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NEET Practice Test - 12 - NEET MCQ


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30 Questions MCQ Test NEET Mock Test Series 2025 - NEET Practice Test - 12

NEET Practice Test - 12 for NEET 2024 is part of NEET Mock Test Series 2025 preparation. The NEET Practice Test - 12 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 12 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 12 below.
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NEET Practice Test - 12 - Question 1

On distillation with Zn dust, phenol gives :

Detailed Solution for NEET Practice Test - 12 - Question 1

NEET Practice Test - 12 - Question 2

Which of the following reagents will convert p-methyl benzenediazonium chloride into p-cresol?

Detailed Solution for NEET Practice Test - 12 - Question 2

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NEET Practice Test - 12 - Question 3

In a hydrogen atom, if energy of an electron in ground state is – 13.6. eV, then energy in the 2nd excited state is

Detailed Solution for NEET Practice Test - 12 - Question 3

NEET Practice Test - 12 - Question 4

Which of the following will not show mutarotation?

Detailed Solution for NEET Practice Test - 12 - Question 4
Sucrose does not contain a free aldehydic or ketonic group hence it does not show mutarotation.
NEET Practice Test - 12 - Question 5

Which of the following is optically active

Detailed Solution for NEET Practice Test - 12 - Question 5
CH3 - CH- CH2 CH3

contains an asymmetric C - atom.

NEET Practice Test - 12 - Question 6

Which of the following does not have a tetrahedral structure?

Detailed Solution for NEET Practice Test - 12 - Question 6
BH3 has sp2 hybridization and hence does not have tetrahedral structure while all others have tetrahedral structures.
NEET Practice Test - 12 - Question 7

For the equilibrium, kJ/mol. If the ratio of the activation energies of the forward (Ef) and reverse (Eb) reactions is 2/3 then :

Detailed Solution for NEET Practice Test - 12 - Question 7

⇒ –80 + 2x = 3x

⇒ x = –80 kJ/mol for forward

⇒ For backward = –40 + (–80) = –120 kJ/mol

Because activation energy cannot be negative

so, for forward reaction Ea = 80 kJ/mol

for backward reaction Ea = 120 kJ/mol

NEET Practice Test - 12 - Question 8

An antipyretic is

Detailed Solution for NEET Practice Test - 12 - Question 8
Paracetamol is an antipyretic
NEET Practice Test - 12 - Question 9

For an octahedral complex, which of the following d-electron configuration will give maximum CFSE?

Detailed Solution for NEET Practice Test - 12 - Question 9
(a) High spin with d6 configuration

(b) Low spin with d4 configuration

(c) Low spin with d5 configuration

(d) High spin with d7 configuration

NEET Practice Test - 12 - Question 10

Which of the following is known as WORM SILVER?

Detailed Solution for NEET Practice Test - 12 - Question 10
AgCl is called Horn silver or Worm silver.

Ag2S is called Argentite or silver glance.

NEET Practice Test - 12 - Question 11

Calculate the standar d cell potential (in V) of the cell in which following reaction takes place : Fe2+ (aq) + Ag+ (aq) → Fe3+ (aq) + Ag(s)

Given that

Detailed Solution for NEET Practice Test - 12 - Question 11

Ag + (aq) + Fe2+ (aq) → Fe3+ (aq) + Ag(s)

NEET Practice Test - 12 - Question 12

Synthesis of ethanal commercially from which of the following reagent is the part of green chemistry ?

Detailed Solution for NEET Practice Test - 12 - Question 12
Ethanal is commercially prepared by one step oxidation of ethene in the presence of ionic catalyst in aqueous medium with a yield of 90%.

NEET Practice Test - 12 - Question 13

Match the columns

NEET Practice Test - 12 - Question 14

The correct order for acid strength of compounds CHºCH2, CH3–C≡CH and CH2=CH2 is as follows:

Detailed Solution for NEET Practice Test - 12 - Question 14
Order of acidic strength is

CH≡CH > CH3—C≡CH > CH2=CH2

NEET Practice Test - 12 - Question 15

In a gaseous reversible reaction

N2 (g) + O2 (g) ⇌ 2NO(g)+ heat

if pressure is increased, then the equilibrium constant would be :

Detailed Solution for NEET Practice Test - 12 - Question 15
N2 (g) + O2 (g) ⇌ 2NO(g)+ heat

No. of moles of reactants = No. of moles of products.

The reaction in which number of moles of reactants are equal to number of moles of products are not affected by change in pressure (Le-Chatelier's principle).

NEET Practice Test - 12 - Question 16

Select the correct order of evaporation for water, alcohol, petrol and kerosene oil

NEET Practice Test - 12 - Question 17

100 mL O2 and H2 kept at same temperature and pressure. What is true about their number of molecules

Detailed Solution for NEET Practice Test - 12 - Question 17
This is Avogadro’s hypothesis.

According to this, equal volume of all gases contain equal no. of molecules under similar condition of temperature and pressure.

NEET Practice Test - 12 - Question 18

Which one of the following noble gases is not found in the atmosphere?

Detailed Solution for NEET Practice Test - 12 - Question 18
Rn , because it is radioactive element obtained by the disintegration of Radium

NEET Practice Test - 12 - Question 19

Which polymer is used for making magnetic recording tapes?

NEET Practice Test - 12 - Question 20

Which one of the following is fluorspar?

NEET Practice Test - 12 - Question 21

Molecules/ions and their magnetic properties are given below

The correctly matched pairs in the above is:

Detailed Solution for NEET Practice Test - 12 - Question 21

C6H6 is diamagnetic (i – 5)

CrO2 is ferromagnetic (ii – 3)

MnO is antiferromagnetic (iii – 1)

Fe3O4 is ferrimagnetic (iv – 2)

Fe3+ is paramagnetic with 5 unpaired electron (v – 4)

NEET Practice Test - 12 - Question 22

The vapour pressure of water at 20 °C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20 °C, the vapour pressure of the resulting solution will be

Detailed Solution for NEET Practice Test - 12 - Question 22
The vapour pressure of a solution of glucose in water can be calculated using the relation

P = 17.323 mm Hg.

NEET Practice Test - 12 - Question 23

Match the columns

Detailed Solution for NEET Practice Test - 12 - Question 23

NEET Practice Test - 12 - Question 24

Th e factor of D G valu es is impor t an t in metallurgy. The DG values for the following reactions at 800ºC are given as :

S2 (s) + 2O2 (g) → 2SO2 (g) ; ∆G = – 544 kJ

2 Zn (s) + S2 (s) → 2 ZnS(s) ; ∆G = – 293 kJ

2 Zn (s) + O2 (g) → 2ZnO (s) ; ∆G = – 480 kJ

Then ∆G for the reaction :

2 ZnS(s) + 3O2 (g) → 2 ZnO(s)+ 2SO2 (g)

Detailed Solution for NEET Practice Test - 12 - Question 24
For the reaction

2 ZnS → 2 Zn + S2 ; ∆G1º = 293 kJ ...(i)

2 Zn + O2 → 2 ZnO ; ∆G2º = –480 kJ ...(ii)

S2 + 2 O2 → 2 SO2 ; ∆G3º = –544 kJ ...(iii)

∆Gº for the reaction

2 ZnS + 3 O2 → 2 ZnO + 2 SO2

can be obtained by adding eqs. (i), (ii) and (iii)

⇒ ∆Gº = 293 – 480 – 544 = – 731 kJ

NEET Practice Test - 12 - Question 25

In the series of reaction

X and Y are respectively

Detailed Solution for NEET Practice Test - 12 - Question 25

NEET Practice Test - 12 - Question 26

The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius 211.6 pm. This transition is associated with :

Detailed Solution for NEET Practice Test - 12 - Question 26

n = 2 (Balmer series)

NEET Practice Test - 12 - Question 27

Which one of the following pairs represents stereoisomerism?

Detailed Solution for NEET Practice Test - 12 - Question 27
Optical and geometrical isomerism pair up to exhibit stereoisomerism. This is because the isomers differ only in their orientation in space.
NEET Practice Test - 12 - Question 28

H2O is polar, whereas BeF2 is not. It is because

Detailed Solution for NEET Practice Test - 12 - Question 28
Dipole moment cancels each other in BeF2 because of linear shape and thus it is non-polar, whereas H2O is V-shape and is polar.
NEET Practice Test - 12 - Question 29

The rate constant for a chemical reaction has units L mol–1s–1, order of the reaction will be

Detailed Solution for NEET Practice Test - 12 - Question 29
Unit of rate constant

1 = n – 1

n = 2,

This is the unit for IInd order reaction.

NEET Practice Test - 12 - Question 30

Match the columns.

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