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NEET Practice Test - 19 - NEET MCQ


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180 Questions MCQ Test NEET Mock Test Series 2025 - NEET Practice Test - 19

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NEET Practice Test - 19 - Question 1

CNis a strong field ligand. This is due to the fact that

Detailed Solution for NEET Practice Test - 19 - Question 1
CN is a strong field ligand as it is a pseudohalide ion. These ions are strong coordinating ligands and hence have the tendency to form σ-bond (from the pseudo halide to the metal) and ?-bond, (from the metal to pseudo halide)
NEET Practice Test - 19 - Question 2

Which property of white phosphorus is common to red phosphorous?

Detailed Solution for NEET Practice Test - 19 - Question 2
Except (a) all other properties are shown by white phosphorous.
NEET Practice Test - 19 - Question 3

0.4 moles of HCl and 0.2 moles of CaCl2 were dissolved in water to have 500 mL of solution, the molarity of Cl ion is:

Detailed Solution for NEET Practice Test - 19 - Question 3

Total Cl- moles = 0.4 + 0.4 = 0.8 moles

Molarity = Moles / Vol.in L

∴ Molarity of Cl- = 0.8/0.5 = 1.6 M.

NEET Practice Test - 19 - Question 4

Inductive effect involves

Detailed Solution for NEET Practice Test - 19 - Question 4
Inductive effect involves displacement of σ-electrons.
NEET Practice Test - 19 - Question 5

The decreasing order of stability of alkyl carbonium ion is in the order of:

Detailed Solution for NEET Practice Test - 19 - Question 5
Tertiary carbonium ion has highest stability followed by secondary and then primary carbonium ions. So, option (a) is correct.
NEET Practice Test - 19 - Question 6

Which of the following reagents convert propene to 1-propanol?

Detailed Solution for NEET Practice Test - 19 - Question 6
We know that

NEET Practice Test - 19 - Question 7

Which one of the following is NOT a buffer solution?

Detailed Solution for NEET Practice Test - 19 - Question 7
Buffer solution contains weak base + salt of weak base with strong acid or weak acid + salt of weak acid with strong base.

In option (d) the acid used is HClO4 which is a strong acid and KClO4 is salt of this acid with a strong base. So it is not an example of a buffer solution.

NEET Practice Test - 19 - Question 8

Which one of the following is expected to exhibit optical isomerism?

(en = ethylenediamine)

Detailed Solution for NEET Practice Test - 19 - Question 8

NEET Practice Test - 19 - Question 9

[Cr(H2O)6]Cl3 (at no. of Cr = 24) has a magnetic moment of 3.83 B. M. The correct distribution of 3d electrons in the Chromium of the complex is

Detailed Solution for NEET Practice Test - 19 - Question 9

3 .83 =

on solving n = 3

As per magnetic moment, it has three unpaired electrons

Cr3+ will have configuration as

Cr 1s2 Is2 2p6 3s2 3p6 3d4 4s2

Cr3+ 1s2 2s2 2p6 3s2 3p6 3d3.

So

NEET Practice Test - 19 - Question 10

Identify the reaction which does not liberate hydrogen:

Detailed Solution for NEET Practice Test - 19 - Question 10
(a) Lithium hydride reacts with diborane to produce lithium borohydride.

2LiH + B2H6 → 2LiBH4

NEET Practice Test - 19 - Question 11

When concentrated HCl is added to an aqueous solution of CoCl2, its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction?

Detailed Solution for NEET Practice Test - 19 - Question 11
Aqueous solution of CoCl2 contains [Co(H20)6]2+ which is pinkish in colour so option (d) is incorrect.

Reduction potential of Co3+ > Co2+ is high so option(b) is incorrect. Co2+ does not oxidize easily to Co3+.

It is a general case that symmetrical substituted octahedral complexes are less deeper in colour than tetrahedral complexes. So [CoCL]2- is deep blue in colour.

NEET Practice Test - 19 - Question 12

Hydrogen has an ionisation energy of 1311 kJ mol–1 and for chlorine it is 1256 kJ mol–1.

Hydrogen forms H+ (aq) ions but chlorine does not form Cl+ (aq) ions because.

Detailed Solution for NEET Practice Test - 19 - Question 12
Hydration energy of Cl+ is very less than H+ hence it doesn’t form Cl+ (aq) ion.
NEET Practice Test - 19 - Question 13

Equivalent weight of KMnO4 acidic medium, neutral medium and concentrated alkaline medium respectively are M/5, M/1, M/3. Reduced products can be

Detailed Solution for NEET Practice Test - 19 - Question 13

NEET Practice Test - 19 - Question 14

Which of the following statements is not correct for sigma and pi-bonds formed between two carbon atoms?

Detailed Solution for NEET Practice Test - 19 - Question 14
As sigma bond is stronger than the ?(pi) bond, so it must be having higher bond energy than ? (pi) bond.
NEET Practice Test - 19 - Question 15

The reactivity of metals with water is in the order of

Detailed Solution for NEET Practice Test - 19 - Question 15
There activity m a y be attributed to size factor, larger is the size, higher is tendency to lose electron (lowI.E.). Zn is the last element of the 3d series and it has larger size than Cu due to (3d104s2) configurations. Hence, the reactivity order is

N a > M g > Z n > F e > C u .

NEET Practice Test - 19 - Question 16

In Cannizzaro reaction given below

the slowest step is:

Detailed Solution for NEET Practice Test - 19 - Question 16

NEET Practice Test - 19 - Question 17

The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid (HIn) and base (In) forms of the indicator by the expression

Detailed Solution for NEET Practice Test - 19 - Question 17
For an acid-base indicator

or

Taking negative on both sides

or we can write pH =

or

NEET Practice Test - 19 - Question 18

An ideal gas expands in volume from 1×10–3 to 1 × 10–2 m3 at 300 K against a constant pressure of 1×105 Nm–2. The work done is

Detailed Solution for NEET Practice Test - 19 - Question 18
w = - PΔV = - 105(1x 10-2 - 1 x 10-3)

= -900J

NEET Practice Test - 19 - Question 19

Which one of the following statement is not true?

Detailed Solution for NEET Practice Test - 19 - Question 19
The ideal value of D.O for growth of fishes is 8 mg/L. 7mg/ L is the desirable range, below this value fishes get susceptible to disease. A value of 2 mg/L or below is lethal for fishes.
NEET Practice Test - 19 - Question 20

The heats of neutralisation of CH3COOH, HCOOH, HCN and H2S are – 13.2, – 13.4, – 2.9 and – 3.8 kcal per equivalent respectively. Arrange the acids in increasing order of strength

Detailed Solution for NEET Practice Test - 19 - Question 20
The greater the (negative value) of heat of neutralisation, the more is the strength of the acid. Hence,

HCOOH > CH3COOH > H2S >HCN

NEET Practice Test - 19 - Question 21

In sodium fusion test of organic compounds, the nitrogen of the organic compound is converted into

Detailed Solution for NEET Practice Test - 19 - Question 21
Sodium cyanide (Na + C + N —> NaCN).
NEET Practice Test - 19 - Question 22

Arrange the following elements in the order of ease of detection of wave properties, in the de Broglie experiment.

H, Li, Be, B, K

Detailed Solution for NEET Practice Test - 19 - Question 22
The wavelengths of elements decreases with increase in their mass.

NEET Practice Test - 19 - Question 23

Aluminium vessels should not be washed with materials containing washing soda since

Detailed Solution for NEET Practice Test - 19 - Question 23
Washing soda reacts with A1 to form soluble aluminate

2AI + Na2CO3 + 3H2O → 2NaAlO2 + CO2 + 3H2,

NEET Practice Test - 19 - Question 24

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

Detailed Solution for NEET Practice Test - 19 - Question 24
In blast furnace at about 1270K, calcium carbonate is almost completely decomposed to give CaO which acts as a flux and combines with SiO2 present as impurity (gangue) in the ore to form calcium silicate (fusible slag)

CaO(s) (basic flux) + SiO2 (s) (acidic flux) → CaSiO3 (s) (slag)

NEET Practice Test - 19 - Question 25

Which of the following statements is false?

Detailed Solution for NEET Practice Test - 19 - Question 25
The most abundant rare gas found in the atmosphere is argon and not helium.
NEET Practice Test - 19 - Question 26

The unpaired electrons in Ni(CO)4 are

Detailed Solution for NEET Practice Test - 19 - Question 26
Ni(CO)4. The O.S. of Ni is zero. Electronic configuration is [Ar] 3d84s24p° . In presence of strong ligand CO the pairing of electrons takes place and electronic configuration will be [Ar] 3d10,4s0 4p°. Hence unpaired electrons are zero.
NEET Practice Test - 19 - Question 27

Which one of the following cannot function as an oxidising agent?

Detailed Solution for NEET Practice Test - 19 - Question 27
If an electronegative element is in its lowest possible oxidation state in a compound or in free state. It cannot function as a powerful oxidising agent, e.g. I-
NEET Practice Test - 19 - Question 28

Which of the following compounds has the highest boiling point?

Detailed Solution for NEET Practice Test - 19 - Question 28
Molecules having higher molecular weight and less branching have higher boiling point.
NEET Practice Test - 19 - Question 29

Which one of the following statements is not true?

Detailed Solution for NEET Practice Test - 19 - Question 29
(Lactose contains p -glycosidic linkage between galactose and C4 of glucose.
NEET Practice Test - 19 - Question 30

The number of enantiomers of the compound CH3CH(Br)CH(Br)COOH is :

(a)2

(c)4

Detailed Solution for NEET Practice Test - 19 - Question 30
No, of asymmetric carbon = 2

No. of enantiomers = 22 = 4.

NEET Practice Test - 19 - Question 31

Which of these have no unit?

Detailed Solution for NEET Practice Test - 19 - Question 31
Electronegativity is the tendency of the atom to attract electrons to itself when combined in a compound as defined by Pauling. Electronegativity, is a relative term so it does not have any unit
NEET Practice Test - 19 - Question 32

Consider the Assertion and Reason given below.

Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins.

Reason (R) : High density polymers are closely packed and are chemically inert.

Choose the correct answer from the following :

Detailed Solution for NEET Practice Test - 19 - Question 32
(c) High density polythene is formed when addition polymerisation of ethene takes place in the presence of a catalyst (Ziegler Natta catalyst) at a high temp. (333K to 349 K) and under low pressure (6-7 atm).
NEET Practice Test - 19 - Question 33

The emf of Daniell cell at 298 K is E1 Zn | ZnSO4 (0.01 M) | | CuSO4 (1.0 M) | Cu When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the emf changed to E2 What is the relation between E1 and E2?

Detailed Solution for NEET Practice Test - 19 - Question 33
Using the relation

=

Substituting the given values in two cases.

Thus, E1 > E2

NEET Practice Test - 19 - Question 34

The correct order of atomic/ionic sizes is

Detailed Solution for NEET Practice Test - 19 - Question 34
Amongst the isoelectronic species, the anion having more negative charge would have the larger size.
NEET Practice Test - 19 - Question 35

In the lake test of Al3+ ion, there is formation of coloured floating lake. It is due to

Detailed Solution for NEET Practice Test - 19 - Question 35
In the lake test o f A l3+, there is formation of coloured floating lake. It is due to the adsorption of litmus by Al(OH)3.
NEET Practice Test - 19 - Question 36

For the graph below, select the correct order of temperature.

Detailed Solution for NEET Practice Test - 19 - Question 36

When temprature increases, extent of adsorption decreases

Temp↑ extent of adsorption↓

NEET Practice Test - 19 - Question 37

A and B in the following reactions are

Detailed Solution for NEET Practice Test - 19 - Question 37

NEET Practice Test - 19 - Question 38

If K1 and K2 are respective equilibrium constants for the two reactions

the equilibrium constant for the reaction will be

Detailed Solution for NEET Practice Test - 19 - Question 38
Reaction (It) and reverse of reaction (I) gives the desired reaction hence

NEET Practice Test - 19 - Question 39

Which of the following statements are correct?

(i) Cationic detergents have germicidal properties.

(ii) Bacteria can degrade the detergents containing highly branched chains.

(iii) Some synthetic detergents can give foam even in ice cold water.

(iv) Synthetic detergents are not soaps.

NEET Practice Test - 19 - Question 40

hence, ΔH°f [HS] is

Detailed Solution for NEET Practice Test - 19 - Question 40
ΔH° = ΔHf (products) - ΔHf (reactants)

x1= x (?) + x3 - x2

∴x = ( x1 + x2 - x3)

NEET Practice Test - 19 - Question 41

Two electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride, are connected in series. The ratio of iron deposited at cathodes in the two cells will be:

Detailed Solution for NEET Practice Test - 19 - Question 41
At cathodes : Fe+ 2e- →Fe;

Fe3+ + 3e-→ Fe

Hence,

NEET Practice Test - 19 - Question 42

The rate law for the reaction below is given by the expression k [A][B]

A + B → Product

If the concentration of B is increased from 0.1 to 0.3 mole, keeping the value of A at 0.1 mole, the rate constant will be:

Detailed Solution for NEET Practice Test - 19 - Question 42
Rate constant is independent of concentration.
NEET Practice Test - 19 - Question 43

If the boiling point of H2O is 373 K, the boiling point of H2S will be :

Detailed Solution for NEET Practice Test - 19 - Question 43
At room temperature, water is liquid and has boiling point 373 K due to hydrogen bonding. Whereas H2S is a gas and it has no hydrogen bonding. Hence the boiling point of H2S is less than 300 K (boiling point of H2S is -60°C).
NEET Practice Test - 19 - Question 44

The standard electrode poten tials of four elements A, B, C and D are –3.05, –1.66, –0.40 and +0.80. The highest chemical reactivity will be exhibited by :

Detailed Solution for NEET Practice Test - 19 - Question 44
Standard electrode potential i.e. reduction potential of A is minimum (-3.05V) i.e. its oxidation potential is maximum 'which implies ‘A’ is maximum reactive chemically.
NEET Practice Test - 19 - Question 45

A compound X, of boron reacts with NH3 on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating BF3 with lithium aluminium hydride. The compounds X and Y are represented by the formulas.

NEET Practice Test - 19 - Question 46

An electron (mass = 9 × 10–31 kg, charge = 1.6 × 10–19 C) moving with a velocity of 106 m/s enters a magnetic field. If it describes a circle of radius 0.1m, then strength of magnetic field must be

Detailed Solution for NEET Practice Test - 19 - Question 46

or

= 5.5 × 10–5 T

NEET Practice Test - 19 - Question 47

When an electron jumps from the fourth orbit to the second orbit, one gets the

Detailed Solution for NEET Practice Test - 19 - Question 47
When the electron jumps from any orbit to second orbit, then the wavelength of line obtained belongs to the Balmer series.
NEET Practice Test - 19 - Question 48

A ball of mass 150 g, moving with an acceleration 20 m/s2, is hit by a force, which acts on it for 0.1 sec. The impulsive force is

Detailed Solution for NEET Practice Test - 19 - Question 48
Mass = 150 gm = 150/1000 kg

Force = Mass x acceleration

= 150/1000 x 20N = 3N

Impulsive force = F. Δt = 3 x 0.1 = 0.3 N

NEET Practice Test - 19 - Question 49

Two identical galvanometers are taken, one is to be converted into an ammeter and other into a milliammeter. Shunt of milliammeter compared to ammeter is

Detailed Solution for NEET Practice Test - 19 - Question 49
The Shunt of milliammeter will be of larger resistance, because a large part of the main current will pass through the coil of the galvanometer which will work as a smaller range ammeter.
NEET Practice Test - 19 - Question 50

The moment of inertia of a disc of mass m and radius r about an axis, which is tangential to the circumference of the disc and parallel to its diameter is

Detailed Solution for NEET Practice Test - 19 - Question 50

We know that moment of inertia of a disc about its diameter is = 1/4mr2

In the figure AB is a diameter. Which passes through the centre of mass of the disc. CD is another axis which is parallel to AB and about which we shall have to calculate moment of inertia.

Now, from the theory of parallel axis

I = Ig + md2

= 1/4mr2 + mr2

= 5/4mr2

NEET Practice Test - 19 - Question 51

A convex lens of focal length 40 cm is held coaxially 12 cm above a mirror of focal length 18 cm. An object held x cm above the lens gives rise to an image coincident with it. Then x is equal to:

Detailed Solution for NEET Practice Test - 19 - Question 51
u = 24cm, v = x

Using

or

∴ x = 15cm

NEET Practice Test - 19 - Question 52

Under a constant torque the angular momentum of a body changes from A to 4A in 4 seconds. The torque on the body will be

Detailed Solution for NEET Practice Test - 19 - Question 52

Torque =

[dL is change in angular momentum]

NEET Practice Test - 19 - Question 53

The height at which the acceleration due to gravity becomes g/9 (where g = the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth, is

Detailed Solution for NEET Practice Test - 19 - Question 53
We know that

NEET Practice Test - 19 - Question 54

Figure shows a parallel plate capacitor and the current in the connecting wires that is discharging the capacitor.

Detailed Solution for NEET Practice Test - 19 - Question 54
According to conservation of charge, the displacement current must be leftward.

NEET Practice Test - 19 - Question 55

Solar radiation emitted by the sun resembles that emitted by a black body at a temperature of 6000 K. Maximum intensity is emitted at a wavelength of about 4800 Å. If the sun were to cool down from 6000 K to 3000K, then the peak intensity would occur at a wavelength

Detailed Solution for NEET Practice Test - 19 - Question 55
From Wien’s displacement law,

= 9600 Å

NEET Practice Test - 19 - Question 56

A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between them to take the particle far away from the sphere (Take G = 6.67 × 10–11Nm2/kg2)

Detailed Solution for NEET Practice Test - 19 - Question 56
Work done,

=

= 6.67 × 10–10 J

NEET Practice Test - 19 - Question 57

A particle is moving in a circle of radius r under the action of a force F = ⍺r2 which is directed towards centre of the circle. Total mechanical energy (kinetic energy + potential energy) of the particle is (take potential energy = 0 for r = 0) :

Detailed Solution for NEET Practice Test - 19 - Question 57
As we know, dU = F.dr

As,

m2v2 = m⍺r3

or,

Total energy = Potential energy + kinetic energy

Now, from eqn (i) and (ii)

Total energy = K.E. + P.E.

=

NEET Practice Test - 19 - Question 58

A uniform magnetic field acts at right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electron is doubled, then the radius of the circular path will be

Detailed Solution for NEET Practice Test - 19 - Question 58

As v is doubled, the radius also becomes double. Hence radius = 2 x 2 = 4 cm

NEET Practice Test - 19 - Question 59

If units of length and force are increased 4 times.

The unit of energy

Detailed Solution for NEET Practice Test - 19 - Question 59
The work done = force x displacement

∴ unit, u1 =Fs and u2 = 4F x 4s = 16u.

NEET Practice Test - 19 - Question 60

A transformer is employed to

NEET Practice Test - 19 - Question 61

A mass m is suspended from a spring of force constant k and just touches another identical spring fixed to the floor as shown in the figure. The time period of small oscillations is

Detailed Solution for NEET Practice Test - 19 - Question 61
When the spring undergoes displacement in the downward direction it completes one half oscillation while it completes another half oscillation in the upward direction. The total time period is

NEET Practice Test - 19 - Question 62

The coefficient of self inductance of a solenoid is 0.18 mH. If a core of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance will become nearly.

Detailed Solution for NEET Practice Test - 19 - Question 62
L= μ0nI

∴ L2 = μ1L1 = 900 x 0.18= 162 mH

NEET Practice Test - 19 - Question 63

In a dilute gas at pressure P and temperature T, the mean time between successive collisions of a molecule varies with T is :

Detailed Solution for NEET Practice Test - 19 - Question 63
Mean free path,

where, d= diameter of the molecule

n = number of molecules per unit volume

But, mean time of collision,

But

NEET Practice Test - 19 - Question 64

Figure shows a circuit in which three identical diodes are used. Each diode has forward resistance of 20 Ω and infinite backward resistance. Resistors R1 = R2 = R3 = 50 Ω. Battery voltage is 6 V. The current through R3 is

Detailed Solution for NEET Practice Test - 19 - Question 64
Here, diodes D1 and D2 are forward biased and D3 is reverse biased.

Therefore current through R3

= 50 mA

NEET Practice Test - 19 - Question 65

In a two dimensional motion , instantaneous speed v0 is a positive constant. Then which of the following is necessarily true?

NEET Practice Test - 19 - Question 66

A man is watching two trains, one leaving and the other coming with an equal speed of 4 m/s. If they sound their whistles each of frequency 240 Hz, the number of beats heard by man (velocity of sound in air = 320 m/s) will be equal to

(c)3

Detailed Solution for NEET Practice Test - 19 - Question 66
The apparent frequency of sound of both the trains will be changed.

The apparent frequency of sound of train coming in

=

For apparent frequency of train going away

=

When these sounds are heard simultaneously the beat is listened.

No. of beats per sec = 243 - 237 = 6.

NEET Practice Test - 19 - Question 67

Let E a be the electric field due to a dipole in its axial plane distant l and Eq be the field in the equatorial plane distant l', then the relation between Ea and Eq will be

Detailed Solution for NEET Practice Test - 19 - Question 67
We know that for short dipole,

Field at axial point,

and field at equatorial point,

So, Ea = 2Eq

NEET Practice Test - 19 - Question 68

A sphere of radius R has uniform volume charge density. The electric potential at a point (r < R) is