NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 574 - 578 of 1258

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Question number: 574

» Chemical Kinetics » Activation Energy

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MCQ▾

Question

The rate of reaction can be increased in general by all the following factors expect?

Choices

Choice (4) Response

a.

By increasing the concentration of reactants

b.

By increasing the temperature

c.

By increase in activation energy

d.

Using a suitable catalyst

Question number: 575

» Chemical Kinetics » Rate Constant and Its Units

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MCQ▾

Question

Find out the order of reaction and rate constant of following reaction from the following observations

Observation, time and pressure

Knowing the element of time and pressure

Observation number

Time in min

Pressure i mmHg

1

0

800

2

100

400

3

200

200

Choices

Choice (4) Response

a.

6.93×10-2

b.

0.693×10-3

c.

0.069× -3

d.

6.93× -3

Question number: 576

» Organic Compounds with Oxygen » Aldehyde and Ketones » Relative Reactivities of Aldehydes and Ketones

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MCQ▾

Question

Formaldehyde can be distinguished from acetaldehyde by the use of?

Choices

Choice (4) Response

a.

Fehling’s solution

b.

Tollen’s reagent

c.

Iodine in presence of a base

d.

Schiff’s reagent

Question number: 577

» Organic Compounds with Oxygen » Aldehyde and Ketones » Nature of Carbonyl Group

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MCQ▾

Question

Aldol condensation is?

Choices

Choice (4) Response

a.

Self-condensation of both aldehydes and ketones having no alpha hydrogen.

b.

Self-condensation of both aldehydes and ketones having at least one alpha hydrogen

c.

Self-condensation of ketones only having at least one alpha hydrogen.

d.

Self-condensation of aldehydes only having at least one alpha hydrogen.

Question number: 578

» Organic Compounds with Oxygen » Aldehyde and Ketones » Relative Reactivities of Aldehydes and Ketones

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MCQ▾

Question

The formation of cyanohydrins from a ketone is an example of?

Choices

Choice (4) Response

a.

Electrophilic substitution

b.

Electrophilic addition

c.

Nucleophilic substitution

d.

Nucleophilic addition