Explore topic-wise MCQs in NEET.

This section includes 1187 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following metal oxides is anti- ferromagnetic in nature?

A. \[Mn{{O}_{2}}\]
B. \[Ti{{O}_{2}}\]
C. \[V{{O}_{2}}\]
D. \[Cr{{O}_{2}}\]
Answer» B. \[Ti{{O}_{2}}\]
Discussion
2.

Equal volumes of the gases which do not react together are confined in separate vessels. The pressure is 200 mm and 400 mm of Hg respectively. If the two gases are mixed together what will be the pressure of the resulting mixture (temperature remaining constant)

A. 400 mm
B. \[\sqrt{400}\,mm\]
C. 300 mm
D. 200 mm
Answer» D. 200 mm
Discussion
3.

Under the influence of an electric field, heparticles in a sol migrate towards cathode. The coagulation of the same sol is studied using \[NaCl,N{{a}_{2}}S{{O}_{4}}\]and \[N{{a}_{3}}P{{O}_{4}}\] solutions. Their coagulating values will be in the order

A. \[NaCl>N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}\]
B. \[N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}>NaCl\]
C. \[N{{a}_{3}}P{{O}_{4}}>N{{a}_{2}}S{{O}_{4}}>NaCl\]
D. \[N{{a}_{2}}S{{O}_{4}}>NaCl>N{{a}_{3}}P{{O}_{4}}\]
Answer» B. \[N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}>NaCl\]
Discussion
4.

Lyophilic sols are more stable than lyophobic sols because:

A. the colloidal particles have positive charge
B. the colloidal particles have negative charge
C. the colloidal particles are solvated
D. there is strong electrostatic repulsion between the colloidal particles
Answer» D. there is strong electrostatic repulsion between the colloidal particles
Discussion
5.

Indicate whether each of the following pairs are identical or not?   (I)   (II)   (III)

A. I-enantiomers; II-diastereomers; III-enantiomers
B. I-identical; II-enantiomers; III-enantiomers
C. I-enantiomers; II-diastereomers; III-identical
D. I-enantiomers; II-identical; III-identical
Answer» B. I-identical; II-enantiomers; III-enantiomers
Discussion
6.

A heat engine carries one mole of an ideal mono-atomic gas around the cycle as shown in the figure. Select the correct option:

A. \[{{q}_{AB}}=450R\] and \[{{q}_{CA}}=-450R\]
B. \[{{q}_{AB}}=450R\] and \[{{q}_{CA}}=-225R\]
C. \[{{q}_{AB}}=450R\] and \[{{q}_{CA}}=-375R\]
D. \[{{q}_{AB}}=375R\] and \[{{q}_{CA}}=-450R\]
Answer» D. \[{{q}_{AB}}=375R\] and \[{{q}_{CA}}=-450R\]
Discussion
7.

The number of unpaired electrons in Gadolinium [Z=64] is

A. 3
B. 8
C. 6
D. 2
Answer» C. 6
Discussion
8.

The molar heat capacity \[\left( {{C}_{p}} \right)\] of \[C{{D}_{2}}O\] is 10 cals at 1000 K. The change in entropy associated with cooling of 32 g of \[C{{D}_{2}}O\] vapour from 1000 K to 100 K at constant pressure will be: (D = deuterium, atomic mass = 2 u)

A. \[23.03\text{ }cal\text{ }de{{g}^{-1}}\]
B. \[-23.03\text{ }cal\text{ }de{{g}^{-1}}\]
C. \[2.303\text{ }cal\text{ }de{{g}^{-1}}\]
D. \[-2.303\text{ }cal\text{ }de{{g}^{-1}}\]
Answer» C. \[2.303\text{ }cal\text{ }de{{g}^{-1}}\]
Discussion
9.

The electronic configuration of gadolinium (At. No. 64) is

A. \[[Xe]4{{f}^{8}}5{{d}^{1}}6{{s}^{2}}\]
B. \[[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\]
C. \[[Xe]4{{f}^{3}}5{{d}^{5}}6{{s}^{2}}\]
D. \[[Xe]4{{f}^{6}}5{{d}^{2}}6{{s}^{2}}\]
Answer» C. \[[Xe]4{{f}^{3}}5{{d}^{5}}6{{s}^{2}}\]
Discussion
10.

Number average molecular mass, \[{{\overline{M}}_{n}}\] and weight average molecular mass \[\left( {{\overline{M}}_{w}} \right)\] of synthetic polymers are related as

A. \[{{\overline{M}}_{n}}={{({{\overline{M}}_{w}})}^{1/2}}\]
B. \[{{\overline{M}}_{n}}={{\overline{M}}_{w}}\]
C. \[{{\overline{M}}_{w}}>{{\overline{M}}_{n}}\]
D. \[{{\overline{M}}_{w}}<{{\overline{M}}_{n}}\]
Answer» D. \[{{\overline{M}}_{w}}<{{\overline{M}}_{n}}\]
Discussion
11.

A 0.001 molal solution of\[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\] in water had a freezing point depression of\[0.0054{}^\circ C\]. If \[{{K}_{f}}\] for water is 1.80, the correct formulation for the above molecule is

A. \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{3}}]Cl\]
B. \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]C{{l}_{2}}\]
C. \[[Pt{{(N{{H}_{3}})}_{4}}Cl]C{{l}_{3}}\]
D. \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\]
Answer» C. \[[Pt{{(N{{H}_{3}})}_{4}}Cl]C{{l}_{3}}\]
Discussion
12.

In the laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine. The salt obtained is yellow in colour. The cause of yellow colour is:

A. Presence of \[N{{a}^{+}}\] ions in the crystal lattice
B. Presence of \[C{{l}^{-}}\] ions in the crystal lattice
C. Presence of electrons in the crystal lattice
D. Presence of face centred cubic crystal lattice.
Answer» D. Presence of face centred cubic crystal lattice.
Discussion
13.

Which of the following substances acts as an oxidising as well as a reducing agent?

A. \[N{{a}_{2}}O\]\[\]
B. \[SnC{{l}_{2}}\]
C. \[N{{a}_{2}}{{O}_{2}}\]
D. \[NaN{{O}_{2}}\]
Answer» E.
Discussion
14.

In a face centred cubic lattice, atoms of A form the corner points and atoms of B form the face centred points. If two atoms of A are missing from the corner points, the formula of the ionic compound is:

A. \[A{{B}_{3}}\]
B. \[A{{B}_{4}}\]
C. \[{{A}_{2}}{{B}_{5}}\]
D. \[A{{B}_{2}}\]
Answer» C. \[{{A}_{2}}{{B}_{5}}\]
Discussion
15.

For the graph below, select correct order of temperature?

A. \[{{T}_{1}}>{{T}_{2}}>{{T}_{3}}\]
B. \[{{T}_{2}}>{{T}_{3}}>{{T}_{1}}\]
C. \[{{T}_{3}}>{{T}_{2}}>{{T}_{1}}\]
D. \[{{T}_{1}}={{T}_{2}}={{T}_{3}}\]
Answer» D. \[{{T}_{1}}={{T}_{2}}={{T}_{3}}\]
Discussion
16.

\[CsBr\] has bcc structure with edge length 4.3. The shortest interionic distance in between \[C{{s}^{+}}\] and \[B{{r}^{-}}\]is

A. 3.72
B. 1.86
C. 7.44
D. 4.3
Answer» B. 1.86
Discussion
17.

A compound of a metal ion \[{{M}^{x+}}(Z=24)\] has a spin only magnetic moment of \[\sqrt{15}\]  Bohr Magnetons. The number of unpaired electrons in the compound are

A. 2
B. 4
C. 5
D. 3
Answer» E.
Discussion
18.

In allene \[({{C}_{3}}{{H}_{4}})\], the type(s) of hybridization of the carbon atoms is (are):

A. \[sp\] and \[s{{p}^{3}}\]
B. \[s{{p}^{2}}\] and \[sp\]
C. only \[s{{p}^{2}}\]
D. \[s{{p}^{2}}\] and \[s{{p}^{3}}\]
Answer» C. only \[s{{p}^{2}}\]
Discussion
19.

The heats of neutralisation of \[C{{H}_{3}}COOH\], \[HCOOH,\text{ }HCN\] and \[{{H}_{2}}S\] are\[-13.2,-13.4\], \[~-2.9\]  and \[-3.8\text{ }kcal\] per equivalent respectively. Arrange the acids in increasing order of strength

A. \[HCOOH>C{{H}_{3}}COOH>{{H}_{2}}S>HCN\]
B. \[C{{H}_{3}}COOH>HCOOH>{{H}_{2}}S>HCN\]
C. \[{{H}_{2}}S>HCOOH>C{{H}_{3}}COOH>HCN\]
D. \[HCOOH>{{H}_{2}}S>C{{H}_{3}}COOH>HCN\]
Answer» B. \[C{{H}_{3}}COOH>HCOOH>{{H}_{2}}S>HCN\]
Discussion
20.

Amongst the following, identify the species with an atom in + 6 oxidation state:

A. \[{{[Mn{{O}_{4}}]}^{-}}\]
B. \[{{\left[ Cr{{\left( CN \right)}_{6}} \right]}^{3-}}\]
C. \[C{{r}_{2}}{{O}_{3}}\]
D. \[Cr{{O}_{2}}C{{l}_{2}}\]
Answer» E.
Discussion
21.

Two vessels of volumes 16.4 L and 5 L contain two ideal gases of molecular existence at the respective temperature of \[27{}^\circ C\] and \[227{}^\circ C\] and exert 1.5 and 4.1 atmospheres respectively. The ratio of the number of molecules of the former to that of the later is

A. 2
B. 1
C. \[\frac{1}{2}\]
D. \[\frac{1}{3}\]
Answer» B. 1
Discussion
22.

Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using \[NaCl,\]\[N{{a}_{2}}S{{O}_{4}}\]  and \[N{{a}_{3}}P{{O}_{4}}\]solutions. Their coagulating values will be in maximum for:

A. \[NaCl\]
B. \[N{{a}_{2}}S{{O}_{4}}\]
C. \[N{{a}_{3}}P{{O}_{4}}\]
D. same for all
Answer» B. \[N{{a}_{2}}S{{O}_{4}}\]
Discussion
23.

The correct nucleophilicity order is

A. \[CH_{3}^{-}<NH_{2}^{-}<H{{O}^{-}}<{{F}^{-}}\]
B. \[CH_{3}^{-}\simeq NH_{2}^{-}>H{{O}^{-}}\simeq {{F}^{-}}\]
C. \[CH_{3}^{-}>NH_{2}^{-}>H{{O}^{-}}>{{F}^{-}}\]
D. \[NH_{2}^{-}>{{F}^{-}}~>H{{O}^{-}}>CH_{3}^{-}\]
Answer» D. \[NH_{2}^{-}>{{F}^{-}}~>H{{O}^{-}}>CH_{3}^{-}\]
Discussion
24.

\[CuS{{O}_{4}}\] reacts with KCN solution and forms

A. \[Cu\left( CN \right)\]
B. \[Cu{{\left( CN \right)}_{2}}\]
C. \[{{K}_{3}}[Cu{{\left( CN \right)}_{4}}]\]
D. \[{{K}_{4}}[Cu{{(CN)}_{6}}]\]
Answer» D. \[{{K}_{4}}[Cu{{(CN)}_{6}}]\]
Discussion
25.

Out of \[{{[Ti{{F}_{6}}]}^{2-}},{{[Co{{F}_{6}}]}^{3-}},C{{u}_{2}}C{{l}_{2}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\]of (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are:

A. \[C{{u}_{2}}C{{l}_{2}}\,\]and \[{{[NiC{{l}_{4}}]}^{2-}}\]
B. \[{{[Ti{{F}_{6}}]}^{2-}}\] and \[C{{u}_{2}}C{{l}_{2}}\,\]
C. \[{{[Co{{F}_{6}}]}^{3-}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\]
D. \[{{[Ti{{F}_{6}}]}^{2-}}\] and \[{{[Co{{F}_{6}}]}^{3-}}\]
Answer» C. \[{{[Co{{F}_{6}}]}^{3-}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\]
Discussion
26.

Which of the following orders is correct for heat of hydrogenation of these compounds?

A. I > II > III
B. III > II > I
C. II > III > I
D. III > I > II
Answer» D. III > I > II
Discussion
27.

In the solid state, MgO has the same structure as that of sodium chloride. The number of oxygens surrounding each magnesium in MgO is

A. 6
B. 1
C. 2
D. 4
Answer» B. 1
Discussion
28.

\[{{P}_{A}}\]and \[{{P}_{B}}\] are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If \[{{X}_{A}}\]represents the mole fraction of component A, the total pressure of the solution will be.

A. \[{{P}_{A}}+{{X}_{A}}({{P}_{B}}-{{P}_{A}})\]
B. \[{{P}_{A}}+{{X}_{A}}({{P}_{A}}-{{P}_{B}})\]
C. \[{{P}_{B}}+{{X}_{A}}({{P}_{B}}-{{P}_{A}})\]
D. \[{{P}_{B}}+{{X}_{A}}({{P}_{A}}-{{P}_{B}})\]
Answer» E.
Discussion
29.

Equal masses of methane and oxygen are mixed in an empty container at \[25{}^\circ C\]. The fraction of the total pressure exerted by oxygen is

A. \[1/2\]
B. \[2/3\]
C. \[\frac{1}{3}\times \frac{273}{298}\]
D. \[1/3\]
Answer» E.
Discussion
30.

One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) \[\to \] (4.0 atm, 5.0 L, 245 K) with a change in internal energy, \[\Delta U=30.0\text{ }L\]atm. The change in enthalpy \[\Delta H\]of the process in L atm is.

A. 40
B. 42.3
C. 44
D. Not defined because pressure is not constant
Answer» D. Not defined because pressure is not constant
Discussion
31.

1 gram equivalent of \[{{H}_{2}}S{{O}_{4}}\] is treated with 112 g of \[KOH\] for complete neutralization. Which of the following statements is correct?

A. 13.7 kcal of heat is evolved with the formation of 87 g of \[{{K}_{2}}S{{O}_{4}}\], leaving no KOH.
B. 27.4 kcal of heat is evolved with the formation of 87 g of \[{{K}_{2}}S{{O}_{4}}\], leaving 4 gram equivalent of KOH.
C. 15.7 kcal of heat is evolved with the formation of 1 gram equivalent of\[{{K}_{2}}S{{O}_{4}}\], leaving 56 g of KOH.
D. 13.7 kcal of heat is evolved with the formation of 87g of \[{{K}_{2}}S{{O}_{4}}\], leaving 1 gram equivalent of KOH.
Answer» E.
Discussion
32.

A drop of oil is placed on the surface of water. Which of the following statement is correct?

A. It will remain on it as a sphere
B. It will spread as a thin layer
C. It will be partly as spherical droplets and partly as thin film
D. It will float as a distorted drop on the water surface
Answer» C. It will be partly as spherical droplets and partly as thin film
Discussion
33.

Which is not the correct statement? (At. nos. Ce = 58, Lu = 71, La = 57, Yb= 70)

A. Colour of \[Y{{b}^{3+}}\] ion is pink.
B. \[L{{a}^{3+}}\] is diamagnetic.
C. \[C{{e}^{4+}}\] has \[{{f}^{0}}\] configuration.
D. \[L{{a}^{3+}}\]had \[{{f}^{14}}\] configuration.
Answer» B. \[L{{a}^{3+}}\] is diamagnetic.
Discussion
34.

What is the amount of heat (in Joules) absorbed by 18 g of water initially at room temperature heated to \[100{}^\circ C\]? If 10 g of Cu is added to this water, than decrease in temperature (in Kelvin) of water was found to be? C (p,m) for water\[75.32\text{ }J/mol\text{ }K\]; C (p,m) for \[Cu=24.47\text{ }J/mol\text{ }K.\]

A. 5649,369
B. 5544324
C. 5278,342
D. 3425425
Answer» B. 5544324
Discussion
35.

Which of the following is not an example of addition polymer?­­­

A. Polystyrene
B. Nylon
C. PVC
D. Polypropylene
Answer» C. PVC
Discussion
36.

Which of the following is not correctly represented?

A. Terylene
B. Nylon-6 , 6
C. Nylon-6,6
D. PMMA
Answer» B. Nylon-6 , 6
Discussion
37.

Given that(i) \[{{\Delta }_{f}}H{}^\circ \] of \[{{N}_{2}}O\] is \[82\text{ }kJ\text{ }mo{{l}^{-1}}\](ii) Bond energies of \[N\equiv N,N=N,O=O\] and \[N=O\] are 946, 418, 498 and \[607kJ\text{ }mo{{l}^{-1}}\] respectively, The resonance energy of \[{{N}_{2}}O\] is:

A. \[-88kJ\]
B. \[-66kJ\]
C. \[-62kJ\]
D. \[~-\,44\,kJ\]
Answer» B. \[-66kJ\]
Discussion
38.

Which of the following do not show disproportionation reaction? \[ClO_{4}^{-},\,{{F}_{2}},\,C{{l}_{2}},\,ClO_{2}^{-},\,ClO_{2}^{-},\,{{P}_{4}},\,{{S}_{8}}\] and \[Cl{{O}^{-}}\]

A. \[ClO_{2}^{-},\,ClO_{4}^{-},\] and \[Cl{{O}^{-}}\]
B. \[{{F}_{2}}\] only
C. \[{{F}_{2}}\] and \[ClO_{4}^{-}\]
D. \[ClO_{4}^{-}\] only
Answer» D. \[ClO_{4}^{-}\] only
Discussion
39.

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at\[25{}^\circ C\]. For this process, which of the following statement is correct?

A. The adsorption requires activation at \[25{}^\circ C\]
B. The adsorption is accompanied by a decrease in enthalpy
C. The adsorption increases with increase of temperature
D. The adsorption is irreversible
Answer» C. The adsorption increases with increase of temperature
Discussion
40.

In the following compounds(I) (II) (III) (IV) the order of basicity is:

A. IV > I > III > II
B. III > I > IV > II
C. II > I > III > IV
D. I > III > II > IV
Answer» E.
Discussion
41.

In which of the following compounds manganese has oxidation number equal to that of iodine in\[KI{{O}_{4}}\]?

A. Potassium manganite
B. Potassium permanganate
C. Manganous chloride
D. Manganese chloride
Answer» C. Manganous chloride
Discussion
42.

Which of the following is correct code for x and y in the following reaction.(i) x = oxidation reaction, y = reduction reaction(ii) x = gain of two electrons, y = loss of two electrons,(iii) x = reduction reaction, y = oxidation reaction(iv) x = loss of two electrons, y = gain of two electrons

A. (i) and (ii)
B. (i) and (iv)
C. (ii) and (iii)
D. (iii) and (iv)
Answer» C. (ii) and (iii)
Discussion
43.

A neon-dioxygen mixture contains \[70.6g\,O{{  }_{2}}\] and 167.5 g neon. If pressure of the mixture of gases in the cylinder is 25 bar. What is the partial pressure of \[{{O}_{2}}\] and Ne in the mixture respectively?

A. 5.25 bar, 10 bar
B. 19.75 bar, 5.25 bar
C. 19.75 bar, 10 bar
D. 5.25 bar, 19.75 bar
Answer» E.
Discussion
44.

Which of the following statements/relationships is not correct in thermodynamic changes?

A. \[\Delta U=0\] (isothermal reversible expansion of a gas)
B. \[w=-nRT\] In \[\frac{{{V}_{2}}}{{{V}_{1}}}\] (isothermal reversible expansion of an ideal gas)
C. \[w=nRT\] In \[\frac{{{V}_{2}}}{{{V}_{1}}}\] (isothermal reversible expansion of an ideal gas)
D. For a system of constant volume heat involved directly changes to internal energy.
Answer» D. For a system of constant volume heat involved directly changes to internal energy.
Discussion
45.

The favourable conditions for a spontaneous reaction are

A. \[T\Delta S>\Delta H,\Delta H=+ve,\text{ }\Delta S=+ve\]
B. \[T\Delta S>\Delta H,\text{ }\Delta H=+ve,\text{ }\Delta S=-ve\]
C. \[T\Delta S=\Delta H,\text{ }\Delta H=-ve,\text{ }\Delta S=-ve\]
D. \[T\Delta S=\Delta H,\text{ }\Delta H=+ve,\,\,\Delta S=+ve\]
Answer» B. \[T\Delta S>\Delta H,\text{ }\Delta H=+ve,\text{ }\Delta S=-ve\]
Discussion
46.

The appearance of colour in solid alkali meta halides is generally due to:

A. Schottky defect
B. Frenkel defect
C. Interstitial position
D. F-centres
Answer» E.
Discussion
47.

A solution of urea (mol. mass\[56g\text{ }mo{{l}^{-1}}\]) boils at \[100.18{}^\circ C\] at the atmospheric pressure. If \[{{K}_{f}}\] and \[{{K}_{b}}\] for water are 1.86 and \[0.512K\text{ }kg\text{ }mo{{l}^{-1}}\] respectively, the above solution will freeze at

A. \[0.654\text{ }{}^\circ C\]
B. \[-0.654\text{ }{}^\circ C\]
C. \[6.54\text{ }{}^\circ C\]
D. \[-6.54{}^\circ C\]
Answer» C. \[6.54\text{ }{}^\circ C\]
Discussion
48.

For preparing 0.1 N solution of a compound from its impure sample (percentage purity of which is known) weight of the substance required will be

A. less than the theoretical weight.
B. more than the theoretical weight.
C. same as the theoretical weight.
D. None of these
Answer» C. same as the theoretical weight.
Discussion
49.

Which of the following lanthanoid ions is diamagnetic? (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

A. \[S{{m}^{2+}}\]
B. \[E{{u}^{2+}}\]
C. \[Y{{b}^{2+}}\]
D. \[C{{e}^{2+}}\]
Answer» D. \[C{{e}^{2+}}\]
Discussion
50.

For the reaction: \[N{{H}_{3}}+OC{{l}^{-}}\xrightarrow{{}}{{N}_{2}}{{H}_{4}}+C{{l}^{-}}\] in basic medium, the coefficients of \[N{{H}_{3}},OC{{l}^{-}}\] and \[{{N}_{2}}{{H}_{4}}\] for the balanced equation are respectively

A. 2, 2, 2
B. 2, 2, 1
C. 2, 1, 1
D. 4, 4, 2
Answer» D. 4, 4, 2
Discussion