List of top Chemistry Questions

The number of paramagnetic species among the following is ____B2,Li2,C2,C-2, O22--,O2+ and He2+

What is the hybridization of \([ {CrF}_6 ]^{3-}\)?
Water sample is reported to be highly polluted if BOD (Biological Oxygen Demand) value of sample becomes:
Write the mathematical equation for the first law of thermodynamics for Isothermal process, Adiabatic process. Derive the relationship between pH and pOH.
In the 1'H NMR spectrum of ethanol at 400 MHz, the methyl group splits into ___number of peaks.
Assuming the molecule shown below is aromatic, the value of "s" according to "Hückel's rule" is
an aromatic molecule
A double stranded DNA molecule of total 5000 base pairs long, has a melting temperature of 85 °C. What will be the % AT base pairs in this sample? (up to one decimal place).
Amongst the molecules given below, the total number of molecules that have at least one sp² hybridized atom is___.
\(C_6H_6, NO_2, BF_3, H_2O_2,SO_2,C_2H_2, L\) -Tryptophan
Major product formed in the given reaction is
Reaction
The stationary phase of cation-exchange chromatography can be
Components of a Transmission Electron Microscope are
The correct statement/s for bimolecular nucleophilic substitution reactions is/are
The order of increasing sizes of atomic radii among the elements O, S, Se, and As is:
Boric acid is polymeric due to:
Which of the following has correct increasing basic strength?
Among the following, the species having the smallest bond order is:
The correct order of thermal stability of hydroxides is:
Which of the following order is not correct for the ionic radii of the given species: \( {O}^{2-} \), \( {S}^{2-} \), \( {N}^{3-} \), \( {P}^{3-} \)?

The partial pressure of \( CH_3OH(g) \), \( CO(g) \), and \( H_2(g) \) in an equilibrium mixture for the reaction:

\[ CO(g) + 2H_2(g) \rightleftharpoons CH_3OH(g) \]

are 2.0, 1.0, and 0.1 atm respectively at \( 427^\circ C \). The value of \( K_p \) for the decomposition of \( CH_3OH \) to \( CO \) and \( H_2 \) is:

A catalyst is a substance which:
Which of the following is a non-reducing sugar?

The IUPAC name of the following compound is:

Which of the following is not present in a nucleotide?
Heroin is a derivative of:
An ideal gas expands against a constant external pressure of 2.0 atmosphere from 20 litre to 40 litre and absorbs 10 kJ of heat from the surrounding. What is the change in internal energy of the system? (given: \( 1 \, {atm-litre} = 101.3 \, {J} \))