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NEET Practice Test - 24 - NEET MCQ


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180 Questions MCQ Test NEET Mock Test Series 2025 - NEET Practice Test - 24

NEET Practice Test - 24 for NEET 2024 is part of NEET Mock Test Series 2025 preparation. The NEET Practice Test - 24 questions and answers have been prepared according to the NEET exam syllabus.The NEET Practice Test - 24 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NEET Practice Test - 24 below.
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NEET Practice Test - 24 - Question 1

Higher order (>3) reactions are rare due to:

Detailed Solution for NEET Practice Test - 24 - Question 1
Reactions of higher order (>3) are very rare due to very less chances of many molecules to undergo effective collisions.
NEET Practice Test - 24 - Question 2

A compound of a metal ion Mx+ (Z = 24) has a spin only magnetic moment of √15 Bohr Magnetons. The number of unpaired electrons in the compound are

Detailed Solution for NEET Practice Test - 24 - Question 2
Magnetic moment

µ =

where n = number of unpaired electrons √15 =

∴ n = 3

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NEET Practice Test - 24 - Question 3

Iron sulphide is heated in air to form A, an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is

Detailed Solution for NEET Practice Test - 24 - Question 3
4FeS + 7O2 → 2Fe2O3 + 4SO2

It is dibasic

NEET Practice Test - 24 - Question 4

Which of the following is an expression of Raoult's law if PA is the partial pressure of the solvent in a solution. P0A is the partial pressure of pure solvent and if XA and XB are the mole fraction of the solute and the solvent respectively?

Detailed Solution for NEET Practice Test - 24 - Question 4
According to Raoult's law pA = p°A x xB (partial pressure of solvent is equal to pure pressure of solvent multiplied by mole fraction of solvent.
NEET Practice Test - 24 - Question 5

Phenol on reaction with Br2 in non-polar aprotic solvent furnishes

Detailed Solution for NEET Practice Test - 24 - Question 5
In presence of non-protic solvent such as CHCl3 or CCl4, concentration of electrophile (Br+) is less, hence reaction stops at the monobromo stage
NEET Practice Test - 24 - Question 6

Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts Hg2Cl2, Cr2(SO4)3, BaSO4 and CrCl3 respectively ?

Detailed Solution for NEET Practice Test - 24 - Question 6

Hence the correct order of solubilities of salts is

NEET Practice Test - 24 - Question 7

α-D-glucose and β-D-glucose differ from each other due to difference in one carbon with respect to its:

Detailed Solution for NEET Practice Test - 24 - Question 7
α-D-glucose and β-D-glucose difFer in the arrangement of groups around one carbon atom (C1) i.e. they differ in configuration at C1 , hence these are also known as anomers.
NEET Practice Test - 24 - Question 8

In which of the following Tyndall effect is not observed?

Detailed Solution for NEET Practice Test - 24 - Question 8
Sugar forms a homogeneous solution hence no Tyndall effect is exhibited.
NEET Practice Test - 24 - Question 9

The hypothetical complex chloro diaquatriamminecobalt (III) chloride can be represented as

Detailed Solution for NEET Practice Test - 24 - Question 9
The complex chlorodiaquatriammine cobalt (III) chloride can have the structure [CoC1(NH3)3(H2O)2]Cl2.
NEET Practice Test - 24 - Question 10

The pH of a solution is increased from 3 to 6; its H+ ion concentration will be

Detailed Solution for NEET Practice Test - 24 - Question 10
pH = 3 . [ H+] = 10-3; pH = 6 ∴ [H+] = 10-6.

Hence [H+] reduced by 10”3 times.

NEET Practice Test - 24 - Question 11

Identify the statement that is not correct as far as structure of diborane is concerned

NEET Practice Test - 24 - Question 12

Which one of the following compounds possesses the most acidic hydrogen?

Detailed Solution for NEET Practice Test - 24 - Question 12
Acidic strength ∝ —I, - M effect. Due to the strong - 1, and -M effect of three - COOCH3 groups, it has the most acidic Hydrogen.
NEET Practice Test - 24 - Question 13

Ozone is an important constituent of stratosphere because it:

Detailed Solution for NEET Practice Test - 24 - Question 13
Ozone absorbs U. V. Radiations harmful to human life.
NEET Practice Test - 24 - Question 14

Which of the following statements is correct?

Detailed Solution for NEET Practice Test - 24 - Question 14
Gluconic acid is obtained by partial oxidation of glucose by mild oxidising agent e.g. Tollen’s reagent, Fehling solution, Br2 water.

Gluconic acid can not form hemiacetal or acetal.

NEET Practice Test - 24 - Question 15

Which one of the following is an example of homogeneous catalysis?

Detailed Solution for NEET Practice Test - 24 - Question 15
In acid hydrolysis of methyl acetate all are present in one phase (liquid)
NEET Practice Test - 24 - Question 16

An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2 but does not form XCl5.

Which of the following is element X ?

Detailed Solution for NEET Practice Test - 24 - Question 16
Nitrogen can form NCl3, N2O5 Ca3N2 and not NCl5 since it has no d atomic orbitals in the valence shell.
NEET Practice Test - 24 - Question 17

Both geometrical and optical isomerisms are shown by

Detailed Solution for NEET Practice Test - 24 - Question 17
The compounds of the type M(AA)2B2 exhibit both geometrical and optical isomerism.
NEET Practice Test - 24 - Question 18

Which of the following is the strongest Lewis base?

NEET Practice Test - 24 - Question 19

Which of the following order is wrong?

Detailed Solution for NEET Practice Test - 24 - Question 19
The right sequence of I.E1 of Li < B < Be < C.
NEET Practice Test - 24 - Question 20

In which of the following sets, all the given species are isostructural?

Detailed Solution for NEET Practice Test - 24 - Question 20
All have tetrahedral structure.
NEET Practice Test - 24 - Question 21

Which of the following cannot be made by using Williamson’s synthesis?

Detailed Solution for NEET Practice Test - 24 - Question 21
The two components should be (CH3)3CONa + (CH3)3CBr. However, tert-alkyl halides tend to undergo elimination reaction rather than substitution leading to the formation of an alkene, Me2C = CH2
NEET Practice Test - 24 - Question 22

Match the columns

NEET Practice Test - 24 - Question 23

A metallic crystal crystallizes into a lattice containing a sequence of layers AB AB AB......Any packing of spheres leaves out voids in the lattice. What percentage of volume of this lattice is empty space?

Detailed Solution for NEET Practice Test - 24 - Question 23
In ABAB packing spheres occupy 74%. 26% is empty,
NEET Practice Test - 24 - Question 24

Which among the following factors is the most important in making fluorine the strongest oxidizing halogen?

Detailed Solution for NEET Practice Test - 24 - Question 24
The fluorine has low dissociation energy of F - F bond and reaction of atomic fluorine is exothermic in nature
NEET Practice Test - 24 - Question 25

Identify the incorrect statement:

Detailed Solution for NEET Practice Test - 24 - Question 25
The S6 molecule has a chair-form hexagon ring with the same bond length as that in S8, but with somewhat smaller bond angles i.e. bond lengths are same but bond angles are different.

NEET Practice Test - 24 - Question 26

The most electropositive metals are isolated from their ores by:

Detailed Solution for NEET Practice Test - 24 - Question 26
Most electropositive metals are obtained by electrolysis of their fused ionic salts.
NEET Practice Test - 24 - Question 27

Which of the following is not correctly matched?

Detailed Solution for NEET Practice Test - 24 - Question 27
Terylene is prepared by condensing terephthalic acid and ethylene glycol

NEET Practice Test - 24 - Question 28

The first ionization energies of alkaline earth metals are higher than those of the alkali metals.

This is because

NEET Practice Test - 24 - Question 29

The correct order of increasing acid strength of the compounds

Detailed Solution for NEET Practice Test - 24 - Question 29
The correct order of increasing acid strength

CH3. COOH > MeOCH2COOH > CH3COOH > (Me)2CH.COOH

Electron withdrawing groups increase the acid strength and electron donating groups decrease the acid strength.

NEET Practice Test - 24 - Question 30

Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H2O2 acts as a reducing agent in acid medium?

Detailed Solution for NEET Practice Test - 24 - Question 30
H2O2 acts as a reducing agent only in presence of strong oxidising agents (i,e., MnO4-) in acidic as well as alkaline medium.

NEET Practice Test - 24 - Question 31

In which of the following pairs, is there the greatest difference in the oxidation number of the underlined elements ?

Detailed Solution for NEET Practice Test - 24 - Question 31
O.N . of N in NO2 and N2O4 is +4

∴ difference is zero.

O.N. of P in P2O5 a n d P4O10 is +5 difference is zero

O.N. of N in N2O is +1 and in NO is +2. The difference is 1

O.N. of S in SO2 is +4 and in SO3 i s +6. The difference is +2.

NEET Practice Test - 24 - Question 32

Which of the following products is formed when benzaldehyde is treated with CH3MgBr and the addition product so obtained is subjected to acid hydrolysis

Detailed Solution for NEET Practice Test - 24 - Question 32
Aldehydes, other than formaldehyde, when treated with RMgX give 2° alcohols
NEET Practice Test - 24 - Question 33

The electronic configuration of elements A, B and C are [He] 2s1, [Ne] 3s1 and [Ar] 4s1 respectively. Which one of the following order is correct for IE1 (in kJ mol–1) of A, B and C?

NEET Practice Test - 24 - Question 34

Which metal is present in brass, bronze and German silver?

Detailed Solution for NEET Practice Test - 24 - Question 34
Copper is present in brass, bronze and german silver.
NEET Practice Test - 24 - Question 35

Which one of the following is most reactive towards nucleophilic substitution reaction?

Detailed Solution for NEET Practice Test - 24 - Question 35
More the stability of the carbocation, higher will be the reactivity of the parent chloride.
NEET Practice Test - 24 - Question 36

The rate constant of a zero order reaction is 2.0 × 10–2 mol L–1 s–1. If the concentration of the reactant after 25 seconds is 0.5 M. What is the initial concentration ?

Detailed Solution for NEET Practice Test - 24 - Question 36
For a zero order reaction

a - 0.5 = 0.5

a = 1.0M

NEET Practice Test - 24 - Question 37

Consider the reactions

(A) H2O2 + 2HI → I2 + 2H2O

(B) HOCl + H2O2 → H3O+ + Cl + O2 Which of the following statements is correct about H2O2 with reference to these reactions?

Hydrogen peroxide is ______ .

NEET Practice Test - 24 - Question 38

A balloon has a maximum capacity of 20 L. At one atmospheric pressure 10 L of air is filled in the balloon. It will burst when pressure is (assuming isothermal condition)

Detailed Solution for NEET Practice Test - 24 - Question 38
The balloon would burst when V > 20 L

P1V1 = P2V2

1 x 10 = P2 x 20

P2=0.5 atm (no bursting)

Thus, a pressure below 0.5 atm, it would burst,

NEET Practice Test - 24 - Question 39

Vapour pressure of benzene at 30°C is 121.8 mm.

When 15 g of a non volatile solute is dissolved in 250 g of benzene its vapour pressure decreased to 120.2 mm. The molecular weight of the solute (Mo. wt. of solvent = 78)

Detailed Solution for NEET Practice Test - 24 - Question 39
Given vapor pressure of pure solute

( P° ) = 121 .8 mm ;

Weight of solute ( w ) = 15 g

Weight of solvent (W) = 250 g; Vapour pressure of pure solvent (P) =120.2 mm and Molecular weight of solvent (Ml = 78

From Raoult’s law

=

or

NEET Practice Test - 24 - Question 40

Decomposition of H2O2 follows a first order reaction. In fifty minutes the concentration of H2O2 decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H2O2 reaches 0.05 M, the rate of formation of O2 will be:

Detailed Solution for NEET Practice Test - 24 - Question 40

For a first order reaction

Given a = 0.5 , (a - x) = 0.125, t = 50 min

= 2.78 x 10-2min-1

r = k[H2O2] = 2.78 x 10-2 x 0.05

= 1.386 x 10-3 mol min-1

Now,

=

= 6.93 x 10-4 mol min-1

NEET Practice Test - 24 - Question 41

In which case, van’t Hoff factor i remain unchanged ?

Detailed Solution for NEET Practice Test - 24 - Question 41
i Remains unchanged when number of ions before and after complex ion remains constant.

NEET Practice Test - 24 - Question 42

Consider the reaction sequence given below :

Which of the following statements is true?

Detailed Solution for NEET Practice Test - 24 - Question 42
First reaction is SN1 in which the rate does not depend on the cone of the nucleophile but depends on the reactant cone. Second reaction is the E2 reaction in which the rate depends on the cone of base as well as reactant concentration.

Therefore, changing the concentration of base will have no effect on rate of reaction (1).

NEET Practice Test - 24 - Question 43

For reaction aA → xP , when [A] = 2.2 mM, the rate was found to be 2.4 mMs–1. On reducing concentration of A to half, the rate changes to 0.6 mMs–1. The order of reaction with respect to A is :

Detailed Solution for NEET Practice Test - 24 - Question 43
When the concentration of reactant is reduced to half its initial value, the rate is reduced by 2.4/0.6 4 times

It means, rate ∝ [reactant]2

So, order of reaction = 2

NEET Practice Test - 24 - Question 44

The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is :

Detailed Solution for NEET Practice Test - 24 - Question 44

λ = h/v

h= 6.6 x 10-34J-s

m= 1000 kg

v = 36 km / hr

=

= 10 m/sec

NEET Practice Test - 24 - Question 45

Calculate the standard cell potential (in V) of the cell in which following reaction takes place:

Given that

Detailed Solution for NEET Practice Test - 24 - Question 45

NEET Practice Test - 24 - Question 46

Three masses are placed on the x-axis, mass of 300 g at origin, 500 g at x = 40 cm and 400 g at x = 70 cm. The distance of the centre of mass from the origin is

Detailed Solution for NEET Practice Test - 24 - Question 46

= 40 cm

NEET Practice Test - 24 - Question 47

The amplitude of the magnetic field of an electromagnetic wave is 2 x 10-7T. Its electric field amplitude if the wave is travelling in free space is

Detailed Solution for NEET Practice Test - 24 - Question 47
For electromagnetic wave,

FE = FM ⇒ eE = BeC ⇒ E = B.C

= 2 x 107 x 3 x 108 = 60 V /m

NEET Practice Test - 24 - Question 48

A body having an initial velocity of 10 m/s moving on a rough surface comes to rest after moving 50 m. What is the coefficient of friction between the body and surface? (g = 10 m/s2)

Detailed Solution for NEET Practice Test - 24 - Question 48
Use a = μg and v2 = u2 + 2as
NEET Practice Test - 24 - Question 49

Given, , if a convex lens of focal length 10 cm is placed in water, then its focal length in water is

Detailed Solution for NEET Practice Test - 24 - Question 49

[ fω is focal length of lens in water]

[ f is focal length of lens in air]

Dividing,

=

fw = 4 x f = 4 x 10 = 40 cm.

NEET Practice Test - 24 - Question 50

Hot water cools from 60°C to 50°C in the first 10 minutes and to 42°C in the next 10 minutes. The temperature of the surroundings is:

Detailed Solution for NEET Practice Test - 24 - Question 50
By Newton ’ s law of cooling

where θ0 is the temperature of the surrounding area.

Now, hot water cools from 60° C to 50° C in 10 minutes,

Again, it cools from 50°C to 42°C in next 10 minutes.

Dividing equations (i) by (ii) we get

θ0 = 10°C

NEET Practice Test - 24 - Question 51

Consider the following statement: When jumping from some height, you should bend your knees as you come to rest, instead of keeping your legs stiff. Which of the following relations can be useful in explaining the statement? Where symbols have their usual meanings.

Detailed Solution for NEET Practice Test - 24 - Question 51
If force acts for a short interval Δt,

then Δt =

NEET Practice Test - 24 - Question 52

The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nuclei is larger than that of helium by

Detailed Solution for NEET Practice Test - 24 - Question 52

= 2

NEET Practice Test - 24 - Question 53

The drift current in a p-n junction is

NEET Practice Test - 24 - Question 54

If the critical angle for total internal reflection from a medium to vacuum is 30°. Then velocity of light in the medium is

Detailed Solution for NEET Practice Test - 24 - Question 54

Velocity of light in the medium

=

= 1.5 x 108 m/s

NEET Practice Test - 24 - Question 55

The rain drops are in spherical shape due to

Detailed Solution for NEET Practice Test - 24 - Question 55
Rain drops are in spherical shape due to surface tension.
NEET Practice Test - 24 - Question 56

A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40º. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30º with the magnetic meridian.

In this position, the needle will dip by an angle

Detailed Solution for NEET Practice Test - 24 - Question 56

NEET Practice Test - 24 - Question 57

A car moves on a circular road. It describes equal angles about the centre in equal intervals of time.

Which of the following statements about the velocity of the car is true ?

Detailed Solution for NEET Practice Test - 24 - Question 57
As the body covers equal angles in equal time intervals. Its angular velocity and hence magnitude of linear velocity is constant.
NEET Practice Test - 24 - Question 58

A man measures the period of a simple pendulum inside a stationary lift and finds it to be T s. If the lift accelerates upwards with an acceleration g / 4, then the period of the pendulum will be

Detailed Solution for NEET Practice Test - 24 - Question 58

NEET Practice Test - 24 - Question 59

A body moves in a circular orbit of radius r under the action of a central force. Potential due to the central force is given by V(r) = kr (k is a positive constant). Period of revolution of the body is proportional to :

Detailed Solution for NEET Practice Test - 24 - Question 59
U = mV = kmr.

Force, F =

Now,

NEET Practice Test - 24 - Question 60

A charge q is moving with a velocity v parallel to a magnetic field B. Force on the charge due to magnetic field is

Detailed Solution for NEET Practice Test - 24 - Question 60

= qvB sinθ = 0 (because θ = 0°)

NEET Practice Test - 24 - Question 61

The frequencies of X-rays, γ-rays and ultraviolet rays are respectively a, b, and c. Then

Detailed Solution for NEET Practice Test - 24 - Question 61
γ rays have the lowest wavelength and highest frequency among them while ultraviolet rays have highest wavelength and lowest frequency.

Order of frequency: b > a > c

NEET Practice Test - 24 - Question 62

A circular coil ABCD carrying a current is placed in a uniform magnetic field. If the magnetic force on the segment AB is , the force on the remaining segment BCDA is

Detailed Solution for NEET Practice Test - 24 - Question 62
Here,

NEET Practice Test - 24 - Question 63

The separation between successive fringes in a double slit arrangement is x. If the whole arrangement is dipped under water what will be the new fringe separation? [The wavelength of light being used is 5000 Å]

Detailed Solution for NEET Practice Test - 24 - Question 63
When the arrangement is dipped in water;

NEET Practice Test - 24 - Question 64

A balloon contains 1500 m3 of helium at 27oC and 4 atmospheric pressure. The volume of helium at – 3oC temperature and 2 atmospheric pressure will be,

Detailed Solution for NEET Practice Test - 24 - Question 64

NEET Practice Test - 24 - Question 65

If c, the velocity of light, g the acceleration due to gravity and P the atmospheric pressure be the fundamental quantities in MKS system, then the dimensions of length will be same as that of

Detailed Solution for NEET Practice Test - 24 - Question 65

NEET Practice Test - 24 - Question 66

A sonometer wire supports a 4 kg load and vibrates in fundamental mode with a tuning fork of frequency 416 Hz. The length of the wire between the bridges is now doubled.

In order to maintain fundamental mode, the load should be changed to

Detailed Solution for NEET Practice Test - 24 - Question 66
Load supported by sonometer wire = 4 kg

Tension in sonometer wire= 4 g

If µ = mass per unit length

then frequency

When length is doubled, i.e., /' = 2l

Let new load = L

As, v' = v

NEET Practice Test - 24 - Question 67

A mass is tied to a string and rotated in a vertical circle. The minimum velocity of the body at the top is

Detailed Solution for NEET Practice Test - 24 - Question 67
Let velocity at A = vA and velocity at B = vB

Applying conservation of energy at A & B

Now as it is moving in a circular path it has centripetal force.

At point A

for minimum velocity T ≥ 0

or

NEET Practice Test - 24 - Question 68

The correct match between the entries in column I and column II are :

Detailed Solution for NEET Practice Test - 24 - Question 68
Energy sequence of radiations is

From the above sequence, we have

(a) Microwave → 10-3 m (iv)

(b) Gamma Rays → 10-15 m (ii)

(c) AM Radio wave → 100 m (i)

(d) X-Rays → 10-10m(iii)

NEET Practice Test - 24 - Question 69

A galvanometer can be changed into an ammeter by using

Detailed Solution for NEET Practice Test - 24 - Question 69
A galvanometer can be changed into an ammeter by the use of low resistance in parallel. So that ammeter does not draw much current which may change the magnitude of main current.
NEET Practice Test - 24 - Question 70

On the x-axis and at a distance x from the origin, the gravitational field due to a mass distribution is given by in the x-direction. The magnitude of gravitational potential on the x-axis at a distance x, taking its value to be zero at infinity, is :

Detailed Solution for NEET Practice Test - 24 - Question 70
Given: Gravitational field,

NEET Practice Test - 24 - Question 71

The fermi energy for a substance is

Detailed Solution for NEET Practice Test - 24 - Question 71
The highest energy level occupied by an electron in the energy band at zero kelvin is called Fermi level and the energy associated is known as Fermi energy. So, it is independent of T.
NEET Practice Test - 24 - Question 72

A metal piece is heated upto Tº abs. T h e temperature of the surrounding is tº abs.The heat in the surrounding due to radiation is proportional to

Detailed Solution for NEET Practice Test - 24 - Question 72
According to Stefan’ law heat emitted per second per unit area ∝ (T14 - T24) where T1 is the temperature o f body & T2 is the temperature of surrounding (T1 & T2 are on Kelvin scale).
NEET Practice Test - 24 - Question 73

A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40º. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30º with the magnetic meridian.

In this position, the needle will dip by an angle

Detailed Solution for NEET Practice Test - 24 - Question 73
Max. force = mass x max. Acceleration

=

=288 π2

NEET Practice Test - 24 - Question 74

According to Maxwell’s hypothesis, a changing electric field gives rise to

Detailed Solution for NEET Practice Test - 24 - Question 74
Changing electric field gives rise to displacement current which creates magnetic field around it.
NEET Practice Test - 24 - Question 75

A bucket full of hot water is kept in a room and it cools from 75ºC to 70ºC in T1 minutes, from 70ºC to 65ºC in T2 minutes and from 65ºC to 60ºC in T3 minutes. Then

(a)T1 = T2 = T3

(c)T1 > T2 > T3

Detailed Solution for NEET Practice Test - 24 - Question 75

The time of cooling increases as the difference between the temperature of the body & surrounding is reduced. So T1 < T2< T3 (according to New to n ’s law of cooling).