Chemistry

The statement that is INCORRECT about Ellingham diagram is:

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Contributor-Level 10

Ellingham Diagram doesn't give idea about of rate of reaction.

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4 months ago

0.8 g of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then __________ ml. of 1 M H₂SO₄ would have been neutralized by the ammonia evolved during the analysis.

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Contributor-Level 10

% of N = (1.4 * Normality of acid * volume of acid used) / (mass of organic compound)
42 = (1.4 * (1 * 2) * volume of acid used) / 0.8
Volume of acid used = (42 * 0.8) / (1.4 * 2) ml

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4 months ago

The product obtained from the electrolytic oxidation of acidified sulphate solutions, is:

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Contributor-Level 10

Main product of electrolysis of conc. H? SO? is H? S? O? i.e. HO? SO-OSO? H

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4 months ago

Chemistry Class 11th

A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is __________ J. (Nearest integer)

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Contributor-Level 10

q = +150 J
w = -200 J
∴ ΔU = q + w = 150 - 200 = -50 J
So, magnitude of ΔU is 50 J.

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4 months ago

Chemistry Environmental chemistry

Which one of the following compounds will liberate CO?, when treated with NaHCO?

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Raj Pandey

Contributor-Level 9

(CH? )? N? HCl produces H? which reacts with NaHCO? and CO? gas evolved, because HCl is stronger acid than H? CO?

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4 months ago

Which one of the following statements is NOT correct?

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Contributor-Level 10

It is process in which nutrient enriched water bodies support a dense plant population which kills animal life by depriving it of oxygen and result in subsequent loss of biodiversity is known as Eutrophication.

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4 months ago

Chemistry Solutions

When 3.00 g of substance 'X" is dissolved in 100 g of CCl₄, it raises the boiling point by 0.60K. The molar mass of the substance 'X" is __________g mol⁻¹. (nearest integer)
[Given Kb for CCl₄ is 5.0 K kg mol⁻¹]

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Contributor-Level 10

ΔTb = 0.6 K
ΔTb = Kb * m = Kb * (wt. * 1000)/ (mol wt. * Wsolvent (gm)
0.6 = 5 * (3 * 1000)/ (mol wt. * 100)
∴ mol wt. = (15 * 10)/ (0.6) = 1500/6
= 250 g/mole

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4 months ago

Chemistry Class 11th

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Lithium halides are some what covalent is nature.
Reason R: Lithium possess high polarisation capability.
In the light of the above statements, choose the most appropriate answer from the options given below:

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Contributor-Level 10

Due to small size Li have more polarizing power so most of the compound of Li are covalent.

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4 months ago

Chemistry Chemistry Chemical Kinetics

Which one of the following species responds to an external magnetic field?

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Raj Pandey

Contributor-Level 9

(CH?)?N?HCl produces H? which reacts with NaHCO? and CO? gas evolved, because HCl is stronger acid than H?CO?

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4 months ago

For a chemical reaction A→B, it was found that concentration of B is increased by 0.2 mol L⁻¹ in 30 min. The average rate of the reaction is __________ *10⁻¹ mol L⁻¹ h⁻¹. (in nearest integer)

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