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9 months ago

Chemistry Class 11th

The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]

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alok kumar singh

Contributor-Level 10

$S (g) + 6 F (g) \to S F_{6} (g)$

$Δ {H^{0}}_{R} = Δ {H^{0}}_{f} (S F_{6}) - Δ {H^{0}}_{f} (S) - 6 * Δ {H^{0}}_{f} (F)$

= (-1100) - (275) -6 (80) = -1855

$Δ {H^{0}}_{S - F} = \frac{1855}{6} = 309.16 K J / m o l ≅ 309$

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9 months ago

Chemistry Biomolecules

Seliwanoff test and Xanthoproteic test are used for the identification of………. and………. respectively.

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alok kumar singh

Contributor-Level 10

Seliwanoff's test is used to distinguish carbohydrates while xanthoproteic test is used to distinguish proteins

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9 months ago

Chemistry Class 11th

Which pair oxides in acidic in nature?

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alok kumar singh

Contributor-Level 10

Oxide Nature

CaO Basic

B₂O₃ Acidic

SiO₂ Acidic

BaO Basic

N₂O

...more

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9 months ago

Chemistry Chemical Bonding and Molecular Structure

Match List-I with List-II.

List-I List-II

(Molecule) &nb

...more

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alok kumar singh

Contributor-Level 10

Species B.O

Ne₂ 0

N₂ 3

F₂ 1

O₂ 2

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9 months ago

Chemistry Class 12th

Considering the above reaction, the major product among the following is:

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alok kumar singh

Contributor-Level 10

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9 months ago

Chemistry Class 12th

2,4-DNP test can be used to identify:

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alok kumar singh

Contributor-Level 10

2, 4-DNP (Brady's Reagent) is used to test carbonyl compound

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9 months ago

Chemistry Class 12th

Match List – I with List – II.

List – I List – I

(A) Sodium Carbonate &n

...more

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alok kumar singh

Contributor-Level 10

(a) Na₂CO₃ -> Solvay

(b) Ti -> Van-Arkel

(d) NaOH -> Castner – kellner

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9 months ago

Chemistry Class 12th

Identify A in the given chemical reaction .

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alok kumar singh

Contributor-Level 10

It is an intramolecular aldol condensation

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9 months ago

Chemistry Class 12th

A. Phenyl methanamine

B. N, N-Dimethylaniline

C. N-Methyl aniline

D. Benzenamine

Choose the correct order of basic nature of the above amines.

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alok kumar singh

Contributor-Level 10

A > B > C > D

Lone pair is localized in (A) while all 3 have delocalized lone pair but they can be compared by 3° > 2° > 1° because methyl group increases the basicity.

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9 months ago

Chemistry Class 11th

The correct order of electron gain enthalpy is:

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

S > Se > Te > O

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