List of top Chemistry Questions asked in NEET (UG)

The pollution due to oxides of sulphur gets enhanced due to the presence of:

  1. Particulate matter
  2. Ozone
  3. Hydrocarbons
  4. Hydrogen peroxide.

Choose the most appropriate answer from the options given below:

In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from
Compound X on reaction with O3 followed by \(\frac{Zn}{H_2O}\) gives formaldehyde and 2-methyl propanal as products. The compound X is:
If radius of second Bohr orbit of the He+ ion is 105.8pm, What is the radius of third Bohr Orbit of Li2+ ion?
The correct IUPAC name of the following compound is
Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?

3O2 (g) ⇌ 2O3(g) for the above reaction at 298 K, Kc is found to be 3.0 x 10-59. If the conc. of O2 at equilibrium is 0.040 M then concentration of O3 in M is

The order of energy absorbed which is responsible for the color of complexes

  1. Ni(H2O)2(en)2]2+
  2. [Ni(H2O)4(en)]2+
  3. [Ni(en)3]2+
For a first order reaction A → Products, initial concentration of A is 0.1 M, which becomes 0.001M after 5 minutes. Rate constant for the reaction in min-1 is
A 10.0 L flask contains 64 g of oxygen at 27°C. (Assume O2 gas is behaving ideally). The pressure inside the flask in bar is (Given R = 0.0831 L bar K-1 mol-1)

Match List-I with List-II.

 List - I (Ores) List - II (Composition)
(a)Haematite(i)Fe3O3
(b)Magnetite(ii)ZnCO3
(c)Calamine(iii)Fe2O3
(d)Kaolinite(iv)[Al2(OH)4Si2O5]

Choose the correct answer from the options given below:

The given graph is a representation of kinetics of a reaction.
The y and x axes for zero and first order reactions, respectively are
Which of the following statement is not correct about diborane?

Match List - I with List- II. Choose the correct answer from the options given below:

 List - I (Hydrides) List - II (Nature)
(a)MgH2(i)Electron precise
(b)GrH4(ii)Electron deficient
(c)B2H6(iii)Electron rich
(d)HF(iv)Ionic
The incorrect statement regarding chirality is:

Match List - I with List- II.

 List-I (Products formed) List-II (Reaction of carbonyl compound with)
(a)Cyaniohydrin(i)NH2OH
(b)Acetal(ii)RNH2
(c)Schiff’s base(iii)alcohol
(d)Oxime(iv)HCN

Choose the correct answer from the options given below:

Statement I: The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions
Statement II: The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding.
In the light of the above statements choose the most appropriate answer from the options given below:
Which of the following sequence of reactions is suitable to synthesize chlorobenzene?

Match List-I with List-II.

 List - I List - II
(a)Li(i)Absorbent for carbon dioxide
(b)Na(ii)Electrochemical cells
(c)KOH(iii)Coolant in fast breeder reactors
(d)Cs(iv)Photoelectric cell

Choose the correct answer from the options given below:

Statement I: The boiling points of the following hydrides of group 16 elements increases in the order - H2O < H2S < H2Se < H2Te
Statement II: The boiling points of these hydrides increases with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below:
Which compound amongst the following is not an aromatic compound?
Assertion (A): ICl is more reactive than I2
Reason(R): I-Cl bond is weak than I-I bond
Choose the most appropriate answer from the options given below:
In one molal solution that contains 0.5 mole of a solute, there is
Identify the incorrect statement from the following.
At 298 K, the standard electrode potentials of Cu2+/Cu, Zn2+/Zn, Fe2+/Fe and Ag+/Ag are 0.34 V, - 0.76 V, - 0.44 V and 0.80 V, respectively.
On the basis of standard electrode potential, predict which of the following reaction cannot occur?