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Chemistry NEET Questions — Free MCQ Practice

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Which of the following is correct?

A.

Physical change refers to change in shape without breaking the bonds

B.

Change in state of matter also takes place in physical change

C.

Chemical change involves breaking of old bonds and formation of new ones.

D.

All of these

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Explanation

Refer NCERT, Heading 9.12.1, page-154

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Which of the following is true?

A.

Rate of physical or chemical process refers to the amount of product formed per unit time.

B.

Rate can also be called as velocity of the reaction

C.

Rate of reaction is influenced by temperature.

D.

All of these

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Explanation

Refer NCERT, Heading 9.12.1, page-154,155

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Lactose is composed of

A.

glucose + fructose

B.

glucose + glucose

C.

glucose + galactose

D.

fructose + galactose

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Explanation

(c) Lactose (C₁₂H₂₂O₁₁) is a disaccharide found in mammalian milk. It comprises galactose and glucose units which are linked together by b, 1-4 glycosidic bonds. It is a reducing sugar.

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Which one of the following amino acids is an essential part of human diet ?

A.

Glycine

B.

Phenylalanine

C.

Serine

D.

Aspartic acid

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Explanation

(b) For human beings, eight amino acids are essential. these are leucine, isoleucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.

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The haemorrhagic disease of new born is caused due to the deficiency of

A.

vitamin-A

B.

vitamin-B₁

C.

vitamin-B₁₂

D.

vitamin-K

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Explanation

(d) The haemorrhagic disease of new born is caused due to the deficiency of vitamin-K, characterised by delayed blood clotting and haemorrhage (blood loss).

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Calcium deficiency occurs in the absence of vitamin

A.

D

B.

C

C.

E

D.

B

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Explanation

(a) Vitamin-D (calciferol/antirachitic factor) mainly helps in Ca/P balance in the body fluids. It increases absorption of calcium from intestine so, it is necessary for formation of healthy bones and teeth Deficiency of vitamin-D causes increased loss of Ca⁺ in urine, so, no Ca^- gets deposited in the bones. This cause rickets in children and in pregnant woman it causes osteomalacia.

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The vitamin-C or ascorbic acid prevents

A.

rickets

B.

pellagra

C.

scurvy

D.

antibody synthesis

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Explanation

(c) Vitamin-C or ascorbic acid prevents scurvy (failure to form connective tissue). Characterised by bleeding gums, anaemia, loose teeth, painful and swollen joints, delayed healing of wounds and emaciation.

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Which group of three of the following five statements (A-E) contains all three correct statements regarding beri-beri ?

A-A crippling disease prevalent among the native population of sub-Sahara Africa

B- .A deficiency disease caused by lack of thiamine (vitamin-B,)

C .A nutritional disorder in infants and young children when the diet is persistently deficient in essential protein

D.Occurs in those countries where the staple diet is polished rice

E. The symptoms are pain from neuritis, paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure

A.

A, C and E

B.

B, C and E

C.

A, B and D

D.

B, D and E

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Explanation

(d) The deficiency of vitamin-B, or thiamine is the disease beri-beri. This disease occurs in those
countries where the staple diet is polished rice. The symptoms of this disease are pain from neuritis,
paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure.

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Which of the following is required in small quantities?

A. Vitamins B. Glucose C. amino acids D. Fatty acids

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Explanation

NCERT page number 257.

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Which of the following methods is not typically used for the industrial preparation of phenol?

A. From cumene B. From benzenesulphonic acid C. From haloarenes (Dow process) D. From Grignard reagents

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Explanation

The NCERT text specifies that phenol is commercially produced synthetically, and lists methods like from haloarenes, benzenesulphonic acid, diazonium salts, and cumene. Production from Grignard reagents is used for alcohols, not typically for industrial phenol synthesis.

Chemistry MCQs for NEET — Practice Questions with Answers

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