List of top Chemistry Questions

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 correct order of increasing chemical reactivity of the following metals is:
The main constituent of vinegar is:
Which of the following is liquid at ordinary temperature?
The octet rule is not valid for which one of the following molecules?
Which one of the following salts when dissolved in water makes the solution basic?
The early attempt to classify elements as metals and non-metals was made by:
The long form of the periodic table consists of:
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:
In electrophilic aromatic substitution reaction, the nitro group is meta directing because it:
A \(6%\) solution of urea is isotonic with:
In countries nearer to polar region, the roads are sprinkled with \(\text{CaCl}_2\). This is:
The one which decreases with dilution is:
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:
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 the electrolysis of acidulated water, it is desired to obtain \(1.12\ \text{cc}\) of hydrogen per second under STP condition. The current to be passed is:
\(10^{-6}\,\text{M}\) NaOH is diluted 100 times. The pH of the diluted base is:

The molar mass of the water insoluble product formed from the fusion of chromite ore \(FeCr_2\text{O}_4\) with \(Na_2\text{CO}_3\) in presence of \(O_2\) is ....... g mol\(^{-1}\):