List of top Chemistry Questions

Which one of the following is an example of disproportionation reaction?
The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?
The major product of the following reaction is:
 Chemical Reaction With No2FI
Which of the following reactions will yield benzaldehyde as a product?
reactions will yield benzaldehyde as a product
s-block element which cannot be qualitatively confirmed by the flame test is
The measured BOD values for four different water samples (A-D) are as follows:
A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm;. The water samples which can be called as highly polluted with organic wastes, are
Which of the following statements are correct?
  1. The electronic configuration of Cr is [Ar] 3d54s1.
  2. The magnetic quantum number may have a negative value.
  3. In the ground state of an atom, the orbitals are filled in order of their increasing energies.
  4. The total number of nodes are given by n – 2.
Choose the most appropriate answer from the options given below :

Arrange the following in the decreasing order of their covalent character :

(A) LiCl

(B) NaCl

(C) KCl

(D) CsCl

Choose the most appropriate answer from the options given below :

Which of the following is a correct statement?
The electronic configuration of Pt(atomic number 78) is:
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

Match List-I with List-II.

List-I (Metal) 

 

 

List-II (Emitted light

 

wavelength (nm))

(A) Li (I) 670.8
(B) Na (II) 589.2
(C) Rb (III) 780.0
(D) Cs (IV) 455.5

Choose the most appropriate answer from the options given below:

Match List-I with List-II.

List-I (Metal)List-II (Application)
(A) Cs (I) High temperature thermometer
(B) Ga (II) Water repellent sprays
(C) B (III) Photoelectric cells
(D) Si (IV) Bullet proof vest

Choose the most appropriate answer from the options given below:

The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is:
The acid that is believed to be mainly responsible for the damage of Taj Mahal is
Two isomers ‘A’ and ‘B’ with molecular formula C4H8 give different products on oxidation with KMnO4/H+ results in effervescence of a gas and gives ketone. The compound ‘A’ is

In the given conversion the compound A is:

Given below are two statements:

Statement I: The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution.

Statement II: Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reaction.

Choose the most appropriate option

Consider the above reactions, the product A and product B, respectively are

The polymer, which can be stretched and retains its original status on releasing the force is
The correct order of nucleophilicity is
Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?

The major product in the following reaction is:
 

Fig. Chemical Reaction
Halogenation of which one of the following will yield m-substituted product with respect to methyl group as a major product?