NEET : Chemistry – 2019 – Exam Mode

Chemistry – NEET-2019 – Exam Mode

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

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

1 / 45

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar.

The work done by the gas is

(Given that 1 L bar = 100 J)

–30 J

5 kJ

25 J

30 J

2 / 45

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids.

The formula of the compound is :

C₂ A₃

C₃ A₂

C₃ A₄

C₄ A₃

3 / 45

pH of a saturated solution of Ca(OH)₂ is 9.

The solubility product (K_sp) of Ca(OH)₂ is:

0.5 × 10^-15

0.25 × 10^-10

0.125 × 10^-15

0.5 × 10^-10

4 / 45

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is :

10

20

30

40

5 / 45

For an ideal solution, the correct option is

Δ_mixS = 0 at constant T and P

Δ_mixV ≠ 0 at constant T and P

Δ_mixH = 0 at constant T and P

Δ_mixG = 0 at constant T and P

6 / 45

For a cell involving one electron E°cell= 0.59 Vat 298 K, the equilibrium constant for the cell reaction is :

[Given that 2.303 RT /F = 0.059V at T = 298 K]

1.0 × 10²

1.0 × 10⁵

1.0 × 10¹⁰

1.0 × 10³⁰

7 / 45

Among the following, the one that is not a green house gas is

Nitrous oxide

Methane

Ozone

Sulphur dioxide

8 / 45

The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is

10σ bonds and 3π bonds

8σ bonds and 5π bonds"

11σ bonds and 2π bonds

13σ bonds and no π bonds

9 / 45

Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?

O2

N2

C2

Be2

10 / 45

Which of the following reactions are disproportionation reaction?

(a) and (b) only

(a), (b) and (c)

(a), (c) and (d)

(a) and (d) only

11 / 45

Among the following, the narrow spectrum antibiotic is :

Penicillin G

Ampicillin

Amoxycillin

Chloramphenicol

12 / 45

The correct order of the basic strength of methyl substituted amines in aqueous solution is :

(CH₃)2NH > CH₃NH₂ > (CH₃)3N

(CH₃)3N > CH₃NH₂ > (CH₃)2NH

(CH₃)3N > (CH₃)2NH > CH₃NH₂

CH₃NH₂ > (CH₃)2NH > (CH₃)3N

13 / 45

Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l– sol ?

50 mL of 1 M AgNO₃ + 50 mL of 1.5 M KI

50 mL of 1 M AgNO₃ + 50 mL of 2 M KI

50 mL of 2 M AgNO₃ + 50 mL of 1.5 M KI

50 mL of 0.1 M AgNO₃ + 50 mL of 0.1 M KI

14 / 45

Conjugate base for Bronsted acids H₂O and HF are :

OH^– and H₂F⁺, respectively

H₃O⁺ and F^–, respectively

OH^– and F^–, respectively

H₃O⁺ and H₂F⁺, respectively

15 / 45

Which will make basic buffer?

50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH₃COOH

100 mL of 0.1 M CH₃COOH + 100 mL of 0.1 M NaOH

100 mL of 0.1 M HCl + 200 mL of 0.1 M NH₄4OH

100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH

16 / 45

The compound that is most difficult to protonate is

1

2

3

4

17 / 45

The most suitable reagent for the following conversion, is

Na/liquid NH₃

H₂, Pd/C, quinoline

Zn/HCl

Hg²⁺/H⁺, H₂O

18 / 45

Which of the following species is not stable?

[SiF₆ ]^2-

[GeCl₆ ]^2-

[Sn(OH)₆ ]^2-

[SiCl₆ ]^2-

19 / 45

Which of the following is an amphoteric hydroxide?

Sr(OH)₂

Ca(OH)₂

Mg(OH)₂

Be(OH)₂

20 / 45

The structure of intermediate A in the following reaction, is

Options

1

2

3

4

21 / 45

The manganate and permanganate ions are tetrahedral, due to :

The π-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

There is no π-bonding

The π-bonding involves overlap of p-orbitals of oxygen with p-orbitals of manganese

The π-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese

22 / 45

For the second period elements the correct increasing order of first ionisation enthalpy is

Li < Be < B < C < N < O < F < Ne

Li < B < Be < C < O < N < F < Ne

Li < B < Be < C < N < O < F < Ne

Li < Be < B < C < O < N < F < Ne

23 / 45

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by

t = 0.693/k

t = 6.909/k

t = 4.606/k

t = 2.303/k

24 / 45

Identify the incorrect statement related to PCl₅ from the following:

Three equatorial P–Cl bonds make an angle of 120° with each other

Two axial P–Cl bonds make an angle of 180° with each other

Axial P–Cl bonds are longer than equatorial P–Cl bonds

PCl₅ molecule is non-reactive

25 / 45

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

5f > 6p > 5p > 4d

6p > 5f > 5p > 4d

6p > 5f > 4d > 5p

5f > 6p > 4d > 5p

26 / 45

The biodegradable polymer is:

Nylon-6,6

Nylon-2-Nylon 6

Nylon-6

Buna-S

27 / 45

Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code:

	Column – I		Column – II
a	XeF₄	i	Pyramidal
b	XeF₆	ii	Square planar
c	XeOF₄	iii	Distorted octahedral
d	XeO₃	iv	Square pyramidal

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

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

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

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

28 / 45

Which is the correct thermal stability order for H₂E (E = O, S, Se, Te and Po)?

H₂S < H₂O < H₂Se < H₂Te < H₂Po

H₂O < H₂S < H₂Se < H₂Te < H₂Po

H₂Po < H₂Te < H₂Se < H₂S < H₂O

H₂Se < H₂Te < H₂Po < H₂O < H₂S

29 / 45

The correct structure of tribromooctaoxide is

1

2

3

4

30 / 45

An alkene “A” on reaction with O3 and Zn–H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is:

1

2

3

4

31 / 45

Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is

Be

Mg

Ca

Sr

32 / 45

Which one is malachite from the following?

CuFeS₂

Cu(OH)₂

Fe₃O₄

CuCO₃.Cu(OH)₂

33 / 45

Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?

Lyman series

Balmer series

Paschen series

Brackett series

34 / 45

The mixture that forms maximum boiling azeotrope is:

Water + Nitric acid

Ethanol + Water

Acetone + Carbon disulphide

Heptane + Octane

35 / 45

For the cell reaction

[Given that Faraday constant F = 96500 C mol^-1]

– 46.32 kJ mol^-1

– 23.16 kJ mol^-1

46.32 kJ mol^-1

23.16 kJ mol^-1

36 / 45

In which case change in entropy is negative?

Evaporation of water

Expansion of a gas at constant temperature

Sublimation of solid to gas

2H(g) -> H₂(g)

37 / 45

Match the following :

	Column – I		Column – II
a	Pure nitrogen	i	Chlorine
b	Haber process	ii	Sulphuric acid
c	Contact process	iii	Ammonia
d	Deacon’s process	iv	Sodium azide or Barium azide

Which of the following is the correct option?

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

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

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

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

38 / 45

Which of the following is incorrect statement?

PbF₄ is covalent in nature

SiCl₄ is easily hydrolysed

GeX₄ (X = F, Cl, Br, I) is more stable than GeX₂

SnF₄ is ionic in nature

39 / 45

The non-essential amino acid among the following is:

Valine

Leucine

Alanine

Lysine

40 / 45

A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is :

Z > 1 and attractive forces are dominant

Z > 1 and repulsive forces are dominant

Z < 1 and attractive forces are dominant

Z < 1 and repulsive forces are dominant

41 / 45

Among the following, the reaction that proceeds through an electrophilic substitution, is:

1

2

3

4

42 / 45

The major product of the following reaction is

1

2

3

4

43 / 45

For the chemical reaction

1

2

3

4

44 / 45

What is the correct electronic configuration of the central atom in K₄[Fe(CN)₆] based on crystal field theory?

1

2

3

4

45 / 45

The method used to remove temporary hardness of water is :

Calgon’s method

Clark’s method

Ion-exchange method

Synthetic resins method

Your score is