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Science (English Medium) Class 12 - CBSE Question Bank Solutions

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What structural change will occur when a native protein is subjected to change in pH?

[10] Biomolecules
Chapter: [10] Biomolecules
Concept: undefined >> undefined

Ibrahim collected 10 mL each of fresh water and ocean water. He observed that one sample labeled “P” froze at 0° C while the other “Q” at -1.3° C. Ibrahim forgot which of the two, “P” or “Q” was ocean water. Help him identify which container contains ocean water, giving rationalization for your answer.

[1] Solutions
Chapter: [1] Solutions
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The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in the freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in the freezing point of water observed for the same amount of acetic acid, trichloroacetic acid, and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in the freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

Indicate the σ and π bond in the following molecule:

HCONHCH3

[7] Alcohols, Phenols and Ethers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: undefined >> undefined

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10−2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.

(R = 0.0821 L atm K−1 mol−1, Molar mass of K2SO4 = 174 g mol−1)

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

Give the structures of A, B and C in the following reactions:

[9] Amines
Chapter: [9] Amines
Concept: undefined >> undefined

Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. Give two reasons.

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

How would you account for the following:

The chemistry of actinoids is more complicated as compared to lanthanoids.

[4] d-block and f-block Elements
Chapter: [4] d-block and f-block Elements
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Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

CuCN/KCN

[9] Amines
Chapter: [9] Amines
Concept: undefined >> undefined

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

H2O

[9] Amines
Chapter: [9] Amines
Concept: undefined >> undefined
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