List of top Chemistry Questions asked in NEET (UG)

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

Which one of the following alcohols reacts instantaneously with Lucas reagent?

Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below:

A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is:
(Given atomic masses of A=64; B=40; C=32 u)

During the preparation of Mohr’s salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe²⁺ ion?

Arrange the following elements in increasing order of first ionization enthalpy:
Li, Be, B, C, N
Choose the correct answer from the options given below:

The compound that will undergo S_N1 reaction with the fastest rate is

The rate of a reaction quadruples when temperature changes from 27°c to 57°c. Calculate the energy of activation
Given R=8.314 J K-1 mol-1, log 4=0.6021

Match List I with List II

List-I (Conversion)		List-II  (Shape/geometry)
(A)	1 mol of H2O to O2	(I)	3F
(B)	1 mol of MnO-4 to Mn2+	(II)	2F
(C)	1.5 mol of Ca from molten CaCl2	(III)	1F
(D)	1 mol of FeO to Fe2O3	(IV)	5F

Choose the correct answer from the options given below:

Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate solution for 100 seconds is (Given : Molar mass of Cu : 63 g mol^–1 , 1 F = 96487 C)

The highest number of helium atoms is in

The plot of osmotic pressure II) vs concentration (mol L^–1 ) for a solution gives a straight line with slope 25.73 L bar mol^–1 . The temperature at which the osmotic pressure measurement is done is
(Use R = 0.083 L bar mol–1 K^–1 )

In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. 2NaHCO₃(s) → Na₂CO₃(s)+CO₂(g)+H₂O(g)
D. Cl₂(g) → 2Cl(g)
Choose the correct answer from the options given below:

The E° value for the Mn³⁺/Mn²⁺ couple is more positive than that of Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺ due to change of

Consider the following reaction in a sealed vessel at equilibrium with concentrations of
N₂ = 3.0 × 10^–3 M, O₂ = 4.2 × 10^–3 M and NO = 2.8 × 10^–3 M.
2NO_(g)⇋N2(g) + O_2(g) 
If 0.1 mol L^–1 of NO_(g) is taken in a closed vessel, what will be degree of dissociation (a) of NO_(g) at equilibrium?

The energy of an electron in the ground state (n=1) for He⁺ ion is -xJ, then that for an electron in n=2 state for Be³⁺ ion in J is:

Match List I with List II.

List I (Molecule)		List II (Number and types of bond/s between two carbon atoms)
A.	ethane	I.	one σ-bond and two π-bonds
B.	ethene	II.	two π-bonds
C.	carbon molecule, C2	III.	one σ-bonds
D.	ethyne	IV.	one σ-bond and one π-bond

Choose the correct answer from the options given below:

The work done during reversible isothermal expansion of one mole of hydrogen gas at 25^o C from pressure of 20 atmosphere to 10 atmosphere is:
(Given R=2.0cal K^-1 mol^-1)

Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI.
A) Al³⁺
B) Cu²⁺
C) Ba²⁺
D) Co²⁺
E) Mg²⁺
Choose the correct answer from the options given below

For given reaction:

‘P’ is

Identify the correct reagents that would bring about the following transformation.

Given below are two statements :
Statement I : [Co(NH₃)₆] ³⁺ is a homoleptic complex whereas [Co(NH₃)4Cl₂] ⁺ is a heteroleptic complex. 
Statement II : Complex [Co(NH₃)₆] ³⁺ has only one kind of ligands but [Co(NH₃)₄Cl₂] ⁺ has more than one kind of ligands. 
In the light of the above statements, choose the correct answer from the options given below

Identify the major product C formed in the following reaction sequence:

The products A and B obtained int he following reactions, respectively, are
3ROH+PCI₃→3RCI+A 
ROH+PCI₅→RCI+HCI+B

Which reaction is NOT a redox reaction?