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Ncert Solutions Chemistry Class 12th

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Ncert Solutions Chemistry Class 12th Class 12th

Metal deficiency defect in shown by Fe_0.93O. In the crystal, some Fe²⁺ cations are missing and loss of positive charge is compensated by the presence of Fe³⁺ ions. The percentage of Fe²⁺ ions in the Fe_0.93O crystals is___________.

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alok kumar singh

Contributor-Level 10

In Fe_0.93O

Let us suppose that fraction of Fe²⁺is x and fraction of Fe³⁺ is (1 – x)

$x * (+ 2) + (1 - x) * (+ 3) =$ O.S. of Fe atom

$o r 2 x + 3 - 3 x = \frac{+ 200}{93}$

$∴ % o f F e^{2 +} = 85 % a n d % o f F e^{3 +} = 15 %$

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Ncert Solutions Chemistry Class 12th Class 12th

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alok kumar singh

Contributor-Level 10

In Fe_0.93O

Let us suppose that fraction of Fe²⁺is x and fraction of Fe³⁺ is (1 – x)

$x * (+ 2) + (1 ? x) * (+ 3) =$ O.S. of Fe atom

$o r ? ? 2 x + 3 ? 3 x = \frac{+ 200}{93}$

$? % ? ? o f ? ? F e^{2 +} = 85 % ? ? a n d ? ? % ? ? o f ? ? F e^{3 +} = 15 %$

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Ncert Solutions Chemistry Class 12th Class 12th

Arrange the following in decreasing acidic strength.

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Payal Gupta

Contributor-Level 10

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Ncert Solutions Chemistry Class 12th Class 12th

The correct order of stability for the following alkoxides is

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alok kumar singh

Contributor-Level 10

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Ncert Solutions Chemistry Class 12th Class 12th

What is the major product of the following reaction?

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Payal Gupta

Contributor-Level 10

Consider the image below

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Ncert Solutions Chemistry Class 12th Class 12th

Major product of the following reaction is

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Payal Gupta

Contributor-Level 10

Consider the image given below

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Ncert Solutions Chemistry Class 12th Class 12th

Match List I with List II:

List I (molecule)		List II (hybridization; shape)
A.	Sulphate	I.	Pesticide
B.	Fluoride	II.	Bending of bones
C.	Nicotine	III.	Laxative effect
D.	Sodium arsinite	IV.	Herbicide

Choose the correct answer form the options given below

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Payal Gupta

Contributor-Level 10

Based upon the properties and uses of chemical substances.

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Ncert Solutions Chemistry Class 12th Class 12th

Given below are two statements.

Statement I: Pig iron is obtained by heating cast iron with scrap iron.

Statement II: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer form the options given below.

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Payal Gupta

Contributor-Level 10

Cast iron is formed by pig iron and scrap iron.

Pig Iron → Carbon 4%

Cast Iron → Carbon 3%

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Ncert Solutions Chemistry Class 12th Class 12th

For micelle formation, which of the following statements are correct?

A. Micelle formation is an exothermic process.

B. Micelle formation is an endothermic process.

C. The entropy change is positive.

D. The entropy change is negative.

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Payal Gupta

Contributor-Level 10

During micelle formation, $Δ S$ is positive

Micelle formation is endothermic at low temperature and exothermic at high temperature.

At room temperature ⇒ Micelle formation is endothermic.

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Ncert Solutions Chemistry Class 12th Class 12th

The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is

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Payal Gupta

Contributor-Level 10

$\land_{M} = \frac{K * 1000}{M}$ $M_{2} = \frac{20}{(80 / 1000)}$

$\frac{\land_{M_{1}}}{\land_{M_{2}}} = \frac{M_{2}}{M_{1}}$ $M_{1} = \frac{10}{(20 / 1000)}$

$\frac{\land_{M_{1}}}{\land_{M_{2}}} = \frac{1}{2} \Rightarrow \land_{M_{2}} = 2 \land_{M_{1}}$

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