Download App

Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
MCQ
In the lowest energy level of hydrogen atom, electron has an angular momentum equal to :
  • A
    $\frac{\pi}{\text{h}}$
  • B
    $\frac{\text{h}}{\pi}$
  • ✓
    $\frac{\text{h}}{2\pi}$
  • D
    $\frac{2\pi}{\text{h}}$
✓

Answer

Correct option: C.
$\frac{\text{h}}{2\pi}$
The angular momentum $L = \ce{m_e​vr}$ is on integer multiple of $\frac{\text{h}}{2\pi}$
$\text{mvr}=\frac{\text{nh}}{2\pi}$
For $, n = 1$
$\text{mvr}=\frac{\text{h}}{2\pi}$

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 Structure of Atom→Structure of Atom — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Which of the following processes does not involve oxidation of iron?
→
In which of the following inter molecular $H-$ bonding is present ?
→
Which of the following sets of quantum numbers represents the highest energy of an atom?
→
Electron enters the sub-shell for which $(n + l)$ value is minimum. This is enunciated as
→
True structure is predicted by :
→
The measurement of the electron position is associated with an uncertainty in momentum, which is equal to $1 \times 10^{-18} \ g \ cm \ s^{-1}.$ The uncertainty in electron velocity is (mass of an electron is $9 \times 10^{-28}\  g$)
→
The ionization enthalpy of elements decreases while moving up to down in group because:
→
In which of the following pairs A is more stable than B?

$A$                       ||                        $B$

→
The quantum numbers for the outermost electron of an element are given below as $n = 2,\,l = 0,\,m = 0,\,s = + \frac{1}{2}$. The atoms is
→
Which of the following compounds is used for water softening?
→