MCQ
Variable valency in general, is exhibited by
  • Transition elements
  • B
    Gaseous elements
  • C
    Non-metals
  • D
    $s$-block elements

Answer

Correct option: A.
Transition elements
a
(a) Transition elements due to presence of vacant $d$-orbitals.

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

Which one of the following is most soluble
In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is
For the following reaction in gaseous phase $CO\left( g \right) + \frac{1}{2}{O_2}\left( g \right) \to C{O_2}\left( g \right),{K_p}/{K_c}$ is
$3.00\, moles$ of $PCl_5$ kept in $1\,L$ closed reaction vessel was allowed to attain  equilibrium at $380\, K$. If $1.59 \, mole$ reactant was converted into the product at  equilibrium. Then $K_c$ :-
Order of the bond strength of $C-H$ bonds involving $sp, sp^2$ and $sp^3$ hybridized carbon atoms is
Ferrosilicon is used in steel industry as
Tincture of iodine is
For the given reaction, choose the correct expression of $\mathrm{K}_{\mathrm{C}}$ from the following :-$\mathrm{Fe}_{(\mathrm{aq})}^{3+}+\mathrm{SCN}_{(\mathrm{aq})}^{-} \rightleftharpoons(\mathrm{FeSCN})_{(\mathrm{aq})}^{2+}$
On introducing a catalyst at $500\,K,$ the rate constant of a first order reaction increases $2.718$ times. If the activation energy in the presence of a catalyst is $4.15\, kJ\, mol^{-1}.$ Then what will be $E_a$ in absence of catalyst (value of $e = 2.718$ ) ......... $kJ$
Given below are two statements : one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$

Assertion $(A)$ : The first ionization enthalpy of $3 d$ series elements is more than that of group $2$ metals

Reason $(R)$ : In $3d$ series of elements successive filling of d-orbitals takes place.

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