List of top Chemistry Questions

The pair of molecules / ions with the same bond order value is
How many of the following molecules have two lone pairs of electrons on central atom? SF\(_6\), BF\(_3\), ClF\(_3\), PCl\(_5\), BrF\(_5\), XeF\(_4\), H\(_2\)O, SF\(_4\)
The correct order of the non-metallic character among the elements B, C, N, F and Si is
Match the following polymers with their applications:
Match the following polymers with their applications: \begin{center} \begin{tabular}{|c|c|} \hline List-I (Polymer) & List-II (Used in making)
\hline
Consider the following: Statement-I: In the extraction of Al by Hall-Heroult process, pure \( Al_2O_3 \) mixed with \( Na_3AlF_6 \) lowers its melting point and increases conductivity. Statement-II: Zirconium metal is purified by zone refining method. The correct answer is:
Which of the following is not correct?
The adsorption of a gas on a solid surface follows Freundlich adsorption isotherm. At \( T \)(K), the gas pressure is \( 2 \) atm. What is the value of \( \frac{x}{m} \)? (\( n = 2 \) and \( k \) = constant)
In which one of the following complexes the metal ion has \( t_{2g}^3 e_g^2 \) configuration?
The composition of a sample of wustite is \( \text{Fe}_{0.93} \text{O}_{1.00} \). Percentage of iron in the form of \( \text{Fe}^{3+} \) ion is nearly:
Identify the reaction in which diborane is produced on an industrial scale:
Which set of elements form electron-precise hydrides?
The correct order of density of Be, Mg, Ca, Sr is:
Consider the following gaseous equilibrium reactions (I), (II) and (III) with equilibrium constants \( K_1 \), \( K_2 \), and \( K_3 \) respectively:
I) \( \frac{1}{2} N_2 + \frac{3}{2} H_2 \rightleftharpoons NH_3 \)
II) \( 2NO \rightleftharpoons N_2 + O_2 \)
III) \( H_2 + \frac{1}{2} O_2 \rightleftharpoons H_2O \)
The correct expression for the equilibrium constant for the gaseous equilibrium reaction: \[ 2NH_3 + \frac{5}{2} O_2 \rightleftharpoons 2NO + 3H_2O \]
Match the following pollutant concentration limits in water with their effects:
The sum of bond order values of \( C_2 \) and \( O_2^{2-} \) is \( x \), which is equal to the sum of bond order values of \( a, b, \) and \( c \). What are \( a, b, \) and \( c \)?
At \( 27^\circ C \) kinetic energy of 4 g of \( H_2 \) is \( x \) J. What is the kinetic energy (in J) of 6.4 g of oxygen at \( 127^\circ C \)?
What are X and Y respectively in the following set of reactions? X and Y respectively in the following set of reactions
The preferred reagent for the preparation of pure alkyl chloride from alcohol is
The correct statement regarding X and Y in the following set of reactions is
In the given reaction sequence conversion of Y to Z is
reaction sequence conversion of Y to Z is
Which of the following is used as froth stabilizer in froth floatation process?
In a colloidal solution, both the dispersed phase and dispersion medium are in liquid phase. What is the type of colloid?
Which method is used to purify liquids having very high boiling points and liquids which decompose at or below their boiling point?
Consider the following Statement-I : \( \text{Al}_2\text{O}_3 \) is amphoteric in nature. Statement-II : \( \text{Tl}_2\text{O}_3 \) is more basic than \( \text{Ga}_2\text{O}_3 \). The correct answer is