List of top Chemistry Questions

Consider the cell reaction, at 300 K.
A\(^+ (aq)\) + B\(^3+\) (aq) \(\rightleftharpoons\) A\(^2+\) (aq) + B (g) Its \(E^\circ\) is 1.0 V. The \(\Delta_r H^\circ\) of the reaction is -163 kJ mol\(^{-1}\). What is \(\Delta_r S^\circ\) (in J K\(^{-1}\) mol\(^{-1}\)) of the reaction?
(F = 96500 C mol\(^{-1}\))
The rate constant of a first order reaction was doubled when the temperature was increased from 300 to 310 K. What is its approximate activation energy (in kJ mol\(^{-1}\))?
(R = 8.3 J mol\(^{-1}\) K\(^{-1}\), \(\log 2 = 0.3\))
Which one of the following alkali metals is the weakest reducing agent as per their \( E^\circ \) values?
Match the pollutant in List I with its maximum permissible limit in drinking water given in List II.

maximum permissible limit in drinking water

Observe the following reaction: \[ ABO_3 (s) \xrightarrow{1000 K} AO (s) + BO_2 (g) \] The enthalpy change \( \Delta H \) for this reaction is \( x \) kJ mol\(^{-1} \). What is its \( \Delta U \) (in kJ mol\(^{-1}\)) at the same temperature? (R = 8.3 \text{ J mol}^{-1} \text{ K}^{-1})
100 mL of 0.1 M \( Fe^{2+} \) solution was titrated with \( \frac{1}{60} \) M \( Cr_2O_7^{2-} \) solution in acid medium. What is the volume (in L) of \( Cr_2O_7^{2-} \) solution consumed?
The number of lone pairs of electrons on the central atom of \( BrF_5 \), \( XeO_3 \), \( SO_3 \) respectively are:
An alcohol \( X \) (\( C_4H_{10}O \)) does not give turbidity with conc. HCl and ZnCl\(_2\) at room temperature. \( X \) on reaction with reagent \( Y \) gives \( Z \). What are \( X \), \( Y \), and \( Z \) respectively?
IUPAC names of the following compounds A and B are: \includegraphics[]{160.png}
Which of the following sets of reagents convert toluene to benzaldehyde? \includegraphics[]{158.png}
Cobalt (III) chloride forms a green-colored complex ‘X’ with NH\(_3\). Number of moles of AgCl formed when excess AgNO\(_3\) solution is added to 100 mL of 1M solution of ‘X’ is:
What are Y and Z respectively in the following reaction sequence? \begin{center} \includegraphics[]{155.png} \end{center}
Match List - I with List - II: \includegraphics[]{145.png}
\includegraphics[width=4cm]{148.png} X, Y are oxoacids of phosphorous. The number of P – OH bonds in X, Y respectively is:
The flux used in the preparation of wrought iron from cast iron in reverberatory furnace is:
What is the boiling point (in K) of the urea solution from the given graph?
The values of \( a \) and \( b \) in the solubility product equation for barium phosphate are:
Which one of the following statements is NOT correct about the compounds of alkaline earth metals?
The correct order of covalent bond character of \( BCl_3, CCl_4, BeCl_2, LiCl \) is:
The correct order of atomic radii of N, F, Al, Si is:
Which of the following sequence of reagents convert propene to 1-chloropropane?
The ratio of Xe: \( \text{F}_2 \) required in the above reaction is: \[ \text{Xe}(g) + 2\text{F}_2(g) \xrightarrow{873 \, K, 7 \, \text{bar}} \text{XeF}_4(s) \]
The type of iron obtained from the Blast furnace in the extraction of iron is:

At 298 K, the value of \( -\frac{d[Br^-]}{dt} \) for the reaction \[ 5Br^- (aq) + BrO_3^- (aq) + 6H^+ (aq) \rightarrow 3Br_2 (aq) + 3H_2O (l) \] is \( x \) mol \( L^{-1} \) min\(^{-1}\). What is the rate (in mol \( L^{-1} \) min\(^{-1}\)) of this reaction?

A metal catalyst (X) is used in the catalytic converter of automobiles. This prevents the release of gas Y into the atmosphere. What are X and Y respectively?