List of top Chemistry Questions

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

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 ________ .

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

What are the most common electronic transition(s) associated with carbonyl functional group?
\(\alpha\rightarrow\pi\) 
\(\alpha\rightarrow n\) 
\(n \rightarrow \pi^*\)
\(\pi \rightarrow \pi^*\)

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:

Arachno and nido structure of Boranes have general formula respectively

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:

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

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

Choose the correct product formed in the following reaction

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

Oxidation of H2O to produce O2 is performed by

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

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:

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 vitamin is called as 'Tocopherol'.

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

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

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:

A solution containing 2.44 g of a solute dissolved in 75 g of water boils at 100.413°C Calculate the molar mass of the solute
K_b for water = 0.52 K kg mol^-1

Which of the following compound is ionic in nature and soluble in water?