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
Which one of the following is paramagnetic
  • A
    $Zn^{2+}$
  • ✓
    $Ni^{2+}$
  • C
    $Cu^{+}$
  • D
    none of the above
✓

Answer

Correct option: B.
$Ni^{2+}$
b

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

The standard potential of a $Co^{+2}| Co$  electrode is $-0.28\,V$  and the standard potential of the cell  $Pt|Ti^{2+} (aq),\, Ti^{3+} (aq)||Co^{2+} (aq)|Co(s)$ is $0.09\,\,V$.  What is the standard oxidation potential of the $Ti_{{\text{(aq}}.)}^{2 + }\,\,|\,\,Ti_{{\text{(aq}}.)}^{3 + }$ electrode ? ............. $\mathrm{V}$
→
For the cell reaction......$kJ\, mol^{-1}$

$2 \mathrm{Fe}^{3+}(\mathrm{aq})+2 \mathrm{I^-}(\mathrm{aq}) \rightarrow 2 \mathrm{Fe}^{2+}(\mathrm{aq})+\mathrm{I}_{2}(\mathrm{aq})$

$\mathrm{E}_{\text {call }}^{\mathrm{e}}=0.24 \mathrm{V}$ at $298\; \mathrm{K}$. The standard Gibbs energy $\left( {{\Delta _r}{{\rm{G}}^ \ominus }} \right)$ of the cell reaction is:

[Faraday constant $\mathrm{F}=96500 \;\mathrm{C} \mathrm{mol}^{-1} $]

→
The metal $d-$ orbital that can directly facing the ligands in $K_3[Co(CN)_6]$ are
→
The hybridisation involved in $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ is?
→
Vapour pressure of methyl alcohol and ethyl alcohol solution is represented as, $P = 115 X_A+140$ where $X_A$ is the mole fraction of methyl alcohol. The value of $\mathop {Lim}\limits_{{X_A} \to 0} \,\frac{{P_B^o}}{{{X_B}}}$ is
→
Methylamine reacts with $H\ce{NO_2}$ to form $........$
→
In ammonium-phosphomolybdate, the oxidation state of Mo is ${ }^{+}$ $..........$.
→
In Dumas method for the estimation of $N _2$, the sample is heated with copper oxide and the gas evolved is passed over :
→
An organic compound undergoes first-order decomposition. The time taken for its decomposition to $1 / 8$ and $1 /$ $10$ of its initial concentration are $t _{1 / 8}$ and $t _{1 / 10}$ respectively. What is the value of $\frac{\left[1_{t / 8}\right]}{\left[ t _{1 / 10}\right]} \times 10 ?\left(\log _{10} 2=0.3\right)$
→
Based on the following information arrange four metals $A, B, C$ and $D$ in order of decreasing ability to act as reducing agents :- 

$[I]$ Only $A, B$ and $C$ react with $1\,M\,HCl$ to give $H_2\,(g)$

$[II]$ When $C$ is added to solutions of the other metal ions, metallic $B$ and $D$ are formed.

$[III]$ Metal $C$ does not reduce $A^{n+}$

→