List of top Chemistry Questions

Give reasons for the following:
(a)The pH of aqueous NaCl increases when it is electrolyzed.
(b) Unlike dry cell, mercury cell has a constant cell potential through its lifetime.
(c) Conductivity of solution decreases with dilution.

The rate of a reaction:
A + B −→ product
is given below as a function of different initial concentrations of A and B.

Experiment\([A]\) (mol L\(^{-1}\))\([B]\) (mol L\(^{-1}\))Initial Rate (mol L\(^{-1}\) min\(^{-1}\))
10.010.01\(5 \times 10^{-3}\)
20.020.01\(1 \times 10^{-2}\)
30.010.02\(5 \times 10^{-3}\)
Assertion (A): Phenol is strongly acidic as compared to ethanol.
Reason (R): Phenoxide ion is more stable than ethoxide ion.
How do you explain the following?
(a) Presence of an aldehyde group in glucose.
(b) Presence of five –OH groups in glucose.
Draw the structures of major monohalo products in each of the following reactions:
methylbenzene (CH3C6H5)

\( \text{CH}_3\text{C}_6\text{H}_5 + \text{HI} \longrightarrow \) ?
(b) \( \text{C}_6\text{H}_6 + \text{Br}_2 \longrightarrow \) Heat or UV light ?
Differentiate between:
(i) Double salt and Complex compound
(ii) Didentate ligand and Ambidentate ligand
Observe the graph in the given figure and answer the following questions:
linear relationship between log |R0| and time.

(a) Predict the order of reaction.
(b) What is the slope of the curve?
Write IUPAC names of the following coordination compounds:
\([ \text{CoCl}_2(\text{en})_2]\text{SO}_4 \)
(ii) \( \text{K}_3[\text{Fe}(\text{C}_2\text{O}_4)_3] \)
(ii) Didentate ligand and Ambidentate ligand
Assertion (A): Boiling point of (CH₃)₃N is higher than that of CH₃CH₂CH₂NH₂.
Reason (R): Hydrogen bonding is more extensive in CH₃CH₂CH₂NH₂.
Which of the following cell converts the energy of combustion of fuel into electrical energy?
Assertion (A): Actinoids show wide range of oxidation states.
Reason (R): Actinoids are radioactive in nature.
The unit of rate and rate constant are the same for a:
Assertion (A): Hydrolysis of an ester follows first order kinetics.
Reason (R): The concentration of water does not get altered much during the reaction.
Pyranose ring of glucose is formed due to the reaction between:
Which of the following is the softest metal?
The freezing point of one molal KCl solution, assuming KCl to be completely dissociated in water, is: (\(K_f\) for water = 1.86 K kg mol\(^{-1}\))
A solution of acetone in ethanol:
Which one of the following amines gives an alcohol on reaction with HNO₂?
According to Werner’s theory of coordination compounds:
Which of the following complex ions is not optically active?
In the Hinsberg method for separation of primary, secondary, and tertiary amines, the reagent used is:
Which of the following compounds would be hydrolyzed by aqueous KOH most easily?
Williamson synthesis of preparing unsymmetrical ether is:
According to the generally accepted definition of the ideal solution there are equal interaction forces acting between molecules belonging to the same or different species. (This is equivalent to the statement that the activity of the components equals the concentration.) Strictly speaking, this concept is valid in ecological systems (isotopic mixtures of an element, hydrocarbons mixtures, etc.). It is still usual to talk about ideal solutions as limiting cases in reality since very dilute solutions behave ideally with respect to the solvent. This law is further supported by the fact that Raoult’s law empirically found for describing the behaviour of the solvent in dilute solutions can be deduced thermodynamically via the assumption of ideal behaviour of the solvent.
Ribose and 2-deoxyribose have an important role in biology. Among the most important derivatives are those with phosphate groups attached at the 5 position. Mono-, di- and tri-phosphate forms are important, as well as 3-5 cyclic monophosphates. Purines and pyrimidines form an important class of compounds with ribose and deoxyribose. When these purine and pyrimidine derivatives are coupled to a ribose sugar, they are called nucleosides.