Download App

MODEL PAPER 5 — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 51 Mark
MCQ
The unit of rate constant for a first order reaction is
  • A
    $Mol/L$
  • B
    $Mol/L/s$
  • C
    $Mol^2/L^2/s^2$
  • ✓
    $s^{-1}$
✓

Answer

Correct option: D.
$s^{-1}$
unit of rate constant for nth order reaction $(k) = (mol \ L^{-1})^{1-n} 8^{-1}$
put, $n=1;$
unit of rate constant for 1st order reaction $(k) = s^{-1}$

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 MODEL PAPER 5→MODEL PAPER 5 — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Glucose does not react with
→
The oxidation number of cobalt in $\mathrm{K}\left[\mathrm{Co}(\mathrm{CO})_4\right]$ is:
→
Chlorobenzene is formed by reaction of chlorine with benzene in the presence of $\ce{AlCl_3}.$ Which of the following species attacks the benzene ring in this reaction?
→
$Y\, g$ of non-volatile organic substance of molecular mass $M $ is dissolved in $250\,g$ benzene. Molal elevation constant of benzene is $K_b.$ Elevations in it's boiling point is given by -
→
Resistance of a decimolar solution between two electrodes $0.02\,\,meter$ apart and $0.0004\,\, m^2$ in area was found to be $50\,\, ohm.$ Specific conductance $(k)$ is .......... $\mathrm{S\,m}^{-1}$
→
The possible van't Hoff factor for sodium chloride in water assuming sodium chloride is partially ionized:
→
Assertion : Molecular mass of benzoic acid when determined by colligative properties is found high

Reason : Dimerisation of benzoic acid.

→
The rate coefficient $(k)$ for a particular reactions is $1.3 \times 10^{-4}\,M^{-1}\, s^{-1}$ at $100\,^oC,$ and $1.3 \times 10^{-3}\,M^{-1}\,s^{-1}$ at $150\,^oC$. What is the energy of activation $(E_A)$ (in $kJ$ ) for this reaction? ( $R =$ molar gas constant $= 8.314\,JK^{-1}\,mol^{-1}$ )
→
Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule. Which of the following are acidic?
$a. (\text{CH}_{3})_{2}\text{CH}-\text{CH}-\text{COOH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{NH}_{2}$
$b. \text{HOOC}-\text{CH}_{2}-\text{CH}_{2}-\text{CH}-\text{COOH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{NH}_{2}\\ \ \ \ \ \ $
$c. \text{H}_{2}\text{N}-\text{CH}_{2}-\text{CH}_{2}-\text{CH}_{2}-\text{COOH}$
$d. \text{HOOC}-\text{CH}_{2}-\text{CH}-\text{COOH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{NH}_{2}\\ \ \ \ \ \ $
→
$(A)\xrightarrow[{\begin{array}{*{20}{c}}
  {(2){\kern 1pt} A{g_2}O/{H_2}O} \\ 
  {(3){\kern 1pt} \Delta } 
\end{array}}]{{(1){\kern 1pt} \,excess\,{\kern 1pt} C{H_3}I/{K_2}C{O_3}}}(B)$ $\xrightarrow[{(iii){\kern 1pt} \Delta }]{{\begin{array}{*{20}{c}}
  {(i){\kern 1pt} excess{\kern 1pt} C{H_3}I/{K_2}C{O_3}} \\ 
  {(ii){\kern 1pt} A{g_2}O} 
\end{array}}}$ $\begin{array}{*{20}{c}}
  {{H_2}C = CH - CH - CH = C{H_2}} \\ 
  {|{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \,\,\,\,\\ 
  {{\mkern 1mu} {\mkern 1mu} C{H_3}} 
\end{array}$

Identify $A$

→