List of top Chemistry Questions

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:

Identify the infrared active molecules from the following
A. N₂
B. NO
C. CO
D. CO₂
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.

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

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

Match List I with List II:
     List I (Reaction)                                                                List II (Mettalo enzyme)
(A) \(R-H+O_2+2H^++2e^-R-OH+H_2O\)         (I) Cytochrome P-450
(B) \(2H_2O_2\rightarrow 2H_2O+O_2\)                                                 (II) Catalase
(C) e-transfer protein                                                           (III) Ferredoxin
(D) \(O_2+4H^++4e^- \rightarrow2H_2O\)                                     (IV)   Cytochrome (oxidase)
Choose the correct answer from the options given below:

Given below are two statements:
Statement I: For Na⁺ | K⁺ pump, the active ion transport involve three Na⁺ expelled out for two K⁺ ions intake across the cell membrane.
Statement II: Binding of K⁺ induces phosphorylation of ADP to ATP.
In the light of the above statements, choose the most appropriate answer from the options given below:

Identify the major product in the following reaction.

Deduce the structure of the product in the following reaction

Which of the following compound represent the correct structure of (2R, 3S)-2,3-pentanediol?

Identify the class of the following reaction.

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

Which of the following is NOT a cellulosic fibre?

Kronecker delta is defined by

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:

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

Which of the following orders are correct for noble gases?
A. Solubility in water He<Ne < Ar<Kr<Xe
B. Boiling points He< Ne <Ar<Kr <Xe
C. Chemical reactivity He > Ne >Ar> Kr > Xe
D. Enthalpy of vaporisation He> Ne > Ar> Kr> Xe
Choose the correct 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 experimental magnetic moment (3.4 BM) of a hydrated salt of \(Eu^{3+}\) at 300 K is significantly different from calculated value. The difference is due to (Given atomic number of \(E_u\) = 63)

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:

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

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:

Oxidation of H2O to produce O2 is performed by

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