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

Which one of the following is an example of disproportionation reaction?

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Vishal Baghel

Contributor-Level 10

Disproportionation reaction is

$\overset{+ 6}{M g} O_{4}^{- -} + 4 H^{+} \to 2 \overset{+ 7}{M n} O_{4}^{-} + \overset{+ 4}{M n} O_{2} + 2 H_{2} O$

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

The oxide which contains an odd electron at the nitrogen atom is

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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11 months ago

Class 12th Biomolecules

Given below are two statements:

Statement I: In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to given NaCN and Na₂S.

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

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Payal Gupta

Contributor-Level 10

Regarding Lassaigne's Test, both statement are correct.

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11 months ago

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

s-block element which cannot be qualitatively confirmed by the flame test is

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Vishal Baghel

Contributor-Level 10

Be does not perform in flame colouration due to highly ionization energy.

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11 months ago

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

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

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Vishal Baghel

Contributor-Level 10

During removal of temporary hardness of water.

$\begin{array}{l} M g {(H C O_{3})}_{2} \overset{B o i l}{\to} M g {(O H)}_{2} + 2 C O_{2} ↑ \\ C a {(H C O_{3})}_{2} \overset{B o i l}{\to} C a C O_{3} + H_{2} O + C O_{2} \end{array}$

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11 months ago

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

The role depressants in 'Froth Floatation method' is to

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Vishal Baghel

Contributor-Level 10

In sulphide ore, depressants selectively prevent impurity from coming to the fourth.

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11 months ago

Class 12th physics ncert exemplar solutions class 12th chapter two

Velocity $(υ)$ and acceleration (a) in two system of units 1 and 2 are related as $υ_{2} = \frac{n}{m^{2}} υ_{1} a n d a_{2} = \frac{a_{1}}{m n}$ respectively. Here m and n are constants. The relations for distance and time in two system respectively are:

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alok kumar singh

Contributor-Level 10

Let, L₁ & L₂ one distance for system (1) & (2) respectively

T₁ & T₂ are time for system (1) & (2) respectively

Given : v2 = $\frac{n}{m^{2}} v_{1}$

$\Rightarrow (\frac{L_{2}}{T_{2}}) = \frac{n}{m_{2}} (\frac{4}{T_{1}})$ $[? v_{2} = \frac{L_{2}}{T_{2}}, v_{1} = \frac{L_{1}}{T_{1}}]$

$\Rightarrow \frac{L_{2}}{L_{1}} = (\frac{n}{m_{2}}) [\frac{T_{2}}{T_{1}}] - - (i)$

And a2 = $\frac{a_{1}}{m n} \Rightarrow \frac{v_{2}}{T_{2}} = \frac{v_{1}}{T_{1} m n}$

$\Rightarrow \frac{T_{1}}{T_{2}} = \frac{v_{1}}{v_{2}} (\frac{1}{m n})$ $[? \frac{v_{1}}{v_{2}} = \frac{m^{2}}{n}]$

$\Rightarrow \frac{n^{2}}{m} T_{1} = T_{2}$

from (1)

$\frac{L^{2}}{L_{1}} = \frac{n}{m^{2}} [\frac{n^{2}}{m}] [? \frac{T_{2}}{T_{1}} = \frac{n^{2}}{m}]$

$\Rightarrow \frac{n^{3}}{m^{3}} L_{1} = L_{2}$

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11 months ago

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

Which of the following elements is considered as a metalloid?

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Vishal Baghel

Contributor-Level 10

Except Te, all are metals.

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11 months ago

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

Match List I with List II

List I Enzyme	List II Conversion of
A. Invertase	I. Starch into maltose
B. Zymase	II. Maltose into glucose
C. Diastase	III. Glucose into ethanol
D. Maltase	IV. Cane sugar into glucose

Choose the most appropriate answer from the options given below:

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Vishal Baghel

Contributor-Level 10

Invertase Cane sugar to glucose and fructose

Zymase Glucose to ethanol

Diastase Starch to Maltose

Maltase Maltose to glucose

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11 months ago

Class 12th Amines

Polar stratospheric clouds facilitate the formation of

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Payal Gupta

Contributor-Level 10

HOCl produce in the stratospheric cloud, by the hydrolysis reaction of ClONO₂.

$C l O N O_{2 (g)} + H_{2} O_{(g)} \to H O C l_{(g)} + H N O_{3 (v a p)}$

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