List of top Chemistry Questions asked in NEET (UG)

Given below are half-cell reactions:
\(MnO_4^- + 8H^+ + 5e^- → Mn^{2+} + 4H_2O\),
\(E°_{(Mn^{+2}/MnO_4^-)} = –1.510 V\)
\((\frac{1}{2})O_2 + 2H^+ + 2e^- → H_2O,\)
\(E°(O_2/H_2O) = +1.223 V\)
Will the permanganate ion, \(MnO_4^-\) liberate \(O_2\) from water in the presence of an acid?
The Kjeldahl' s method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
The incorrect statement regarding enzymes is:

Statement I: In the coagulation of a negative sol, the flocculating power of the three given ions is in the order - Al3+ > Ba2+ > Na+
Statement II: In the coagulation of a positive sol, the flocculating power of the three given salts is in the order - NaCl > Na2SO4 > Na3PO4
Choose the most appropriate answer from the options given below:

Assertion (A): In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason(R): In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
Choose the most appropriate answer from the options given below:
Identify the incorrect statement from the following
Which amongst the following is incorrect statement?
\(RMgX + CO_2 (\text{dry})→(\text{ether}) Y (H_3O^+)→ RCOOH\)
What is Y in the above reaction?
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:

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
Which of the following statement is not correct about diborane?
Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?
In one molal solution that contains 0.5 mole of a solute, there 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:

Which of the following p-V curve represents maximum work done?

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+

Match List - I with List- II.

 List-I (Drug class) List-II (Drug molecule)
(a)Antacids(i)Salvarsan
(b)Antihistamines(ii)Morphine
(c)Analgesics(iii)Cimetidine
(d)Antimicrobials(iv)Seldane
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)

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

Find the emf of the cell
Ni(s) + 2 Ag+ (0.001 M) → Ni2+ (0.001 M) + 2Ag(s)
(Given that E°cell = 1.05 V, \(\frac{2.303RT}{F} = 0.059\) at 298 K)
The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is
[Given pKa of CH3COOH = 4.57]

Match List - I with List - II.  

List - IList - II
(a) 2SO2 (g)+O2 (g) →2SO3(i) Acid rain 
(b)HOCl(g) h\(^\nu\)→OH+Cl(ii) Smog
(c)CaCO3+H2SO4→CaSO4+H2O+CO2(iii)Ozone
(d)NO2(g) \(^{h\nu}\)→NO(g)+O(g)(iv) Tropospheric

Choose the correct answer from the options given below.

Consider the above reaction and identify the missing reagent/chemical.

 

The structures of beryllium chloride in solid state and vapour phase, are :

The incorrect statement among the following is