MCQ
The number of incomplete orbitals in inner transition element is
- A$2$
- ✓$3$
- C$4$
- D$1$
✓
Answer
Correct option: B.
$3$
b
(b)Inner transition elements means $f-$ block element, they have three incomplete outer orbitals.
(b)Inner transition elements means $f-$ block element, they have three incomplete outer orbitals.
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
Bond energy of covalent $O - H$ bond in water is
→For a certain first order reaction $32 \%$ of the reactant is left after $570 \,s$. The rate constant of this reaction is ........... $\times 10^{-3} s ^{-1}$. (Round off to the Nearest Integer).
→$\left[\right.$ Given $\left.: \log _{10} 2=0.301, \ln 10=2.303\right]$
The elements with atomic number $10, 18, 36, 54$ and $86$ are all
→In the given reaction :
→$\begin{array}{*{20}{c}}
O \\
{||} \\
{C{H_3} - C - C{H_3}}
\end{array}\mathop {\xrightarrow{{Conc.{H_2}S{O_4}}}}\limits_{Distillation} [X]$
$[X]$ will be :
Major product $(x)$ in this reaction is
→Sodium thiosulphate is formed when
Only two isomeric monochloro derivatives are possible for
The correct order of decreasing value of $K_{eq.}$ is
→The correct order of priority. of groups $-SCH_3 \,(I), -NO_2\, (II), -C \equiv CH \,(III)$ and $-CH_2C_6H_5 \,(IV)$, on the basis of $CIP$ classification, is (increasing order)
→Mixture of 1 g each of chlorobenzene, aniline and benzoic acid is dissolved in 50 mL ethyl acetate and placed in a separating funnel, 5 M NaOH (30 mL ) was added in the same funnel. The funnel was shaken vigorously and then kept aside. The ethyl acetate layer in the funnel contains :