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11 months ago

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

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

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alok kumar singh

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11 months ago

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

The major product of the following reaction is

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Vishal Baghel

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

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11 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]

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alok kumar singh

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

E.C = [Ar] 3d³ [Ar]3d⁴

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

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11 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).

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alok kumar singh

Contributor-Level 10

$ω = Δ k . E = \frac{1}{2} m [v_{t}^{2} - v_{i}^{2}]$

$= \frac{1}{2} m {[b * 4^{5 / 2}]}^{2} - \frac{1}{2} m {[0]}^{2}$

$= \frac{1}{2} * 0.5 [0.2 5^{2} * 4^{5}] = 2^{4} = 16 J$

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11 months ago

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

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr) followed by acidic hydrosis?

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Vishal Baghel

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Kindly consider the following figure

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11 months ago

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

The number of non-ionisable protons present in the product B obtained from the following reaction is______________.

C₂H₅OH + PCl₃ ® C₂H₅Cl + A

A + PCl₃ ® B

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alok kumar singh

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$C_{2} H_{5} O H + P C l_{3} \to C_{2} H_{5} C l + H_{3} P O_{3}$

$H_{3} P O_{3} + P C l_{3} \to H_{4} P_{2} O_{5} + H C l$

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11 months ago

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

The products formed in the following reaction, A and B are

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Vishal Baghel

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Kindly consider the following figure

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11 months ago

Class 12th Dual Nature of Radiation and Matter

Given below are two statements : one is labelled as Assertion A and other is labelled as Reason R.

Assertion A : The photoelectric effect does not takes place, if the energy of the incident radiation is less than the work function of a metal.

Reason R : Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.

In the light of the above statements, chose the most appropriate answer from t

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alok kumar singh

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To free the electron from metal surface minimum energy required, is equal to the work function of that metal.

So Assertion A, is correct

have = w₀ + K.E_max

If have = w₀

Þ K.E_max = 0

Hence reas

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11 months ago

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

Which of the following compounds in not aromatic?

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Vishal Baghel

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Both indicated hydrogen atoms repel each other so due steric hinderance the given compound becomes non planar. It is non-aromatic.

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

The elevation in boiling point for 1 molal solution of non-volatile solute A is 3K. The depression in freezing point for 2 molal solution of A in the same solvent is 6 K. The ratio of K_b and K_f i.e. K_b/K_f is 1 : X. The value of X is [nearest integer]

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alok kumar singh

Contributor-Level 10

$Δ T_{b} = i K_{b} m_{1}$

$\frac{Δ T_{b}}{Δ T_{f}} = \frac{K_{b} * 1}{K_{f} * 2} \Rightarrow \frac{3}{6} = \frac{1}{2} = \frac{K_{b}}{k_{f}} * \frac{1}{2}$

$\frac{K_{b}}{K_{f}} = 1 \Rightarrow x = 1$

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