NEET : Chemistry – 2021 – Exam Mode

Chemistry – NEET-2021 – Exam Mode

This quiz is in the format of Exam, has 50 questions ( Attempt 45) . Results are displayed at end.

Total time duration : 45 Minutes
Points to remember
- Right answer : +4
- Wrong Answer : -1
- Number of attempts : Unlimited

1 / 50

Dihedral angle of least stable conformer of ethane is :

120°

60°

180°

0°

2 / 50

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

Noble gases are sparingly soluble in water

Noble gases have very high melting and boiling points

Noble gases have weak dispersion forces

Noble gases have large positive values of electron gain enthalpyp

3 / 50

The major product of the following chemical reaction is :

1

2

3

4

4 / 50

A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz).
The wavelength of the electromagnetic radiation emitted by the transmitter is :

[speed of light c = 3.0 × 10⁸ ms^-1]

219.3 m

219.2 m

2192 m

21.92 cm

5 / 50

The incorrect statement among the following is :

Actinoid contraction is greater for element to element lanthanoid contractions

Most of the trivalent Lanthanoid ions are colorless in the solid state

Lanthanoids are good conductors of heat and electricity

Actinoids are highly reactive metals, especially when finely divided

6 / 50

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :

8, 4

6, 12

2, 1

12, 6

7 / 50

Identify the compound that will react with Hinsberg’s reagent to give a solid which dissolves in alkali

1

2

3

4

8 / 50

Which of the following reactions is the metal displacement reaction?

Choose the right option.

1

2

3

4

9 / 50

Given below are two statements :

Statement I :

Aspirin and Paracetamol belong to the class of narcotic analgesics.

Statement II :

Morphine and Heroin are non-narcotic analgesics. In the light of the above statements, choose the correct answer from the options given below.

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is correct but Statement II is false

Statement I is incorrect but Statement II is true

10 / 50

What is the IUPAC name of the organic compound formed in the following chemical reaction?

2-methylpropan-2-ol

pentan-2-ol

pentan-3-ol

2-methylbutan-2-ol

11 / 50

Statement I :

Acid strength increases in the ordergiven as HF << HCl << HBr << HI. Statement II :

As the size of the elements F, Cl, Br,I increases down the group, the bond strength of HF,HCl, HBr and HI decreases and so the acid strength increases.I n the light of the above statements, choose the correct answer from the options given below.

Both statement I and Statement II are true

Statement I is correct but statement II is false

Both Statement I and Statement II are false

Statement I is incorrect but Statement II is true

12 / 50

Which one among the following is the correct option for right relationship between C_P and C_Vfor one mole of ideal gas?

(1) C_P+C_V=R
(2) C_P−C_V=R
(3) C_P=RC_V
(4) C_V=RC_P

1

2

3

4

13 / 50

Match List-I with List-II.

	List-I		List-II
a	PCl₅	i	Square pyramidal
b	SF₆	ii	Trigonal planar
c	BrF₅	iii	Octahedral
d	BF₃	iv	Trigonal bipyramidal

Choose the correct answer from the options given below.

(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

(a)-(iii), (b)-(i), (c)-(iv)(d)-(ii)

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

14 / 50

The following solutions were prepared by dissolving 10 g of glucose (C₆H₁₂O₆) in 250 ml of water (P₁),10 g of urea (CH₄N₂₀) in 250 ml of water (P₂) and 10 g of sucrose (C₁₂H₂₂O₁₁) in 250 ml of water (P₃).
The right option for the decreasing order of osmotic pressure of these solutions is :

P₂ > P₁ > P₃

P₁ > P₂ > P₃

P₂ > P₃ > P₁

P₃ > P₁> P₂

15 / 50

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

Electrolysis

Chromatography

Distillation

Zone Refining

16 / 50

Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

Beta (β^–)

Alpha (α)

Gamma (γ)

Neutron (n)

17 / 50

The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :

7

5

2

3

18 / 50

The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on?

Saytzeff’s Rule

Hund’s Rule

Hofmann Rule

Huckel’s Rule

19 / 50

The maximum temperature that can be achieved in blast furnace is :

Upto 1200 K

Upto 2200 K

Upto 1900 K

Upto 5000 K

20 / 50

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol–1 respectively. The molar conductance of CH₃COOH at infinite dilution is.
Choose the right option for your answer

201.28 S cm² mol^-1

390.71 S cm² mol^-1

698.28 S cm² mol^-1

540.48 S cm² mol^-1

21 / 50

Ethylene diaminetetraacetate (EDTA) ion is :

Hexadentate ligand with four “O” and two “N” donor atoms

Unidentate ligand

Tridentate ligand with three “N” donor atoms

Bidentate ligand with two “N” donor atoms

22 / 50

The structures of beryllium chloride in solid state and vapour phase, are :

Chain and dimer, respectively

Linear in both

Dimer and Linear, respectively

Chain in both

23 / 50

The correct structure of 2, 6-Dimethyl-dec-4-ene is

1

2

3

4

24 / 50

The right option for the statement “Tyndall effect is exhibited by”, is :

NaCl solution

Glucose solution

Starch solution

Urea solution

25 / 50

Which one of the following polymers is prepared by addition polymerisation?

Teflon

Nylon-66

Novolac

Dacron

26 / 50

The RBC deficiency is deficiency disease of :

Vitamin B₁₂

Vitamin B₆

Vitamin B₁

Vitamin B₃

27 / 50

The correct sequence of bond enthalpy of ‘C—X’ bond is :

1

2

3

4

28 / 50

An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound
is : [Atomic wt. of C is 12, H is

CH

CH₂

CH₃

CH₄

29 / 50

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :

Calcium chloride

Strontium chloride

Magnesium chloride

Beryllium chloride

30 / 50

BF₃ is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

sp³ and 4

sp² and 4

sp² and 6

sp³ and 8

31 / 50

The pK_b of dimethylamine and pKa_a of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate
solution is :

8.20

6.75

7.75

5.75

32 / 50

Choose the correct option for graphical representation of Boyle’s law, which shows a graph of pressure vs volume of a gas at different temperatures :

1

2

3

4

33 / 50

For a reaction A -> B, enthalpy of reaction is –4.2 kJ mol–1 and enthalpy of activation is9.6 kJ mol^-1. The correct potential energy profile for
the reaction is shown in option

1

2

3

4

34 / 50

The compound which shows metamerism is :

C₅H₁₂

C₃H₈O

C₃H₆O

C₄H₁₀O

35 / 50

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

Belonging to same group

Diagonal relationship

Lanthanoid contraction

Having similar chemical properties

36 / 50

Match List-I with List-II.

	List-I		List-II
a	[Fe(CN)₆]^3-	i	5.92 BM
b	[Fe(H₂O)₆]³⁺	ii	0 BM
c	[Fe(CN)₆]^4-	iii	4.90 BM
d	[Fe(H₂O)₆]²⁺	iv	1.73 BM

Choose the correct answer from the options given below.

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

37 / 50

The reagent ‘R’ in the given sequence of chemical reaction is:

H₂O

CH₃CH₂OH

HI

CuCN/KCN

38 / 50

From the following pairs of ions which one is not an iso-electronic pair?

O^2-, F^––

Na⁺, Mg²⁺

Mn²⁺, Fe³⁺

Fe²⁺, Mn²⁺

39 / 50

The slope of Arrhenius plot ( ln k v/s 1/T) of first order reaction is –5 × 10³K. The value of E_a of the reaction is.

Choose the correct option for your answer.

[Given R = 8.314 JK^-1mol^-1]

41.5 kJ mol^-1

83.0 kJ mol^-1

166 kJ mol^-1

–83 kJ mol^-1

40 / 50

For irreversible expansion of an ideal gas under isothermal condition, the correct option is:

ΔU = 0, ΔS_total= 0

ΔU ≠ 0, ΔS_total ≠ 0

ΔU = 0, ΔS_total ≠ 0

ΔU ≠ 0, ΔS_total= 0

41 / 50

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

HF < HCl < HBr < HI : Increasing acidic strength

H₂O < H₂S < H₂Se < H₂Te : Increasing pK_a values

NH₃ < PH₃ < AsH₃ < SbH₃ : Increasing acidic character

CO₂ < SiO₂ < SnO₂ < PbO₂ : Increasing oxidizing power

42 / 50

The intermediate compound ‘X’ in the following chemical reaction

1

2

3

4

43 / 50

The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in molar ratio 3 : 2 is :

[At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

160 mm of Hg

168 mm of Hg

336 mm of Hg

350 mm of Hg

44 / 50

The molar conductivity of 0.007 M acetic acid is 20 S cm² mo^-1. What is the dissociation constant of acetic acid?

Choose the correct option.

1.75×10^-4 mol L^-1

2.5×10^-4 mol L^-1

1.75×10^-5 mol L^-1

2.50×10^-5 mol L^-1

45 / 50

Consider the below reaction and identify the missing reagent/chemical.

B₂H₆

Red Phosphorus

CaO

DIBAL-H

46 / 50

Choose the correct answer from the options given above

(a) – (iv), (b) – (i), (c) – (ii), (d) – (iii)

(a) – (iii), (b) – (ii), (c) – (i), (d) – (iv)

(a) – (i), (b) – (iv), (c) – (iii), (d) – (ii)

(a) – (ii), (b) – (iii), (c) – (iv), (d) – (i)

47 / 50

The product formed in the following chemical reaction is:

1

2

3

4

48 / 50

Which of the following molecules is non-polar in nature?

POCl₂

CH₂O

SbCl₅

NO₂

49 / 50

Match List-I with List-II.

Choose the correct answer from the options given below.

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

(a)-(ii), (b)-(iii), (c)-(iv),(d)-(i)

(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

50 / 50

Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O₂ and 2 g H₂ confined in a total volume of one litre at 0°C is :

[Given R = 0.082 L atm mol^-1K^-1, T = 273 K]

2.518

2.602

25.18

26.02

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