List of top Chemistry Questions

Select the option which is correct about photochemical reaction:
A. Temperature has very little effect on rate of reaction.
B. The presence of light is the primary requirement.
C. AG may be positive or negative for spontaneous photochemical reaction.
D. Photochemical reaction always involves emission of light radiation.
Choose the correct answer from the options given below:

Membrane filters are not manufactured from which of following polymers

The following carbonyl compounds absorb IR radiations in the decreasing order.
A.
B.
C.
D.
Choose the correct answer from the options given below:

Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The surface tension of a liquid is the combined strength of the polar of dispersion forces that are pulling on the molecules in the surface of the liquid.
Reason R: The addition of small quantities ion of impurities will alter the surface tension.
In the light of the above statements, choose the most appropriate answer from the options given below:

The bond enthalpies for C-H, C1-C1, C-C1 and H-Cl are 99, 58, 78 and 103 kcal/mol respectively. What will be the AH for the reaction
CH_4(g) + Cl_2(g) → CH₃Cl_(g) + HCl_(g)

The structure of a carborane, \(C_2B_5H_7\), is

The hydrolysis products of \(Al_4,C_3\), and \(Be_2C\) are

The relative order of stability of conformers of 1,3-dimethylcyclohexane is (equatorial - e, axial-a)

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The moving boundary method yields more accurate data on transference number than does the Hittorf method.
Reason R: In moving boundary method, indicator electrolyte has same anion as principal electrolyte and is placed at the bottom due to its higher density.
In the light of the above statements, choose the most appropriate answer from the options given below:

For the reaction
2N₂O₅→4NO₂+0₂
Rate of the reaction is:

Choose the correct product formed in the following reaction

Number of C-O stretching frequency bands observed for M(CO)₆ : M(CO)₃L₃ (fac-isomer), M(CO)₃L₃ (mer- isomer), respectively are:

Match List I with List II

	List I (Books)		List II (Author)
A	Iron	I	Body water balance and nerve function
B	Calcium	II	Digestion and metabolism
C	Sodium	III	Constituent of haemoglobin
D	Zinc	IV	Blood clotting and nerve transmission

Choose the correct answer from the options given below:

Oxidation of H2O to produce O2 is performed by

Which of the following vitamin is called as 'Tocopherol'.

The conjugate base of a strong acid is a weak base and it has least tendency to accept a proton, which one is an example of strong acid?

Which of the following is most acidic from the mentioned material?

Solubility of gases (e.g oxygen in atmosphere) in liquid (e.g water in a river) is best explained by -

Choose the correct statements:
(A) The pH of unpolluted natural rain water is ~5.6
(B) \(H_2SO_4\) and \(HNO_3\) are predominat acids in acid rain
(C) Acidic rainwater have pH less than 5.6
(D) Acid rain affect monuments, buildings and soil fertility
(E) Neutral pH of unpolluted natural rain water is 7
Choose the correct answer from the options given below:

Which of the following zones in a river stretch will have highest biological oxidation demand?

For a particle in a square box of side 'l' and quantum numbers n₁=1, n₂=2, the most probable location of finding the particle is

A state (n₁, n₂ ) for a particle in a rectangular box with sides of length L₁ = L and L₂ = 2L that is accidentally degenerate with the state (4, 4) is

Van Arkel-De Boer process for purification of metals is based on thermal instability of

Which of the following anions on reaction with alkyl halide favor elimination over substitution, if effect of solvent is considered negligible?

In a nucleophilic substitution reaction proceeding via S_N2 mechanism, which among the following will act as good leaving group?