Chemistry

Chemistry Chemistry Hydrocarbon

Contributor-Level 9

λ° (BaCl? ) = 280 Scm²mol? ¹
λ° (H? SO? ) = 860 Scm²mol? ¹
λ° (HCl) = 426 Scm²mol? ¹
λ° (BaSO? ) = λ° (BaCl? ) + λ° (H? SO? ) - 2λ° (HCl)
= 280 + 860 - 2 * 426
= 288 Scm² mol? ¹

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6 months ago

An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with ammonical silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon X is:

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Chemistry Chemistry Some Basic Concepts of Chemistry

Contributor-Level 10

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6 months ago

10.0 mL of Na?CO? solution is titrated against 0.2 M HCl solution.
The following titre values were obtained in 5 readings:
4.8 mL, 4.9 mL 5.0 mL, 5.0 mL and 5.0 mL
Based on these readings, and convention of titrimetric estimation the concentration of Na?CO? solution is ________ mM. (Round off to the nearest integer).

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Contributor-Level 9

V (Na? CO? ) = 10 mL
Volume of HCl used will be 5 mL (average of titre values)
Meq of HCl = meq of Na? CO?
(M * n-factor * V)HCl = (M * n-factor * V)Na? CO?
0.2 * 1 * 5 = M * 2*10
M= 0.05 M
M= 50 mM

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6 months ago

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH?)?]? per aldehyde group to form silver mirror is ________. (Round off to the nearest integer).

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Contributor-Level 9

In Tollen's test for aldehyde, aldehyde is oxidized to carboxylic acid salt as:
R – CHO + H? O →R – COO? + 3H? + 2e?
So; 2e? are transferred per aldhyde group.

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6 months ago

Kindly consider the following

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Contributor-Level 10

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6 months ago

A xenon compound 'A' upon partial hydrolysis gives XeO?F?. The number of lone pair of electrons present in compound A is ________. (Round off to the nearest integer).

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Chemistry Chemistry Chemical Bonding and Molecular Structure

Contributor-Level 9

Partial hydrolysis of XeF? gives XeO? F?
XeF? + 2H? O → XeO? F? + 4HF
Compound A is XeF? , so number of lone pair on Xe is 1.

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6 months ago

The number of species below that have two lone pairs of electrons in their central atom is ________. (Round off to the nearest integer).
SF?, BF?, ClF?, AsF?, PCl?, BrF?, XeF?, SF?

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Contributor-Level 9

ClF? and XeF? have two lone pairs of electrons on central atom.

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6 months ago

Which of the following reduction reaction CANNOT be carried out with coke?

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Contributor-Level 10

The reduction of aluminum oxide (Al? O? ) is performed through an electrolytic process in its molten state. This method is necessary because Al? O? is a highly ionic and stable compound.

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6 months ago

A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52°C. The percentage association of A is ________. (Round off to the nearest integer).
[ Use: K? for water = 0.52 K kg mol?¹, Boiling point of water = 100°C]

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Contributor-Level 9

m=2 molal
ΔT? = 100.52 – 100 = 0.52°C
Using, ΔT? = iK? m
0.52 = I * 0.52 * 2
i = 0.5
Now using, α = (1-i) / (1-1/n)
Where, n=2 (dimerisation)
α = (1-0.5) / (1-0.5) = 1
So, percentage association = 100%

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6 months ago

The INCORRECT statement regarding the structure of C₆₀ is:

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