NEET Chemistry Chapter Wise Mock Test – Some Basic Principles and Techniques

NEET Chemistry Chapter Wise Mock Test – Some Basic Principles and Techniques

Question 1:

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Question 7:
Which of the following will have a meso – isomer also?
(a) 2-chlorobutane
(b) 2, 3-dichlorobutane
(c) 2, 3-dichloropentane
(d) 2-hydroxy propanoic acid

Question 8:
Number of optical isomers of lactic acid are
(a) 1
(b) 2
(c) 3
(d) 4

Question 9:
How many enantiomeric pairs are obtained by monochlorination of 2, 3-dimethyl butane?
(a) Four
(b) Two
(c) Three
(d) One

Question 10:
If there is no rotation of plane polarised light by a compound in a specific solvent, thought to be chiral, it may mean that
(a) the compound is certainly achiral
(b) the compound is certainly meso
(c) there is no compound rrt the solvent
(d) the compound maylSdirafcemic mixture

Question 11:
Among the following which one can have a meso form?
(a) CH₃CH(OH)CH(CI)C₂H5
(b) CH₃CH(OH)CH(OH)CH₃
(c) C₂H₅CH(OH)CH(OH)CH₃
(d) HOCH₂CH(CI)CH₃

Question 12:

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Question 14:
More stable carbocation is formed during heating of which one of the following compound with conc.H2SO4
(a) (CH₃)₃COH
(b) C₆H₅CH₂OH
(c) (CH₃)2CHOH
(d) CH₃CH(OH)CH₂CH₃

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Question 25:
Hyperconjugation involves delocalisation
(a) electrons of carbon-hydrogen bond of an alkyl group directly linked to an atom of unsaturated system
(b) electrons of carbon-hydrogen bond of alkyl group directly attached to the negatively charged carbon atom
(c)π-electrons of carbon-carbon bond
(d) one pair of electrons

Question 26:

Question 27:

Question 28:
Dehydrohalogenation of an alkyl halide is
(a) nucleophilic substitution reaction
(b) elimination reaction
(c) rearrangement reaction
(d) Both (a) and (b)

Question 29:
Impure naphthalene is purified by
(a) fractional crystallisation
(b) Konal distillation
(c) solvent extraction
(d) sublimation

Question 30:
The best method for the separation of naphthalene and benzoic acid from their mixture is
(a) chromatography
(b) crystallisation
(c) distillation
(d) sublimation

Question 31:
Fractional distillation is useful in the distillation of
(a) petroleum
(b) coaltar
(c) crude alcohol
(d) All of these

Question 32:
Impure glycerine can be purified by
(a) steam distillation
(b) simple distillation
(c) vacuum distillation
(d) extraction with a solvent

Question 33:
Steam distillation is based on the fact that vaporisation of organic liquid takes place at
(a) lower temperature than its boiling point
(b) higher temperature than its boiling point
(c) its boiling point
(d) water and organic liquid both undergo distillation

Question 34:
The sodium extract of an organic compound on acidification with acetic acid and addition of lead acetate solution gives a black precipitate. The organic compound contains
(a) nitrogen
(b) halogen
(c) sulphur
(d) phosphorus

Question 35:
Copper wire test of halogens is known as
(a) Leibig’stest
(b) Lassaigne’s test
(c) Fusion test
(d) Beilstein’s test

Question 36:
During AgN0₃ test for detection of halogens, sodium extract is boiled with few drops of cone. HN0₃ to decompose
(a) NaCN
(b) Na₂S
(c) Both (a) and (b)
(d) None of these

Question 37:

Question 38:
Sodium nitroprusside when added to an alkaline solution of sulphide ions, produce a
(a) red colouration
(b) blue colouration
(c) purple colouration
(d) brown colouration

Question 39:
0.5 g of hydrocarbon gave 0.9 g water on combustion. The percentage of carbon in hydrocarbon is
(a) 60.6
(b) 28.8
(c) 80.0
(d) 68.6

Question 40:
Percentage composition of an organic compound is as follows C = 10.06, H = 0.84, Cl = 89.10
Which of the following corresponds to its molecular formula if the vapour density is 60.0?
(a) CH₃CI
(b) CHCI₃
(c) CH₂CI₂
(d) None of these

Question 41:
Empirical formula of a compound is CH20 and its vapour density is 30. Molecular formula of the compound is
(a) C₂H40₂
(b) C₂H60₂
(C) C₂H20₂
(d) C₂H₄0

Question 42:
An organic compound contains about 52% carbon. It could be
(a) Only ethanol
(b) Only dimethyl ether
(c) Both (a) and (b)
(d) None of these

Direction (Q. Nos. 43-44) In the following questions more than one answers given may be correct. Select the correct answers and mark it according to the codes.
Codes
(a) 1,2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 43:
For resonance structure, a molecule should have
1. identical arrangement of atoms
2. nearly same energy content
3. the same number of paired electrons
4. identical bonding

Question 44:
Which of the following molecules contains(s) only primary hydrogen atoms?
(a) Neo-pentane
(b) Neo-hexane
(c) 2,2,3,3-tetramethylbutane
(d) 2,2,3-trimethylpentane

Question 45:

Question 46:

Direction (Q. NOS. 47-49) Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is the correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not the correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Question 47:
Assertion In the test of.nitrogen, FeS0₄ is used.
Reason FeS0₄ cannot be easily oxidised.

Question 48:
Assertion A mixture of plant pigments can be separated by chromatography.
Reason Chromatography is used for the separation of coloured substances into individual components.

Question 49:
Assertion In the E2 elimination, p-H and leaving group should be antiperiplanar.
Reason In the E2 elimination, base always abstracts unhindered p-H.

Question 50:
In Duma’s method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is
(a) 17.36
(b) 18.20
(c) 16.76
(d) 15.76

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Question 55:
In the Kjeldahl’s for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10 mL of 1 M H₂SO₄ The percentage of nitrogen in the soil is
(a) 37.33
(b) 45.33
(c) 35.53
(d) 43,33

Question 56:
The number of isomer for the compound with the molecular formula C₂BrCIFl is
(a) 3
(b) 4
(c) 5
(d) 6

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Question 60:
Which of the following acids does not exhibit optical isomerism?
(a) Maleic acid
(b) a-amino acids
(c) Lactic acid
(d) Tartaric acid

Question 61:

Question 62:
Which one of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?
(a) Benzyl chloride
(b) Ethyl chloride
(c) Chlorobenzene
(d) sopropyl chloride

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Question 65:

Question 66:
In Duma’s method of estimation of nitrogen, 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be
(Aqueous tension at 300 K = 15 mm)
(a) 16.45
(b) 17.45
(c) 14.45
(d) 15.45

Question 67:

Question 68:
Which one is the most reactive towards SN1 reaction?
(a) C₆H₅CH(C₆H₅)Br
(b) C₆H₅CH(CH₃)Br
(c) C₆H₆C(CH₃)(C₆H₅)Br
(d) C₆H₅CH₂Br

Question 69:

Question 70:
In an organic compound, phosphorus is estimated as
(a) Mg₂P₂0₇
(b) Mg₃(P0₄)₂
(c) H₃P0₄
(d) P₂0₅

Question 71:

Question 72:

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