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Class 12th Chemistry

Given below are the critical temperature of some of the gases:

Gas	Critical temperature (K)
He	5.2
CH₄	190.0
CO₂	304.2
NH₃	405.5

The gas showing least adsorption on a definite amount of charcoal is

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Payal Gupta

Contributor-Level 10

Higher adsorbtion of gas is corresponds to higher liquefaction and higher liquefaction is directly proportional to the higher critical temperature.

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Class 12th Chemistry

An antiseptic dettol is a mixture of two compounds 'A' and 'B' where A has 6π electrons and B has 2π electrons. What is 'B'?

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Vishal Baghel

Contributor-Level 10

Dettol is a mixture of

(B) is Terpineol.

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Class 12th Chemistry

Which of the following ketone will NOT give enamine on treatment with secondary amine?

[Where t-Bu is -C(CH₃)₃]

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Vishal Baghel

Contributor-Level 10

Enolisable carbonyl compound gives enamine with 2° amine.

Does not form enol thus not form enamine.

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Class 12th Chemistry

The major product formed in the following reaction, is

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Class 12th Chemistry

Which of the following condition or reaction sequence will NOT given acetophenone as the major product?

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Class 12th Chemistry

In the given reaction

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Class 12th Chemistry

Amongst the following, the major product of the given chemical reaction is

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Vishal Baghel

Contributor-Level 10

Kindly comsider the following figure

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Class 12th Organic Chemistry - Some Basic Principles and Tech

During halogens test, sodium fusion extract is boiled with concentrated HNO₃ to

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Vishal Baghel

Contributor-Level 10

Sodium fusion extract is boiled with conc. HNO₃ to remove NaCN and Na₂S.

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8 months ago

Class 12th Physics

In a series LCR circuit, the inductance, capacitance and resistance are L = 100mH, C = $100 μ F$ and R = $10 Ω$ respectively. They are connected to an AC source of voltage 220V and frequency of 50 Hz. The approximate value of current in the circuit will be……….A.

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alok kumar singh

Contributor-Level 10

$ω = 2 π f = 2 π * 50 = 100 π$

$X_{L} = w L = 100 π * 100 * 1 0^{- 3}$

$X_{C} = \frac{1}{w C} = \frac{1}{100 π} * 100 * 1 0^{- 6} = \frac{100}{π}$

$z = 10.0086 Ω$

$l = \frac{v}{z} = \frac{220}{10.008} = 22 A$

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Class 12th Chemistry Organic Chemistry

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

Assertion A: A mixture contains benzoic acid and naphthalene. THE pure benzoic acid can be separated out by the use of benzene.

Reason R: Benzoic acid is soluble in hot water.

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

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Vishal Baghel

Contributor-Level 10

Benzoic acid & naphthalene can be separated by crystallization. Benzoic acid is soluble is hot water but naphthalene is insoluble.

Assertion is incorrect & Reason is correct.

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