Class 12th

The mixture of chloroxylenol and terpineol is an example of

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Antiseptic Dettol is mixture of chloroxylenol and terpineol

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2 months ago

Given are two statements one is labeled as Assertion A and other is labeled as Reason R.

Assertion A : Magnesium can reduce Al₂O₃ at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO

Reason R : The melting and boiling points of magnesium are lower thatn those of aluminium.

In light of the above statements, choose most appropriate answer for the options given below:

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Contributor-Level 9

Below 1350° C, Mg can reduce Al₂O₃ and above 1350°C, Al can reduce MgO (from Ellingham diagram).

Melting and boiling point of Mg are lower than that of Al.

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The structure of protein that is unaffected by heating is

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Primary structure of protein in unaffected by physical or chemical changes.

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The Zeta potential is related to which property of colloids?

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Potential difference between fixed layer and mobile layer of lyophobic colloid is called zeta potential or electro kinetic potential.

This potential difference is related to charge on the surface of colloidal particles.

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The incorrect statement about the imperfections in solids is:

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Density of solid decreases in Schottky defect and vacancy defect.
Density of solid increases in interstitial defect.
Density of solid remain unchanged in Frenkel defect.

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

Assertion A : Dacron is an example of polyester polymer.

Reason R : Dacron is made up of ethylene glycol and terephthalic acid monomers.

In the light of the above statements, choose the most appropriate answer from the options given below.

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Class 12th Physics Ncert Solutions Class 12th

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A telegraph line of length 100km has a capacity of $0.01 μ F / k m$ and it carries an alternating current at 0.5 kilo cycle per second. If minimum impedance is required, then the value of the inductance that need to be introduced in series is _________mH.

(if p = $\sqrt[]{10}$ )

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C = 10^-6 f

f = 0.5 * 10³ = 500

$z = \sqrt[]{x_{R}^{2} + {(x_{L} - x_{C})}^{2}}$

for minimum impedance :

x_L = x_C

$\Rightarrow ω^{2} = \frac{1}{L C}$

$\Rightarrow L = \frac{1}{π^{2}} = \frac{1}{10} * 1000 = 100 m H$

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2 months ago

In Friedel-Crafts alkylation of aniline, one gets

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Class 12th Physics Moving Charges and Magnetism

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Aniline show acid-base reaction with AlCl₃

aniline is a Lewis base while AlCl₃ acts as lewis acid.

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Class 12th Physics

(if p = $\sqrt[]{10}$ )

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2 months ago

A singly ionized magnesium atom (A = 24) ion is accelerated to kinetic energy 5 ke V, and is projected perpendicularly into a magnetic field B of the magnitude 0.5 T. The radius of path formed will be ________cm.

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