List of top Chemistry Questions

For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the equilibrium constant Kc is 0.5 at 400 K. If [N₂] = 0.1 M, [H₂] = 0.2 M, and [NH₃] = 0.05 M, what is the reaction quotient Qc?
Which of the following molecules has a trigonal planar molecular geometry?
Which of the following is liquid at ordinary temperature?
Arrange the following bases in increasing order of their basic strength:

Sodium hydroxide
Magnesium hydroxide
Aluminium hydroxide
Ammonium hydroxide
Select the correct answer using the code given below:
The main constituent of vinegar is:
The correct order of increasing chemical reactivity of the following metals is:
Ammonia evolved from \(0.75\,\text{g}\) of the soil sample in the Kjeldahl’s method for nitrogen estimation neutralises \(10\,\text{mL}\) of \(1\,\text{M}\) \(H_2SO_4\). Find the percentage of nitrogen present in the soil.
The early attempt to classify elements as metals and non-metals was made by:
The long form of the periodic table consists of:
Which one of the following salts when dissolved in water makes the solution basic?
The octet rule is not valid for which one of the following molecules?
The rusting of an iron nail:
Which of the following pair is/are correctly matched?

Isotopes : Atoms with same atomic number but different atomic mass
Isobars : Atoms with same number of neutrons but different atomic number
Isotones : Atoms with same mass number but different atomic number
Select the correct answer using the code given below:
Which of the following is not a synthetic fibre?
Which one is a sublime substance?
Which one among the following statements about atoms is not correct?
The process of change of liquid state into gaseous state at constant temperature is known as:
The carbon bond length in benzene is:
The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with:
A compound of ‘A’ and ‘B’ crystallises in a cubic lattice in which ‘A’ atoms occupy the lattice points at the corners of the cube. The ‘B’ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is:
In countries nearer to polar region, the roads are sprinkled with \(\text{CaCl}_2\). This is:
In electrophilic aromatic substitution reaction, the nitro group is meta directing because it:
The one which decreases with dilution is:
A \(6%\) solution of urea is isotonic with:
Vapour pressure of pure ‘A’ is \(70\ \text{mm of Hg}\) at \(25^\circ\text{C}\). It forms an ideal solution with ‘B’ in which mole fraction of A is \(0.8\). If the vapour pressure of the solution is \(84\ \text{mm of Hg}\) at \(25^\circ\text{C}\), the vapour pressure of pure ‘B’ at \(25^\circ\text{C}\) is: