List of top Chemistry Questions

Justify that the following reactions are redox reactions:

1. \(CuO(s) + H_2(g) \rightarrow Cu(s) + H_2O(g) \)
2. \(Fe_2O_3(s) + 3CO(g) \rightarrow 2Fe(s) + 3CO_2(g) \)
3. \(4BCl_3(g) + 3LiAlH_4(s) \rightarrow 2B_2H_6(g) + 3LiCl(s) + 3 AlCl_3 (s) \)
4. \(2K(s) + F_2(g) \rightarrow 2K+F^- (s) \)
5. \(4 NH_3(g) + 5 O_2(g) \rightarrow 4NO(g) + 6H_2O(g)\)

In Ostwald's process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can be obtained starting only with 10.00 g. of ammonia and 20.00 g of oxygen?

A carbamate contains:

One of the following aldehydes undergoes Cannizzaro’s reaction and reduces the Schiff’s reagent, but does not reduce Fehling’s reagent. That is

A tetrapeptide possesses _____ peptide bonds and can be ______ into amino acids fragments

Catalytic dehydrogenation of primary alcohol will produce a:

Which of the following has covalent bond?

Solubility product of CaC₂O₄ at a given temperature in pure water is 4×10^-9 (mol L^-1)². Solubility of CaC₂O₄ at the same temperature is:

Calculate the pH of the following solutions: 
a) 2 g of TlOH dissolved in water to give 2 litre of solution. 
b) 0.3 g of Ca(OH)₂ dissolved in water to give 500 mL of solution. 
c) 0.3 g of NaOH dissolved in water to give 200 mL of solution. 
d) 1mL of 13.6 M HCl is diluted with water to give 1 litre of solution

How much charge is required for the following reductions: 
  (i) 1 mol of Al³⁺  to Al. 
  (ii) 1 mol of Cu²⁺ to Cu. 
  (iii) 1 mol of MnO^-₄ to Mn²⁺ .

The total number of stereoisomers for the complex [Cr(ox)₂Clbr]³- (where oxalate) is:

How many of the following have 10 electrons: O^2-, O, Al³⁺, Al, F, F^-, Mg²⁺, Mg, N^-3

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason $R$
Assertion A: Amongst $He, Ne, Ar$ and $Kr$; $1 g$ of activated charcoal adsorbs more of $Kr$
Reason R: The critical volume $V_c\left( cm ^3 mol ^{-1}\right)$ and critical pressure $P_e$ (atm) is highest for Krypton but the compressibility factor at critical point $Z_c$ is lowest for Krypton 
In the light of the above statements, choose the correct answer from the options given below

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$
Assertion A : Hydrogen is an environment-friendly fuel
Reason R : Atomic number of hydrogen is 1 and it is a very light element
In the light of the above statements, choose the correct answer from the options given below

Which of the following represents the lattice structure of \(A _{0.95} O\) containing \(A ^{2+}, A ^{3+}\) and \(O ^{2-}\) ions?

Which of the following are the example of double salt?
A $FeSO _4 \left( NH _4\right)_2 SO _4 \cdot 6 H _2 O$
B $CuSO _4 4 NH _3 H _2 O$
C $K _2 SO _4 \cdot Al _2\left( SO _4\right)_3 \cdot 24 H _2 O$
D $Fe ( CN )_2 \cdot 4 KCN$
Choose the correct answer

Resonance in carbonate ion $\left( CO _3{ }^{2-}\right)$ is

Which of the following is true?

Choose the correct statement(s):
A Beryllium oxide is purely acidic in nature
B Beryllium carbonate is kept in the atmosphere of $CO _2$
C Beryllium sulphate is readily soluble in water
D Beryllium shows anomalous behavior
Choose the correct answer from the options given below:

Given below are two statements:
Statement I : Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode
Statement II : Chemical reactivity of an element can be determined by its reaction with oxygen and halogens
In the light of the above statements, choose the correct answer from the options given below

How can photochemical smog be controlled?

A solution of $FeCl _3$ when treated with $K _{ t }\left[ Fe ( CN )_6\right]$ gives a prussiun blue precipitate due to the formation of