List of top Chemistry Questions

Which of the following orders is not correct against the given property?
The hydrides of which group elements are examples of electron precise hydrides?
Which of the following will make a basic buffer solution?
At \(T\) K, the equilibrium constant for the reaction \[ {H}_2(g) + {Br}_2(g) \rightleftharpoons 2 {HBr}(g) \] is 1.6 \(\times\) 10\(^{1}\). If 10 bar of HBr is introduced into a sealed vessel at \(T\) K, the equilibrium pressure of HBr (in bar) is approximately:
What is the ratio of kinetic energies of \(3 \, {g}\) of hydrogen and \(4 \, {g}\) of oxygen at a certain temperature?
Among the following species, the correct set of isomolecular pairs are: \[ \mathrm{XeO}_3, \, \mathrm{CO}_3^{2-}, \, \mathrm{SO}_3, \, \mathrm{H}_3\mathrm{O}^+, \, \mathrm{ClF}_3 \]

Match the following elements with their correct classifications: 

If uncertainty in position and momentum of an electron are equal, then uncertainty in its velocity is:

The correct sequence of reactions involved in the following conversion is: 

Given below are two statements:
Statement I: Viscosity of liquid decreases with an increase in temperature.
Statement II: The units of viscosity are kg m-1 s-2.

 At 300 K, for the reaction A → P, the ∆Ssys is 5 J K-1 mol-1. What is the heat absorbed (in kJ mol-1) by the system?

Lithium forms an alloy with ‘X’. This alloy is used to make armor plates. What is ‘X’?
A polymer X is biodegradable and is obtained from the monomers Y, Z. What are Y and Z?
Chlorobenzene (X) when reacted with reagent ‘A’ gets converted to phenol (Y). The major product obtained from nitration of X gets converted to p-nitrophenol (Z) by reaction with reagent B. What are A and B respectively?

Match the following reactions with the product obtained from them: 

What are X and Y respectively in the following reaction sequence?  

Arrange the following in decreasing order of their acidity: 

What are X and Y in the following set of reactions?

An alkyl halide \( C_3H_7Cl \), on reaction with a reagent X, gave the major product Y (\( C_4H_7N \)). Y on hydrolysis released a gas, which turns red litmus to blue. What are X and Y?
In which of the following sets of molecules, the central atoms of molecules have same hybridisation?

A thermodynamic process (B \(\rightarrow\) E) was completed as shown below. The work done is equal to area under the limits. 

In a one litre flask, 2 moles of \( A_2 \) was heated to \( T(K) \) and the above equilibrium is reached. The concentrations at equilibrium of \( A_2 \) and \( B_2 \) are \( C_1(A_2) \) and \( C_2(B_2) \) respectively. Now, one mole of \( A_2 \) was added to flask and heated to \( T(K) \) to establish the equilibrium again. The concentrations of \( A_2 \) and \( B_2 \) are \( C_3(A_2) \) and \( C_4(B_2) \) respectively. What is the value of \( C_3(A_2) \) in mol L\(^{-1}\)? 

The correct statements among the following are: 

i. Saline hydrides produce \( \text{H}_2 \) gas when reacted with water. 
ii. Presently ~77% of the industrial dihydrogen is produced from coal. 
iii. Commercially marketed \( \text{H}_2 \text{O}_2 \) contains 3% \( \text{H}_2 \text{O}_2 \).

Identify the correct statements from the following:

Oxidation of NaBH_4 with \(I_2\) gives \(B_2H_6\)
(ii) \(B_2H_6\) burns in oxygen and releases an enormous amount of energy 
(iii) \(B_2H_6\) on hydrolysis gives a tribasic acid

The anode and cathode used in electrolytic refining of copper respectively are: