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Class 11th Chemistry Organic Chemistry

In chromatography technique, the purification of compound is independent of:

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Raj Pandey

Contributor-Level 9

Purification of a compound is independent of the physical state of the pure compound in chromatography techniques.

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3 months ago

Class 11th Chemistry Chemical Bonding and Molecular Structure

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The H-O-H bond angle in water molecule is 104.5°.
Reason R: The lone pair- lone pair repulsion of electrons is higher than the bond pair- bond pair repulsion.
In the light of the above statements, choose the correct answer from the options given below:

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Raj Pandey

Contributor-Level 9

H? O has a tetrahedral geometry and a bent shape with a bond angle of 104.5°, which is smaller than 109.5°. This is because of the presence of two lone pairs in H? O.

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Class 11th Chemistry Hydrocarbon

Which of the following is Lindlar catalyst?

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Raj Pandey

Contributor-Level 9

Partially deactivated palladised charcoal is Lindlar's reagent.

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Class 11th Chemistry

Match List – I with List – II:

List – I List – II

Industrial process &

...more

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Raj Pandey

Contributor-Level 9

(a) Haber's process is used for the synthesis of NH?
(b) Ostwald's process is used to synthesize HNO?
(c) Contact process is used for the synthesis of H? SO?
(d) Hall-Héroult process is used for the extraction of aluminium.

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Class 11th Chemistry

Among the following, the aromatic compounds are:

Choose the correct answer from the following options:

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Raj Pandey

Contributor-Level 9

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4 months ago

Class 11th Chemistry

At 25°C, 50 g of iron reacts with HCl to form FeCl?. The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by the gas during this expansion is __________ J. (Round off to the nearest integer).
[Given: R= 8.314 J mol?¹ K?¹. Assume hydrogen is an ideal gas]
[Atomic mass of Fe is 55.85u]

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alok kumar singh

Contributor-Level 10

The reaction is Fe (s) + 2HCl (aq) → FeCl? (aq) + H? (g). 50 g of Fe corresponds to 0.89 moles, which produces 0.89 moles of H? (g). The work done by the gas is calculated using W = -Δn_gasRT. The work done by the gas is the positive value, 2218 J.
Answer: 2218 J

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4 months ago

Class 11th Chemistry Organic Chemistry

In Duma's method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg pressure. The percentage composition of nitrogen in the compound is __________. (Round off to the nearest integer).
[Given: Aqueous tension at 287K = 14 mm of Hg]

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alok kumar singh

Contributor-Level 10

The partial pressure of dry N? is 758 - 14 = 744 mm Hg. Using the ideal gas law (PV=nRT), the moles of N? are calculated to be 1.25 * 10? ³ mol. This corresponds to 0.035 g of N? The percentage of nitrogen in the sample is (0.035 g / 0.1840 g) * 100, which is 18.96%.
Answer: 19 (Rounded)

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4 months ago

Class 11th Structure of Atom

The number of orbitals with n=5, m? = +2 is __________

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