List of top Chemistry Questions

The total number of 3-centre-2-electron bonds in \( B_4H_{10} \) is ________. (in integer).
An aqueous solution of aspirin (HA) is prepared at pH 7.4. The ratio of concentration of \( \text{A}^- \) and \( \text{HA} \) at equilibrium is ________. (round off to the nearest integer).
A 16 mW monochromatic light emits \( 4 \times 10^{16} \) photons in 1 second. When this light incident on a metal strip, photoelectrons are emitted. The wavelength of the emitted photoelectrons (in Å) is ________ (round off to one decimal place).
Consider the following reaction:
The CORRECT statement(s) related to mono-chlorination at carbon-2 position is/are
The equilibrium constant for isomerization of 1-butene to trans-2-butene at 27°C is ________ (round off to one decimal place).
Consider the following reaction:
The CORRECT pathway(s) involved in the reaction is/are
Among the following statements about cobalt complexes, which is/are CORRECT? Given: Atomic number of Co is 27
The CORRECT order of basicity for the following compounds is
A sample of benzene, contaminated with a non-volatile and non-ionic solute, boils at 0.31°C higher than that of pure benzene. The molality of the solute in the contaminated solution is ________ (round off to two decimal places).
Consider a second order reaction, \( 2A \rightarrow \text{Product} \).
The concentration of A is represented as \( [A] \).
Which of the following is the CORRECT plot for determining the rate constant for the above reaction?
Among the following, the one having smallest bond angle is
Which among the following has the least second ionization energy?
Which among the following metal ions has the highest enthalpy of hydration? (Assume the given metal ions have the same counter ion.) Given: Atomic numbers of Ti, V, Cr and Mn are 22, 23, 24 and 25, respectively.
Which of the following lanthanides are in tv screen.
Lanthanoid contraction can be observed in:

An alkene having molecular formula \( {C}_7{H}_{14} \) was subjected to ozonolysis in the presence of zinc dust. An equimolar amount of the following two compounds was obtained. The IUPAC name of the alkene is:
 

An electron moving with speed \( v \) and a photon with speed \( c \), have the same de-Broglie wavelength. The ratio of kinetic energy of the electron to that of the photon is:
Which of the following is not a permissible arrangement of electrons in an atom?
Rate of dehydration of alcohols follows the order:
The polymer used for optical lenses is:
In CsCl type structure, the co-ordination number of \( {Cs}^+ \) and \( {Cl}^- \) respectively are:
Which of the following order is not correct?
Water is:

The conjugate base of \( (\text{CH}_3)_2\text{NH}_2^+ \) is:

Which one of the following reactions will not result in the formation of a carbon-carbon bond?