MCQ
The following has zero valency
- ASodium
- BBeryllium
- CAluminium
- ✓Krypton
✓
Answer
Correct option: D.
Krypton
d
(d) $Kr $ has zero valency because it contains $8$ electrons in outermost shell.
(d) $Kr $ has zero valency because it contains $8$ electrons in outermost shell.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Find the value of enthaly of formation of $PCl_5 \,:$ Given
→$\frac{1}{2}\,{P_4}(s)\,\, + \,\,3C{l_2}(g)\, \to \,2PC{l_3}(\ell )\,\,\,\,\,\Delta H\, = \, - \,635\,\,kJ$
$PCl_3 (\ell )\,+\,Cl_2(g)\,\to \,PCl_5(s) \,\,\,\,\Delta H\, =\, -\,137\,kJ$.....$kJ$
In the case of alkali metals, the covalent character decreases in the order
The correct order of heats of combustion of above compounds is
The correct equation for the change in enthalpy is:
In the equilibrium $AB$ $\rightleftharpoons$ $A + B$; if the equilibrium concentration of $A$ is doubled, the equilibrium concentration of $B$ would become:
→The paramagnetic molecule at ground state among the following is
The law formulated by Dr. Nernst is
The shape of ethane is
The total number$(s)$ of stable conformers with non-zero dipole moment for the following compound is (are)
→In a reaction
→$C{H_2} = C{H_2}\xrightarrow[{oxid}]{{Hypochloro}}$ $M\xrightarrow{R}\begin{array}{*{20}{c}}
{C{H_2} - OH} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_2} - OH}
\end{array}$
Where $M$ = molecule; $R$ = reagent $M$ and $R$ are