List of top Chemistry Questions

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

Membrane filters are not manufactured from which of following polymers

The following reaction undergoes via _________ and is known as ______ reaction.

The galvanic cell with the cell reaction
Mg(s) + 2Ag⁺ (0.001M)→ Mg²⁺ (0.65M) + 2Ag(s)
is correctly represented as

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)

Phenol derivatives can be prepared from corresponding chlorobenzene derivatives via nucleophilic substitution reaction only when it contains

The correct combination of enzyme and metal ion at the active site is

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:

A monochromatic radiation is incident on a solution of 0.05 molar concentration of an absorbing substance. The intensity of the radiation is reduced to one fourth of the initial value after passing through 10 cm length of the solution. Calculate the molar extinction. coefficient of the substance.

Choose the correct product formed in the following reaction

Which among the elements of Lanthanoid series often exhibit +4 oxidation state?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Concentrated HNO₃ is colourless but often turns yellow on keeping.
Reason R: Photo chemical decomposition of HNO₃ gives NO₂.
In the light of the above statements, choose the most appropriate answer from the options given below:

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:

The values of van't Hoff factors for NaCl, KCI and K₂SO₄, respectively are

Which of the following expression holds good for Freundlich adsorption isotherm ?

Identify the major product in the following reaction.

Find out the degree of dissociation of HF in 1 M aqueous solution. The value of K for the ionic equilibrium \(HF ⇌ H^++F^-\; is \;7.2 × 10^{-4.}\)

Identify the major product in the following reaction

Given below are two statements:
Statement I: To form interstitial alloys, the radius ratio of smaller atom/larger atom should be in the range 0.414-0.732.
Statement II: Two different metals having metallic radii differing only by 10% but similar crystal structures can form a good alloy.
In the light of the above statements, choose the most appropriate answer from the options given below:

Considering the following reactions and their reduction potentials in acidic medium

What will be the free energy change (\(\triangle\)G) of the reaction. \(IO^-_3\)→ \(\frac{1}{2}I_2\)

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

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

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

The phenomenon of existence of two or more compounds possessing the same molecular formula but different properties is referred as ________ .

Following anti-oxidant is used to prevent oxidative degradation of plastic :