List of top Chemistry Questions

IUPAC names of mesityl oxide and oxalic acid are respectively:
Which one of the following compounds does not give benzoic acid when treated with alkaline \( KMnO_4 \)?
The structure of the product 'Z' in the reaction sequence is: \[ \text{CHO} \] \[ \mid \] \[
Consider the following statements: Statement-I: Primary structure of protein represents its constitution. Statement-II: \( \alpha \)-Helix and \( \beta \)-pleated sheet structure of protein represent tertiary structure of it. The correct answer is:
Match the following polymers with their applications: \begin{center} \begin{tabular}{|c|c|} \hline List-I (Polymer) & List-II (Used in making)
\hline
Identify the correct set from the following:
The reaction of benzene diazonium chloride with Cu and HCl is known as:
In the given reaction sequence, conversion of Acetophenone (\( C_6H_5COCH_3 \)) to Ethylbenzene (\( C_6H_5CH_2CH_3 \)) is an example of: \[ \text{CH}_3\text{COC/} \] \[ \text{Anhy. AlCl}_3 \xrightarrow{\text{X}} \xrightarrow{\text{(1) N}_2\text{H}_4} Y \] \[ \Delta \xrightarrow{\text{(2) KOH / glycol}} \]
Match the following polymers with their applications:
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 amphoteric oxide of Vanadium (V) reacts with alkali and forms an oxoion \( X \) and with acid forms an oxoion \( Y \). The oxidation states of \( V \) in \( X \) and \( Y \) are respectively:
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?
Which one of the following acts as an autocatalyst during titration of \( KMnO_4 \) and oxalic acid in presence of dilute \( H_2SO_4 \)?
A \( \rightarrow \) B is a first-order reaction. The concentration of A is decreased from \( x \) mol \( L^{-1} \) to \( y \) mol \( L^{-1} \) in \( 100 \) min. What is the average velocity of the reaction in mol \( L^{-1} \) min\(^{-1}\)?
A solution of urea in water has a boiling point of \( 100.18^\circ C \). What is the freezing point of the same solution, if \( K_f \) and \( K_b \) of water are \( 1.86 \) and \( 0.52 \) K kg mol\(^{-1} \), respectively? (Boiling point of water = \( 100^\circ C \))
At \( T \)(K), the vapour pressure of pure benzene and toluene are \( 75 \) and \( 22 \) mm Hg respectively. 23.4 g of benzene and 64.4 g of toluene are mixed to form an ideal solution. If the vapours are in equilibrium with the liquid mixture, the mole fraction of toluene in vapour phase is:
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:
The element whose percentage composition in an organic compound can be determined by Carius method is:
\( x \) mg of an organic compound was analysed by Kjeldahl method. The ammonia evolved was absorbed in 50 mL of 0.5 M \( H_2SO_4 \). The unused acid required 60 mL of 0.5 M \( NaOH \) solution for complete neutralisation. If the percentage of nitrogen in the compound is \( 56 \), the value of \( x \) is:
At 298 K, the following reaction takes place for a cell at the hydrogen electrode: \[ H^+(aq) + e^- \longrightarrow \frac{1}{2} H_2 (1 \text{ bar}) \] The solution pH is 10.0. What is the hydrogen electrode potential in volts? (\(\frac{2.303RT}{F} = 0.06\) V)
Identify the reaction in which diborane is produced on an industrial scale:
When 30 mL of 0.2 M \( NH_4OH \) is added to 30 mL of 2 M \( NH_4Cl \) solution. If the pH of the buffer formed is 8.2, what is the \( pK_b \) of \( NH_4OH \)?
The correct order of density of Be, Mg, Ca, Sr is: