MCQ
Which of the following is paramagnetic
  • $O_2^ + $
  • B
    $C{N^ - }$
  • C
    $CO$
  • D
    ${N_2}$

Answer

Correct option: A.
$O_2^ + $
(a) $B.O. =$ $\frac{1}{2}[10 - 5] = \frac{5}{2} = 2.5$, paramagnetic

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 function of $[X]$ plotted against time, will give straight line for a second order reaction? $X \to $ Product
Given below are two statements : one is labelled as Statement-I and the other is labelled as Statement-II.
Statement-I:
$BCl _3$ is trigonal planer while $PCl _5$ is trigonal bipyramidal.
Statement-II
B in $BCl _3$ is $sp ^2$ hybridised while P in $PCl _5$ is $sp ^3 d$ hybridised.
In the light of the above statements, choose the correct answer from the options given below :
$Mn\mathop {O_4^{ - 1}}\limits_{(aq)} \, + \,8\mathop {{H^ + }}\limits_{(aq)} \, + \,5{e^ - }\, \to \, M{n^{ + 2}}(aq)\, + \,4{H_2}O(l)\,;$ $E_1^o\, = \,1.51\,\,V$

$Mn{O_2}(s)\, + \,4{H^ + }(aq)\, + \,2{e^ - }\, \to \, M{n^{ + 2}}(aq)\, + \,2{H_2}O(l)\,;$ $E_2^o\, = \,1.21\,\,V$

$MnO_4^{ - 1}(aq)\, + \,4{H^ + }(aq)\, + \,3{e^ - }\, \to \, Mn{O_2}(s)\, + \,3{H_2}O(l)\,;$ $E_3^o\,?$

value of $E_3^o$ will be ............ $\mathrm{V}$

In allene $(C_3H_4)$, the type of hybridization of the carbon atoms is (are)
When $AgN{O_3}$ is heated strongly, the products formed are
$(i)\,\,\begin{matrix}
   CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   {{(CH-OH)}_{3}}\,\,\,\,\,\,  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   \,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}\xrightarrow{4HI{{O}_{4}}} Product$ $(ii)\,\,\begin{matrix}
   C{{H}_{2}}OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   {{(CH-OH)}_{4}}\,\,\,\,\,\,  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   \,\,C{{H}_{2}}-OH\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}\xrightarrow{5HI{{O}_{4}}} Product$

Ratio of moles of formic acid obtained in reaction $(i)$ and reaction $(ii)$ is

One gas bleaches the colour of flowers by reduction while the other by oxidation, the two gases respectively are
Given below are the two statements: one is labeled as Assertion $(A)$ and the other is labeled as Reason $(R)$.

Assertion $(A)$: There is a considerable increase in covalent radius from $\mathrm{N}$ to $\mathrm{P}$. However from $As$ to $Bi$ only a small increase in covalent radius is observed.

Reason $(R)$: covalent and ionic radii in a particular oxidation state increases down the group.

In the light of the above statement, choose the most appropriate answer from the options given below:

The reagent needed for converting

$Ph - C \equiv C - Ph \to $ 

Which of the following compound is most acidic?