiting molar conductivity

$\mathrm{c}=$ molar concentration

$\mathrm{K}_{\mathrm{a}}=$ dissociation constant of $\mathrm{HX}$ ]

The standard heat of formation $\left(\Delta_{t} \mathrm{H}_{298}^{0}\right)$ of ethane in $(kJ/mol)$, if the heat of combustion of ethane, hydrogen and graphite are $-1560$, $-393.5$ and $-286 \;\mathrm{kJ} / \mathrm{mol},$ respectively is ........... $\mathrm{kJ/mol}$
The $IUPAC$ name of the complex -

$\left[ Ag \left( H _{2} O \right)_{2}\right]\left[ Ag ( CN )_{2}\right]$ is :

Chromatographic technique/s based on the principle of differential adsorption is/are

$A$. Column chromatography

$B$. Thin layer chromatography

$C$. Paper chromatography

Choose the most appropriate answer from the options given below:

In the above compound, how many sites are available for the attack of $CH_3O^-$ ?
For a reaction $A \to$ Products, a plot of $log\,t_{1/2}$ versus $log\,a_0$ is shown in the figure. If the initial concentration of $A$ is represented by $a_0,$ the order of the reaction is
In chromium atom number of electrons which have $n = 2$ and $l = 1$ is
The total number$(s)$ of stable conformers with non-zero dipole moment for the following compound is (are)
${I^ - }(aq.) + MnO_4^ - (aq.)\xrightarrow{{{H^ + }}}X + M{n^{2 + }}(aq.)$

${I^ - }(aq.) + MnO_4^ - (aq.)\xrightarrow[{weakly\,\,O{H^ - }}]{{Neutral\,\,or}}Y + Mn{O_2}$

$MnO_4^ - (aq.) + M{n^{2 + }}(aq.)\xrightarrow{{ZnS{O_4}}}Z + 4{H^ + }$

Products $X,\,Y$ and $Z$ are respectively :