List of top Chemistry Questions

99% of a first order reaction was completed in 32 minutes. When will 99.9% of the reaction complete?
Consider the equilibrium reactions:
The equilibrium constant, $K_c$, for the overall dissociation \[ H_3PO_4 \rightleftharpoons 3H^+ + PO_4^{3-} \] is:
Identify the correct set of molecules with zero dipole moment:
A first-order reaction is 25% complete in 30 minutes. How much time will it take for the reaction to be 75% complete?
Which of the following shows maximum hydrogen bonding?
Identify the product C in the series.
C$_6$H$_5$NO$_2 \xrightarrow{\text{Fe/HCl}} A \xrightarrow{\text{NaNO}_2\text{+HCl, } 273\text{ K}} B \xrightarrow{\text{H}_2\text{O, } 283\text{ K}} C$
The slope of Arrhenius Plot (\(\ln k\) v/s \(\frac{1}{T}\)) of the first-order reaction is \(-5 \times 10^3 \, K\). The value of \(E_a\) of the reaction is. Choose the correct option for your answer. [Given \(R = 8.314 \, JK^{-1}mol^{-1}\)]
Calculate the pH of a \(0.001\,M\) \(NaOH\) solution at \(298\,K\).
Many mining methods pollute water and air as _____ leak into the surrounding ecosystem.
What is the chemical formula of Bleaching Powder?
Plaster of Paris is obtained by heating gypsum at:
The IUPAC name of \( CH_3-CH_2-CH_2-CH_3 \) is:
Cinnabar is an ore of:
The process of heating the sulphide ore strongly in excess of air is called _____.
Which of the following is a balanced chemical equation?
The orbital which contain the electron with the following set of four quantum numbers \[ n=2,\ l=0,\ m_l=0,\ m_s=-\frac{1}{2} \] is ____.
VSEPRT theory was proposed by
The value of Planck's constant is
Which substance is used for softening permanent hardness of water?
Successive compounds in the homologous series differ by a _____ group.
44 gms of \( CO_2 \) contains how many molecules of \( CO_2 \)?
The quantum number which explains about shape of the orbital is:
5--8% solution of acetic acid in water is called:
The hydrocarbons that contain _____ group are called ketones.
The process of burning carbon or carbon compounds in excess of oxygen is called _____.