Tags Class 12th

Class 12th

Get insights from 12k questions on Class 12th, answered by students, alumni, and experts. You may also ask and answer any question you like about Class 12th

Follow Ask Question

12k

Questions

Discussions

Active Users

Followers

New answer posted

6 months ago

Class 12th Physics Moving Charges and Magnetism

A charge particle moves along circular path in a uniform magnetic field in a cyclotron. The kinetic energy of the charge particle increases to 4 times its initial value. What will be the ratio of new radius to the original radius of circular path of the charge particle:

0 Follower 2 Views

alok kumar singh

Contributor-Level 10

$\sqrt[]{k \cdot E}$

$\frac{r_{f}}{r_{0}} = \frac{\sqrt[]{k . E_{f}}}{k . E_{i}}$

$\frac{r_{f}}{r_{0}} = \frac{\sqrt[]{4 k . E_{i}}}{\sqrt[]{k . E_{i}}}$

$\frac{r_{f}}{r_{0}} = \frac{2}{1} = 2 : 1$

0 0

New answer posted

6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten

A 100 mL solution of CH₃CH₂MgBr on treatment with methanol produces 2.24 mL of a gas at STP. The weight of gas produced is __________ mg. [nearest integer]

0 Follower 25 Views

alok kumar singh

Contributor-Level 10

Moles of C₂H₆ = $\frac{2.24 * 1 0^{- 3}}{22.4} = 1 0^{- 4}$

Weight of C₂H₆ = 10^-4 * 30 = 3 mg

0 0

New answer posted

6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The correct stability order of the following diazonium salt is

0 Follower 6 Views

Vishal Baghel

Contributor-Level 10

Electron donating group increases stability of diazonium salt. Whereas electron with drawing group decrease it.

-OCH₃ (+M), -NO₂ & -CN (-M)

0 0

New answer posted

6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Twelve

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is_______________.

0 Follower 10 Views

alok kumar singh

Contributor-Level 10

0 0

New answer posted

6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter One

The major product of the following reaction is

0 Follower 37 Views

Vishal Baghel

Contributor-Level 10

Birch reduction takes place of carbon connected with electron withdrawing group (-NO₂)

0 0

New answer posted

6 months ago

Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF₄, MnF₃ and MnF₂ is_________B.M [nearest integer]

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

$\overset{+ 4}{M n F_{4}}$ $\overset{+ 3}{M n F_{3}}$

E.C = [Ar] 3d³ [Ar]3d⁴

$\begin{matrix} \overset{+ 2}{M n F_{2}} & [A r] 3 d^{5} \end{matrix} [\begin{array}{l} E_{M n^{3 +} | M n^{2 +}}^{0} = 1.57 V \\ E_{M n^{4 +} | M n^{2 +}}^{0} = 1.27 V \end{array}]$

0 0

New answer posted

6 months ago

Class 12th Work, Energy and Power

A particle of mass 500 gm is moving in a straight line with velocity = The work done by the net force during its displacement from x = 0 to x = 4m is:

(Take b = 0.25m^-3/2s^-1).

0 Follower 2 Views