NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 884 - 888 of 1259

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Question number: 884

» Solutions » Methods for Concentration of Solution

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Appeared in Year: 2016

MCQ▾

Question

AIF3 is soluble in HF only in presence of KF. It is due to the formation of

Choices

Choice (4)Response

a.

K [AlF3H]

b.

AlH3

c.

K3 [AlF3H3]

d.

K3 [AlF6]

Question number: 885

» Hydrocarbons » Preparation, Properties and Reactions

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MCQ▾

Question

Which of the following compounds cannot be prepared by Wurtz reaction?

(1)

Which Compound cannot be prepared by Wurtz reaction

Which Compound Cannot be Prepared by Wurtz Reaction

(2) CH3CH3

(3) (CH3) 2CHCH3

(4) CH3CH2CH2CH3

Which is the correct choice?

Choices

Choice (4)Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1,2 and 3 are correct

Question number: 886

» Biomolecules » Nucleic Acids

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MCQ▾

Question

Which of the following statement is not true?

Choices

Choice (4)Response

a.

Glucose does not give test

b.

has intermolecular

c.

Glucose, manose and fructose from identical Oxone

d.

Two stands in DNA are not identical

Passage

Read the passage given below and answer the questions that follows:

Acetylene and other terminal alkynes (1-alkynes) are weakly acidic in character. The acetylenic hydrogen of such alkynes can be replaced by copper (1) and silver (I) ions. They react with ammonical solutions of cuprous chloride and silver nitrate to form the corresponding copper and silver alkynides.

This reaction can be used to distinguish between 2-alkynes and 1-alkynes. 1-Alkynes will give this test while 2-alkynes, will not give this test.

Question number: 887 (1 of 3 Based on Passage) Show Passage

» Hydrocarbons » Alkynes » Addition of Hydrogen, Halogens, Water and Hydrogen Halides

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MCQ▾

Question

Acetylene gives -

Choices

Choice (4)Response

a.

Red ppt

b.

White ppt with Cu2Cl2 and red ppt with AgNO3

c.

White ppt

d.

White ppt with AgNO3 and red ppt with Cu2Cl2

Question number: 888 (2 of 3 Based on Passage) Show Passage

» Hydrocarbons » Alkynes » Acidic Character

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MCQ▾

Question

Acetylenic hydrocarbons are acidic because-

Choices

Choice (4)Response

a.

Acetylene has only one hydrogen atom at each carbon atom

b.

Acetylene belongs to the class of alkynes with formula CnH2n-2

c.

Acetylene contains least number of hydrogen atoms among the possible

d.

Sigma electron density of C — H bond in acetylene is nearer a carbon, which has 50 % s-character

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