List of top Chemistry Questions

A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is (i) doubled, (ii) reduced to half?

How many grams of sodium chloride (NaCl) are produced when 2.0 moles of sodium (Na) react with excess chlorine gas (Cl$_2$? The balanced chemical equation for the reaction is: \[ 2 \, \text{Na} (s) + \text{Cl}_2 (g) \rightarrow 2 \, \text{NaCl} (s) \]

State Faraday’s second law of electrolysis. How much electricity is required in terms of Faraday for the reduction of 1 mole of $Cr_2\text{O}_7^{2-} \text{ to Cr}^{3+}$?

The role of a catalyst is to change _____________ .

Carbohydrates are polyhydroxy aldehydes or ketones that represent enormous structural diversity in terms of the arrangement of atoms in space, resulting in hundreds of stereoisomers. Although the chemical properties of most stereoisomers may not be very different, their metabolic rate and utilization in biological systems is significantly different and known to influence the overall carbohydrate metabolism. Structural variants, which arise due to a different arrangement of atoms in three-dimensional space are known as stereoisomers. The number of stereoisomers can be theoretically estimated by using the formula 2n, where ‘n’ is the number of stereocenters or asymmetric (chiral) carbon atoms in a molecule. Out of these stereoisomers, there are some structures, which are mirror images of each other, and they are referred to as enantiomers.

Werner’s coordination theory in 1893 was the first attempt to explain the bonding in coordination complexes. It must be remembered that this theory was put forward before the electron had been discovered by J.J. Thomson in 1897, and before the electronic theory of valency. Werner did not have any of the modern instrumental techniques and all his studies were made using simple experimental techniques. Werner was able to explain the nature of bonding in complexes and he concluded that in complexes, the metal shows two different sorts of valency: primary and secondary. Primary valences are normally ionisable whereas secondary valences are non-ionisable.

What is meant by denaturation of protein? Give an example.

Name the vitamin which is responsible for coagulation of blood.

Write the products formed in the following reactions:
CH3}CHO + dil. NaOH →

Write the products formed in the following reactions:
CH3COOH + Cl2/red P →

Write the products formed in the following reactions:
CH3CHO + NH2CONH2 →

Tertiary alkyl halides are least reactive towards SN2 reaction.

Account for the following:
p-dichlorobenzene has higher melting point than ortho and meta isomers.

Complete the following:
(CH3)3C - O - CH3 + HI →

Write the chemical equation for the following:
Nitration of anisole.

Write the chemical equation for the following:
Preparation of phenol from cumene.

For a reaction X + Y → Z, in which both X and Y follow first order kinetics; if the concentration of X is increased 2 times and concentration of Y is increased 3 times, how does it affect the rate of reaction?

Give a chemical test to distinguish between benzaldehyde and acetophenone.