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11 months ago

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

Which of the following in NOT an example of synthetic detergent?

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Vishal Baghel

Contributor-Level 10

CH₃ – (CH₂)₁₆ – COONa is the sodium salt of fatty acid used in soap is not synthetic detergent.

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11 months ago

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

The final product 'C' in the following series of reactions

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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11 months ago

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

A water drop of radius $1 μ m$ falls in a situation where the effect of buoyant force is negligible. Co-efficient of viscosity of air is 1.8 * 10^-⁵ Nsm^-² and its density is negligible as compared to that of water 10⁶ gm^-³. Terminal velocity of the water drop is:

(Take acceleration due to gravity = 10 ms^-²)

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alok kumar singh

Contributor-Level 10

NLM 1

$ρ_{ω} \frac{4}{3} π r^{3} g = 6 π η r V_{T}$

$\frac{ρ_{ω} 4}{3} π r^{2} g =$ $6 π η v_{T}$

$V_{T} = \frac{4}{3} \frac{ρ_{ω} π r^{2} g}{6 π η}$

$= \frac{2}{9} * 1 0^{3} * \frac{{(1 0^{- 6})}^{2} * 10}{1.8 * 1 0^{- 5}}$

$= 0.1234 * 1 0^{- 3}$

vT = 123.4 * 10^-6m/sec

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11 months ago

Class 12th Redox Reactions

Among the following structure, which will show the most stable enamine formation?

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Payal Gupta

Contributor-Level 10

Enamines are inter conversible and have low stability with respect to imine. Among all C is most stable due to steric factor.

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11 months ago

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

Which statement is NOT correct for p- toluenesulphonyl chloride?

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Vishal Baghel

Contributor-Level 10

p- toluenesulphonyl chloride

Only gives soluble product with alkali for 1° amine and for 2°- amine it gives insoluble product.

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11 months ago

Class 12th Equilibrium

Which will have the highest enol content?

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Payal Gupta

Contributor-Level 10

Aromaticity drives the highest enolic percentage of given structure:

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11 months ago

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

The final product 'A' in the following reaction sequence

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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11 months ago

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

Two objects of equal masses placed at certain from each other attracts each other with a force of F. If one-third mass of one object is transferred to the other, then the new force will be:

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alok kumar singh

Contributor-Level 10

F = $\frac{G m_{2}}{d^{2}}$ - (i)

Now, $F' = \frac{G m_{1} m_{2}}{d^{2}} = \frac{G 2 m}{3} * \frac{4 m}{3 d^{2}}$

$k' = \frac{8}{9} G \frac{m^{2}}{d^{2}}$

$∴ F' = \frac{8}{G} F$

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11 months ago

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

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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11 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Six

Water falls from a 40m height dam at the rate of 9 * 10⁴ kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit, is:

(Take g = 10 ms^-2)

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alok kumar singh

Contributor-Level 10

Given : water flow rate = $(\overset{o}{m})$ = 9 * 10⁴kg/hr

= $\frac{9 * 1 0^{4} k g / s e c}{60 * 60}$

Potential energy available on water per unit time

$\Rightarrow \overset{o}{m} g h = \frac{9 * 1 0^{4}}{60 * 60} * 10 * 40$

$\overset{o}{m} g h = 1 0^{4} w a t t$

50% of it converts into electrical energy = 50% of $\overset{o}{m} g h = \frac{1 0^{4}}{2} w a t t$

Let $η$ be the number of bulbs n = 100 = $\frac{1 0^{4}}{2}$

n = 50

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