Download App

4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
The trivalent ion having largest size in following is
  • A
    $Ti$
  • B
    $Zr$
  • C
    $Hf$
  • ✓
    $La$
✓

Answer

Correct option: D.
$La$
d
The Lanthanide series starts from $La$ and thus $La ^{3+}$ will have the largest size because we know on moving across the period from left to right the size decreases in Lanthanide and thus the same will be similar for the trivalent ions.

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

Explore more

More "M.C.Q (1 Marks)" from 4. d and f- block elements→4. d and f- block elements — all question types→Chemistry STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Glucose and Fructose can be differentiated by
→
An ore of tin containing $\mathrm{FeCrO}_4$​ is concentrated by:
→
The electrode potential of the following half cell at $298\,K$

$X \left| X ^{2+}(0.001 M ) \| Y ^{2+}(0.01 M )\right| Y$

is $.......\times 10^{-2} V$ (Nearest integer).

Given: $E _{ x ^{2+} \mid x }^0=-2.36\,V$

$E _{ Y ^{3+} \mid Y }^0=+0.36\,V$

$\frac{2.303\,RT }{ F }=0.06\,V$

→
$\begin{gathered}
  \begin{array}{*{20}{c}}
  {O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - {\text{  }}C - {\text{ }}O - H\xrightarrow{{NaH{{\mathop {CO}\limits^{14} }_3}}}\mathop {(A)}\limits_{(gas)} \xrightarrow[{(ii){H_3}{O^ \oplus }}]{{(i)PhMgBr}}(B)} 
\end{array} \hfill \\
  \begin{array}{*{20}{c}}
  {O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - S - O - H\xrightarrow{{NaH\mathop {C{O_3}}\limits^{14} }}\mathop {(C)}\limits_{(gas)} \xrightarrow[{(ii){H_3}{O^ \oplus }}]{{(i)PhMgBr}}(D)} \\ 
  {||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array} \hfill \\ 
\end{gathered}$

Product $(B)$ and $(D) $ in the above reaction are

→
A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with $\mathrm{NH}_3$ an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from $........$
→
For the hypothetical reaction $2X + G \to Q + 2M$ , the rate expression is $\frac{{d\left[ Q \right]}}{{dt}} = k{\left[ X \right]^2}$ . Which of the following is the most likely mechanism ?
→
$B{r_2}$ gas turns starch iodide paper
→
Glyoxal $(CHOCHO)$ on being heated with concentrated $NaOH$ forms.
→
The standard electrode potentials $(E^o)$ for  $OCl^-/Cl^-$ and $\frac{1}{2}C{l_2}/C{l^ - }$ are $0.94\,V$ and $+1.36\,V$ respectively, the $E^o$ value for $OCl^-/\frac{1}{2}Cl_2$ will be ........... $\mathrm{V}$
→
The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows:
→