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Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

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Chemistry
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Assertion: Penicillin (G) is an antihistamine.

Reason: Penicillin (G) is effective against gram-positive as well as gram-negative bacteria.

[16] Chemistry in Everyday Life
Chapter: [16] Chemistry in Everyday Life
Concept: undefined >> undefined

Account for the following:

Aniline cannot be prepared by the ammonolysis of chlorobenzene under normal conditions.

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

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The major product of acid catalysed dehydration of 1-methylcyclohexanol is ______.

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

Write the expression of integrated rate equation for zero order reaction.

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
Concept: undefined >> undefined

A compound 'A' on reduction with iron scrap and hydrochloric acid gives compound 'B' with molecular formula C6H7N. Compound 'B' on reaction with CHCl3 and alcoholic KOH produces an obnoxious smell of carbylamine due to the formation of 'C'. Identify 'A', 'B' and 'C' and write the chemical reactions involved.

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

Give reasons for the following:

Ammonolysis of alkyl halides is not a good method to prepare pure primary amines.

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

The slope in the plot of [R] Vs. time for a zero-order reaction is ______.

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
Concept: undefined >> undefined

Which of the following would not be a good choice for reducing nitrobenzene to aniline?

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

The following experimental rate data were obtained for a reaction carried out at 25°C:

\[\ce{A_{(g)} + B_{(g)} -> C_{(g)} + A_{(g)}}\]

Initial [A(g)]/mol dm−3 Initial [B(g)]/mol dm−3 Initial rate/mol dm−3s−1
3.0 × 10−2 2.0 × 10−2 1.89 × 10−4
3.0 × 10−2 4.0 × 10−2 1.89 × 10−4
6.0 × 10−2 4.0 × 10−2 7.56 × 10−4

What are the orders with respect to A(g) and B(g)?

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
Concept: undefined >> undefined

Assertion (A): For a zero-order reaction, the unit of rate constant and rate of reaction are same.

Reason (R): Rate of reaction for zero order reaction is independent of concentration of reactant.

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
Concept: undefined >> undefined

Why is the boiling point of aldehydes and ketones lower than that of corresponding carboxylic acids?

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

Give a chemical test to distinguish between ethanal acid and ethanoic acid.

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

Amides can be converted into amines by the reaction named ______.

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

Which of the following statements is not true about glucose?

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

If the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of substance A is 0.75 M, the rate constant for the reaction if it follows zero-order kinetics is ______.

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
Concept: undefined >> undefined

What is the effect of temperature on the solubility of glucose in water?

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

Indicate the type of isomerism exhibited by the following complex and draw the structures for this isomer:

\[\ce{[Pt(NH3)(H2O)Cl2]}\]

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers: [Pt(NH3)(H2O)Cl2]

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Write short note on the following:

Ammonolysis

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

Write short note on the following:

Ammonolysis

[9] Amines
Chapter: [9] Amines
Concept: undefined >> undefined
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CBSE Science (English Medium) कक्षा १२ Question Bank Solutions
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