MCQ
The one which is unimolecular reaction is
  • A
    $2HI \to {H_2} + {I_2}$
  • ${N_2}{O_5} \to {N_2}{O_4} + \frac{1}{2}{O_2}$
  • C
    ${H_2} + C{l_2} \to 2HCl$
  • D
    $PC{l_3} + C{l_2} \to PC{l_5}$

Answer

Correct option: B.
${N_2}{O_5} \to {N_2}{O_4} + \frac{1}{2}{O_2}$
b
(b)Because in this reaction one molecule of ${N_2}{O_5}$ is used.

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

Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are
For the reaction:$N{H_4}HS(s) \,\rightleftharpoons\,N{H_3}(g) + {H_2}S(g)$, the observed pressure of reaction mixture at equilibrium is $1.4$ $atm$ at $110\,^oC$. Value of $K_p$ for the reaction is .....$atm^2$
For the reaction $FeC{O_{3(s)}} \to Fe{O_{(s)}} + C{O_{2(g)}}$ $\Delta H=82.8\,kJ$ at $25\,^oC$. What is $\Delta U$ at $25\,^oC$ ? .......$kJ$
Racemic mixture is obtained due to halogenation of :
The $IUPAC$ name of $\begin{matrix}
   C{{H}_{2}}-CH=CH-CHO  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$ is
Given below are two statements: One is labelled as 
Assertion A and the other is labelled as Reason R:
Assertion A: $pK _{ a }$ value of phenol is 10.0 while that of ethanol is 15.9.
Reason R: Ethanol is stronger acid than phenol. 
In the light of the above statements, choose the correct answer from the options given below: 
A button cell used in watches function as following.

$Zn_{(s)} + Ag_2O_{(s)} + H_2O_{(l)} \rightleftharpoons  $$2Ag_{(s)} + Zn^{2+}_{(aq)}+ 2OH^-_{(aq)}$

If half cell potentials are

$Zn^{2+}_{(aq)} + 2e^- \rightarrow Zn_{(s)}\,;\,\, E^o = - 0.76\, V$

$Ag_2O_{(s)} + H_2O_{(l)} + 2e^- \rightarrow 2Ag_{(s)} + 2OH^-_{(aq)}\,,$$E^o = 0.34\, V$

The cell potential will be ........... $V.$

Which of the following shape can not be obtained from trigonal bipyramidal geometry
Configuration of the following compound is
$Br_2 + 2{X^-}_{aq} \to X_2 + 2{Br^-}_{aq}$ above reaction is correct when $X^-$ is :