NEET Practice Test - 12 - NEET MCQ

# NEET Practice Test - 12 - NEET MCQ

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## 180 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

### Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and resistance 8 W each. They are connected in parallel with a cell of emf 4 V and negligible internal resistance. The deflections produced in the tangent galvanometers A and B are 30° and 60° respectively. If A has 2 truns, then B must have

Detailed Solution for NEET Practice Test - 12 - Question 1
For a tangent galvanometer,

Now 8 Ω and 8 Ω in parallel = 4 Ω.

N = number of turns

NEET Practice Test - 12 - Question 2

### On distillation with Zn dust, phenol gives :

Detailed Solution for NEET Practice Test - 12 - Question 2

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NEET Practice Test - 12 - Question 3

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

Detailed Solution for NEET Practice Test - 12 - Question 3

NEET Practice Test - 12 - Question 4

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 4

NEET Practice Test - 12 - Question 5

Which of the following will not show mutarotation?

Detailed Solution for NEET Practice Test - 12 - Question 5
Sucrose does not contain a free aldehydic or ketonic group hence it does not show mutarotation.
NEET Practice Test - 12 - Question 6

Which of the following is optically active

Detailed Solution for NEET Practice Test - 12 - Question 6
CH3 - CH- CH2 CH3

contains an asymmetric C - atom.

NEET Practice Test - 12 - Question 7

Which of the following does not have a tetrahedral structure?

Detailed Solution for NEET Practice Test - 12 - Question 7
BH3 has sp2 hybridization and hence does not have tetrahedral structure while all others have tetrahedral structures.
NEET Practice Test - 12 - Question 8

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 8

⇒ –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 9

An antipyretic is

Detailed Solution for NEET Practice Test - 12 - Question 9
Paracetamol is an antipyretic
NEET Practice Test - 12 - Question 10

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

Detailed Solution for NEET Practice Test - 12 - Question 10
(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 11

Which of the following is known as WORM SILVER?

Detailed Solution for NEET Practice Test - 12 - Question 11
AgCl is called Horn silver or Worm silver.

Ag2S is called Argentite or silver glance.

NEET Practice Test - 12 - Question 12

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 12

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

NEET Practice Test - 12 - Question 13

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

Detailed Solution for NEET Practice Test - 12 - Question 13
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 14

Match the columns

NEET Practice Test - 12 - Question 15

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 15
Order of acidic strength is

CH≡CH > CH3—C≡CH > CH2=CH2

NEET Practice Test - 12 - Question 16

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 16
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 17

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

NEET Practice Test - 12 - Question 18

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 18

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 19

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

Detailed Solution for NEET Practice Test - 12 - Question 19
Rn , because it is radioactive element obtained by the disintegration of Radium

NEET Practice Test - 12 - Question 20

Which polymer is used for making magnetic recording tapes?

NEET Practice Test - 12 - Question 21

Which one of the following is fluorspar?

NEET Practice Test - 12 - Question 22

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 22

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 23

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 23
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 24

Match the columns

Detailed Solution for NEET Practice Test - 12 - Question 24

NEET Practice Test - 12 - Question 25

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 25
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 26

In the series of reaction

X and Y are respectively

Detailed Solution for NEET Practice Test - 12 - Question 26

NEET Practice Test - 12 - Question 27

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 27

n = 2 (Balmer series)

NEET Practice Test - 12 - Question 28

Which one of the following pairs represents stereoisomerism?

Detailed Solution for NEET Practice Test - 12 - Question 28
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 29

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

Detailed Solution for NEET Practice Test - 12 - Question 29
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 30

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 30
Unit of rate constant

1 = n – 1

n = 2,

This is the unit for IInd order reaction.

NEET Practice Test - 12 - Question 31

Match the columns.

NEET Practice Test - 12 - Question 32

In passing 3 F of electricity through three electrolytic cells connected in series containing Ag+, Ca2+,and Al3+ ions, respectively. The molar ratio in which the three metal ions are liberated at the electrodes is

Detailed Solution for NEET Practice Test - 12 - Question 32
Ag+ + e → Ag

1 F is required for 1 mole. So 3 F will produce 3 mole

Ca2+ + 2e → Ca

2F is required for 1 mole. So 3 F will produce

Al+3 + 3e → Al

3F is required for 1 mole. So 3F will produce 1 mole.

Molar ratio 3 :

NEET Practice Test - 12 - Question 33

In the reaction

CH3C ≡ C - Na+ + (CH3)2 CH - Cl → ?

the product formed is :

Detailed Solution for NEET Practice Test - 12 - Question 33

NEET Practice Test - 12 - Question 34

If temperature increases, the surface tension of a liquid

NEET Practice Test - 12 - Question 35

Total number of lone pair of electrons in XeOF4 is

Detailed Solution for NEET Practice Test - 12 - Question 35
In XeOF4, xenon is sp3d2 hybridised and has one lone pair of electrons.

NEET Practice Test - 12 - Question 36

Of the following hydrides which one has the lowest boiling point ?

Detailed Solution for NEET Practice Test - 12 - Question 36
NH3 undergoes H-bonding and hence has the highest b.p. Among the remaining hydrides i.e. PH3, AsH3 and SbH3 as we move from PH3 to BiH3, the molecular mass increases. As a result the van der Waal’s forces of attraction increases and the boiling point increases regularly from PH3 to BiH3.
NEET Practice Test - 12 - Question 37

The best method to prepare cyclohexene from cyclohexanol is by using

Detailed Solution for NEET Practice Test - 12 - Question 37

Conc. HCl, HBr and conc. HCl + ZnCl2 all are nucleophiles, thus convert alcohols to alkyl halides. However, conc. H3PO4 is a good dehydrating agent which converts an alcohol to an alkene.

NEET Practice Test - 12 - Question 38

Detailed Solution for NEET Practice Test - 12 - Question 38

1° Amine is in reaction with HONO converted into alcohol.

NEET Practice Test - 12 - Question 39

Keto-enol tautomerism is observed in :

Detailed Solution for NEET Practice Test - 12 - Question 39
Keto-enol tautomerism is shown by carbonyl compounds having ∝-hydrogen atom.
NEET Practice Test - 12 - Question 40

Which one of the following is the correct order of interactions?

NEET Practice Test - 12 - Question 41

Which of the following is called Wilkinson's catalyst?

Detailed Solution for NEET Practice Test - 12 - Question 41
Wilkinson's catalyst is [RhCl](PPh3)3], Redviolet in colour and has square planar structure.

It is used for selective hydrogenation of organic molecules at room temperature and pressure.

TiCl4 + (C2H5)3 Al is Ziegler Natta catalyst.

NEET Practice Test - 12 - Question 42

How many isomeric naphthylamine es are expected in the following reaction ?

Detailed Solution for NEET Practice Test - 12 - Question 42
NEET Practice Test - 12 - Question 43

Match the columns

Detailed Solution for NEET Practice Test - 12 - Question 43

NEET Practice Test - 12 - Question 44

In van der Waal’s equation of state for a nonideal gas, the term that accounts for intermolecular forces is

Detailed Solution for NEET Practice Test - 12 - Question 44
van der Waal’s equation,

Here represents the intermolecular forces.

NEET Practice Test - 12 - Question 45

Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?

Detailed Solution for NEET Practice Test - 12 - Question 45
XeF6 + H2O XeOF4+ 2HF

XeF6 + 2H2O XeO2F2+ 4HF

XeF6 + 3H2O XeO3+ 6HF

NEET Practice Test - 12 - Question 46

Colemanite is

Detailed Solution for NEET Practice Test - 12 - Question 46
Colemanite is a mineral having composition as Ca2B6O11.5H2O
NEET Practice Test - 12 - Question 47

The plot given below is of the average power delivered to an LRC circuit versus frequency.

The quality factor of the circuit is :

Detailed Solution for NEET Practice Test - 12 - Question 47

Quality factor of the circuit

NEET Practice Test - 12 - Question 48

If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is

Detailed Solution for NEET Practice Test - 12 - Question 48
The energy required to remove the electron from the nth orbit of hydrogen is given by

Therefore the energy required to remove electron from n = 2 is + 3.4 eV.

NEET Practice Test - 12 - Question 49

A potentiometer wire PQ of 1 m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance 'r' and switch S (as shown in figure). With switch S open, the null position is obtained at a distance of 49 cm from Q. The potential gradient in the potentiometer wire is :

Detailed Solution for NEET Practice Test - 12 - Question 49

Here, Potential drop = 1.02

Balancing length from P = 100 – 49

NEET Practice Test - 12 - Question 50

Surface of a certain metal is first illuminated with light of wavelength λ1 = 350 nm and then, by light of wavelength λ2 = 540 nm. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of (2) The work function of the metal (in eV) is close to:

Detailed Solution for NEET Practice Test - 12 - Question 50
From Einstein’s photoelectric equation,

As per question, maximum speed of photoelectrons in two cases differ by a factor 2 From eqn. (i) & (ii)

NEET Practice Test - 12 - Question 51

A conducting circular loop made of a thin wire, has area 3.5 × 10 –3m2 and resistance 10W. It is placed perpendicular to a time dependent magnetic field B (t) = (0.4T) sin (50pt). The net charge flowing through the loop during t = 0 s and t = 10 ms is close to:

Detailed Solution for NEET Practice Test - 12 - Question 51
Net charge

= 1.4 × 10– 4 mC

NEET Practice Test - 12 - Question 52

A plane electromagnetic wave, has frequency of 2.0 × 1010 Hz and its energy density is 1.02 × 10– 8J/m3 in vacuum. The amplitude of the magnetic field of the wave is close to and speed of light = 3 × 108 ms–1) :

Detailed Solution for NEET Practice Test - 12 - Question 52
Energy density

= 160 nT

NEET Practice Test - 12 - Question 53

A 60 pF capacitor is fully charged by a 20 V supply. It is then disconnected from the supply and is connected to another uncharged 60 pF capacitor in parallel. The electrostatic energy that is lost in this process by the time the charge is redistributed between them is

Detailed Solution for NEET Practice Test - 12 - Question 53
In the first condition , electrostati c energy is

= 12´ 10 –9 J

In the second condition

Energy lost = Ui – Uf = 12×10–9J –6 × 10–9J = 6 nJ

NEET Practice Test - 12 - Question 54

The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become

Detailed Solution for NEET Practice Test - 12 - Question 54
According to Kepler ’s law of periods T2 µ R3

= 5 × 23 = 40 hours

NEET Practice Test - 12 - Question 55

Two monatomic ideal gases 1 and 2 of molecular masses m1 and m2 respectively are enclosed in separate containers of same volume kept at the same temperature. The ratio of the root mean square speed of molecules of gas 1 to that of gas 2 is given by

Detailed Solution for NEET Practice Test - 12 - Question 55

NEET Practice Test - 12 - Question 56

A car moves at a speed of 20 ms–1 on a banked track and describes an arc of a circle of radius 40√3 m. The angle of banking is (g = 10 ms–2)

Detailed Solution for NEET Practice Test - 12 - Question 56
Angle of banking is tan θ

tan θ =

∴ θ = 30º

NEET Practice Test - 12 - Question 57

A bird of mass 1.23 kg is able to hover by imparting a downward velocity 10 m/s uniformly to air of density r kg/m3 over an effective area 0.1 m2. If the acceleration due to gravity is 10 m/ s2, then the magnitude of r in kg/m3 is

Detailed Solution for NEET Practice Test - 12 - Question 57
For floating, we have

mg = rAv2

NEET Practice Test - 12 - Question 58

For a given material, the Young's modulus is 2. 4 times that of rigidity modulus. Its Poisson's ratio is

Detailed Solution for NEET Practice Test - 12 - Question 58
Y = 2η(1 + σ)

2.4h = 2η(1 + σ) ⇒ 1.2 = 1 + σ ⇒ σ = 0.2

NEET Practice Test - 12 - Question 59

Two particles are projected from the same point with the same speed u such that they have the same range R, but different maximum heights, h1 and h2. Which of the following is correct ?

Detailed Solution for NEET Practice Test - 12 - Question 59

For same range the angle of projections are

θ and 90° – θ So,

or R2 = 16 h1 h2

NEET Practice Test - 12 - Question 60

A body starts from rest with an acceleration a1.

After two seconds another body B starts from rest with an acceleration a2. If they travel equal distances in fifth second, after the starts of A, the ratio a1 : a2 will be equal to

Detailed Solution for NEET Practice Test - 12 - Question 60

Distance travelled in fifth second for first body = distance travelled in 3rd second for second body, S5 = S3

NEET Practice Test - 12 - Question 61

A moving coil galvanometer has a coil with 175 turns and area 1 cm2. It uses a torsion band of torsion constant 10–6 N-m/rad. The coil is placed in a magnetic field B parallel to its plane. The coil deflects by 1° for a current of 1mA. The value of B (in Tesla) is approximately:

Detailed Solution for NEET Practice Test - 12 - Question 61
Cθ = NBiA sin 90°

∴ B = 10–3 T

NEET Practice Test - 12 - Question 62

The half life of a radioactive substance is 20 minutes. The approximate time interval (t2 – t1) between the time t2 when ⅔ of it had decayed and time t1 when ⅓ of it had decayed is :

Detailed Solution for NEET Practice Test - 12 - Question 62
Number of undecayed atom after time t2 ;

...(i)

Number of undecayed atom after time t1;

...(ii)

NEET Practice Test - 12 - Question 63

A block of mass m attached to a massless spring is performing oscillatory motion of amplitude 'A' on a frictionless horizontal plane. If half of the mass of the block breaks off when it is passing through its equilibrium point, the amplitude of oscillation for the remaining system become fA.

The value of f is :

Detailed Solution for NEET Practice Test - 12 - Question 63
Potential energy of spring

Here, x = distance of block from mean position,

k = spring constant

At mean position, potential energy

At equilibrium position, half of the mass of block breaks off, so its potential energy becomes half.

Remaining energy =

Here, A' = New distance of block from mean position

NEET Practice Test - 12 - Question 64

When light falls on a given plate at angle of incidence of 60º, the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is then

Detailed Solution for NEET Practice Test - 12 - Question 64
Here i = 60º. As the angle between reflected and refracted ray is 90º, then i + r = 90° or r = 30º Now

NEET Practice Test - 12 - Question 65

To get an output 1 from the circuit shown in the figure, the input must be

Detailed Solution for NEET Practice Test - 12 - Question 65
A and B are the inputs of an OR gate. If A = 1, and B = 0, the output of OR gate will be 1. Now the output of OR gate along with C make the inputs of an AND gate.

Thus output of OR gate = 1, and C = 1, give the final output of AND gate as 1.

NEET Practice Test - 12 - Question 66

Three particles, each of mass m gram, are situated at the vertices of an equilateral triangle ABC of side l cm (as shown in the figure). The moment of inertia of the system about a line AX perpendicular to AB and in the plane of ABC, in gram-cm2 units will be

Detailed Solution for NEET Practice Test - 12 - Question 66
IAX = m(AB)2 + m(OC)2

= ml2 + m (l cos 60º)2

= ml2 + ml2/4 = 5/4 ml2

NEET Practice Test - 12 - Question 67

The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2. Calculate the power it radiates at 2000 K. (s = 5.67 × 10–8 W/m2 K4)

Detailed Solution for NEET Practice Test - 12 - Question 67
l = 10 cm = 0.1 m, d = 0.2 mm,

r = 0.1 mm = 1 × 10–4 m,

e = 0.2, T = 2000 K, s = 5.67 × 10–8 W/m2 K4

According to stefan's law of radiation, rate of emission of heat for an ordinary body,

E = σAeT4 = s(2 л r l) eT4 [A = 2prl]

= 5.67 × 10–8 × 2 × 3.14 × 1 × 10–4 × 0.1 × 0.2 × (2000)4

= 11.4 W

∴ Power radiated by the filament = 11.4 W

NEET Practice Test - 12 - Question 68

When a gas (y = 5/3) is heated under constant pressure, then what percentage of given heat energy will be utilised in doing external work?

Detailed Solution for NEET Practice Test - 12 - Question 68
ΔQ = ΔU + ΔW