List of top Chemistry Questions

The oxidation number of phosphorus in \( {Ba(H}_2{PO}_2)_2 \) is:
200 mL of an aqueous solution of a protein contains 1.26 g. The osmotic pressure of this solution at 300 K is found to be \( 2.57 \times 10^{-3} \, {bar} \). The molar mass of the protein will be: (R = 0.083 L bar mol\(^{-1}\) K\(^{-1}\))
The value of van der Waals constant ' a ' for gases \( {O}_2 \), \( {N}_2 \), \( {NH}_3 \), and \( {CH}_4 \) are 1.360, 1.390, 4.170, and 2.253 L\(^2\)atm/mol\(^2\) respectively. The gas which can most easily be liquefied is:

Molar conductance of monobromoacetic acid at infinite dilution is calculated to be \( x \times 10^{-4} \, \text{S m}^2 \, \text{mol}^{-1} \) \(\text{at 25°C.} \)The value of \( x \) is (round off to the nearest 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).
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
Consider the following reaction:
The CORRECT statement(s) related to mono-chlorination at carbon-2 position is/are
The total number of 3-centre-2-electron bonds in \( B_4H_{10} \) is ________. (in 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).
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).
Among the following statements about cobalt complexes, which is/are CORRECT? Given: Atomic number of Co is 27
Among the following, the one having smallest bond angle is
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?
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 among the following has the least second ionization energy?
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:
 

Which of the following is not a permissible arrangement of electrons in an atom?
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 order is not correct?
Rate of dehydration of alcohols follows the order:
In CsCl type structure, the co-ordination number of \( {Cs}^+ \) and \( {Cl}^- \) respectively are: