MCQ
The effect caused by lanthanoid contraction is :
- ASame oxidation state of Zr and Nb .
- ✓Zr and Hf have almost same atomic size.
- CZr and Y have almst same atomic size.
- DSame oxidation state of Zr and Zn .
✓
Answer
Correct option: B.
Zr and Hf have almost same atomic size.
b
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
The element which liberates oxygen gas from water is
What is the principle of zone refining of metals?
$\underset{\begin{smallmatrix}
More\,\,reactive \\
(oxidation)
\end{smallmatrix}}{\mathop{\begin{matrix}
O \\
|| \\
H-C-H \\
\end{matrix}}}\,$$+ CH _{3}- CH $$\xrightarrow{Conc.NaoH}$
→More\,\,reactive \\
(oxidation)
\end{smallmatrix}}{\mathop{\begin{matrix}
O \\
|| \\
H-C-H \\
\end{matrix}}}\,$$+ CH _{3}- CH $$\xrightarrow{Conc.NaoH}$
Find out the products of reaction
$\begin{array}{*{20}{c}}
{C{H_3} - CHC{H_2}CHO} \\
{\,|\,\,\,\,\,\,\,\,\,\,\,\,} \\
{OH\,\,\,\,\,\,}
\end{array}$
The major product of the following reaction is
Extent of adsorption of adsorbate from solution phase increases with $......$
→Which of the following is displaced by $Fe$
→Which of the following phrases are not correctly associated with $S_{N^1}$ reaction ?
$(1)$ Rearrangement is possible
$(2)$ Rate is affected by polarity of solvent
$(3)$ The strength of the nucleophile is important in determining rate
$(4)$ The reactivity series is tertiary > secondary > primary
$(5)$ Proceeds with complete inversion of configuration
→$(1)$ Rearrangement is possible
$(2)$ Rate is affected by polarity of solvent
$(3)$ The strength of the nucleophile is important in determining rate
$(4)$ The reactivity series is tertiary > secondary > primary
$(5)$ Proceeds with complete inversion of configuration
$\underset{{{C}_{5}}{{H}_{10}}O}{\mathop{(A)}}\,\xrightarrow{{{H}_{3}}{{O}^{\oplus }}}B+C;\,(B)$ and $(C)$ both give $+ve$ iodoform test. Compound $(A)$ is
→Assertion : Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.
Reason : Alkyl halides are less reactive than acyl halides.
$100\,g$ solute is dissolved in $1400\,g$ of solvent. Density of resultant solution is $1.5\,g/mL.$ The ratio of its molarity and molality will be
→