List of top Chemistry Questions

If the wavelength for an electron emitted from H-atom is 3.3 × 10^–10 m, then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is ______ times. (Nearest integer)

Find out the major product for the above reaction.

 

The metal that has very low melting point and its periodic position is closer to a metalloid is

The metal that is not extracted from its sulfide ore is

The metal complex that is diamagnetic is (Atomic number : \(Fe, 26; Cu, 29\))

Hydrolysis of which compound will give carbolic acid?

In the estimation of bromine, 0.5 g of an organic compound gave 0.40 g of silver bromide. The percentage of bromine in the given compound is _____% (nearest integer)
(Relative atomic masses of Ag and Br are 108 u and 80 u, respectively).

Consider an imaginary ion \(\\_{22}^{48}X^{3−}\).The nucleus contains ‘a’% more neutrons than the number of electrons in the ion. The value of ‘a’ is ________. [nearest integer

For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two $2 p_z$ orbitals is(are)

Which element has more electron gain enthalpy among chalcogen group?

For the reaction H₂F₂(g) → H₂(g) + F2(g), ΔU = –59.6 kJ mol^–1 at 27°C. The enthalpy change for the above reaction is (–) _______ kJ mol–1 [nearest integer] Given: R = 8.314 J K–1 mol^–1.

The plot of pH-metric titration of weak base NH₄OH vs strong acid HCl looks lie:

The major product of the following reaction is

Match List-I with List -II

List - I	List - II
(A) \(ψ_{MO}=ψ_A-ψ_B\)	(I) Dipole moment
(B) \(µ=Q×r \)	(II) Bonding molecular orbital
(C) \(\frac{N_b-N_a}2\)	(III) Anti-bonding molecular orbital
(D) \(ψ_{MO}=ψ_A+ψ_B\)	(IV) Bond order

Choose the correct answer from options given below:

Arrange the following in increasing order of their covalent character. 
A. \(CaF_2\) 
B. \(CaCl_2\) 
C. \(CaBr_2\) 
D. \(Cal_2\)

Compound I is heated with Conc. HI to give a hydroxy compound A which is further heated with Zn dust to give compound B. Identify A and B.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) :
Assertion (A) : Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper.
Reason (R) : Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements, choose the correct answer from the options given below

Animal starch is the other name of

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Boric acid is a weak acid
Reason R: Boric acid is not able to release \(H^+\) ion on its own. It receives \(OH^–\) ion from water and releases \(H^+\) ion.
In the light of the above statements, choose the most appropriate answer from the options given below.

The correct decreasing order of energy for the orbitals having, following set of quantum numbers:
(A) n = 3, l = 0, m = 0
(B) n = 4, l = 0, m = 0
(C) n = 3, l = 1, m = 0
(D) n = 3, l = 2, m = 1

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

The major product in the given reaction is

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. 
Assertion A : \(LiF\) is sparingly soluble in water.
Reason R : The ionic radius of \(Li^+\) ion is smallest among its group members, hence has least hydration enthalpy.
In the light of the above statements, choose the most appropriate answer from the options given below.