List of top Chemistry Questions asked in NEET (UG)

Which of the following molecules has trigonal planar geometry?

A solution has a 1:4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be

Which one of the following oxides is expected to exhibit paramagnetic behaviour ?

The correct order of acid strength is

The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is :

Names of some compounds are given. Which one is not correct in IUPAC system ?

The mole fraction of the solute in one molal aqueous solution is:

Aniline in a set of reactions yielded a product D.
 

The structure of the product D would be:

The major organic product formed from the following reaction:

What is the correct relationship between the pH_s of isomolar solutions of sodium oxide (pH₁),sodium sulphide (pH₂),sodium selenide (pH₃) and sodium telluride (pH₄)?

At 25°C,the dissociation constant of a base, BOH, is 1.0 x 10^-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

Which one of the following pairs represents stereoisomerism ?

The aqueous solution containing which one of the following ions will be colourless?(Atomic no: Sc=21, Fe=26, Ti=22, Mn=25)

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?

A reaction occurs spontaneously if:

The correct sequence of increasing covalent character is represented by

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be:

Which of the following is the electron deficient molecule?

The surface tension of which of the following liquid is maximum

The absolute enthalpy of neutralisation of the reaction: MgO_(s)+2HCl_(aq) \(\rightarrow\) MgCl_2(aq)+H₂O (l) will be:

Which one of the following forms micelles in aqueous solution above certain concentration?

Electrolytic reduction of nitrobenzene weakly acidic medium gives:

Equilibrium constants K₁ and K₂ for the following equilibria: NO_(g)+\(\bigg(\frac{1}{2}\bigg)\)O₂ \(^{K_1}_\rightleftharpoons\) NO₂(g) and 2NO_2(g) \(^{K_2}_\rightleftharpoons\) 2NO_(g)+O_2(g) are related as: