List of top Chemistry Questions

Match the Compounds (List - I) with the appropriate Catalyst/Reagents (List - II) for their reduction into corresponding amines. \includegraphics[width=1\linewidth]{b.png}

Consider the following cases of standard enthalpy of reaction (\( \Delta H_f^\circ \) in kJ mol\(^{-1}\)): \[ \text{C}_2\text{H}_6(g) + 7 \text{O}_2(g) \rightarrow 2 \text{CO}_2(g) + 3 \text{H}_2\text{O}(l) \quad \Delta H_1^\circ = -1550 \] \[ \text{C(graphite)} + \text{O}_2(g) \rightarrow \text{CO}_2(g) \quad \Delta H_2^\circ = -393.5 \] \[ \text{H}_2(g) + \frac{1}{2} \text{O}_2(g) \rightarrow \text{H}_2\text{O}(g) \quad \Delta H_3^\circ = -286 \] The magnitude of \( \Delta H_f^\circ \) of \( \text{C}_2\text{H}_6(g) \) is ____ kJ mol\(^{-1}\) (Nearest integer).

Consider the given figure and choose the correct option: \includegraphics[width=1\linewidth]{322.png}

\includegraphics[width=1\linewidth]{brc.png}

Given below are two statements: Statement (I): \textit{An element in the extreme left of the periodic table forms acidic oxides.}
Statement (II): \textit{Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.} In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: Statement (I): \textit{Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode.}
Statement (II): \textit{The rate of corrosion is more in alkaline medium than in acidic medium.} In the light of the above statements, choose the correct answer from the options given below:

Match List - I with List - II. List - I (Partial Derivatives) \quad List - II (Thermodynamic Quantity)

The most stable carbocation from the following is: \includegraphics[width=1\linewidth]{3333.png}

Both acetaldehyde and acetone (individually) undergo which of the following reactions?
A. Iodoform Reaction
B. Cannizzaro Reaction
C. Aldol Condensation
D. Tollen's Test
E. Clemmensen Reduction
Choose the correct answer from the options given below:

Given below are two statements:
Statement I: D-glucose pentaacetate reacts with 2,4-dinitrophenylhydrazine.
Statement II: Starch, on heating with concentrated sulfuric acid at 100°C and 2-3 atmosphere pressure, produces glucose.
In the light of the above statements, choose the correct answer from the options given below:

A weak acid HA has degree of dissociation x. Which option gives the correct expression of \(pH - pK_a\)?

Given below are two statements:

, intramolecular substitution takes place first by involving lone pair of electrons on nitrogen.

The compounds that produce CO$_2$ with aqueous NaHCO$_3$ solution are:

Which of the following oxidation reactions are carried out by both \( K_2Cr_2O_7 \) and \( KMnO_4 \) in acidic medium?
A. \( I^- \rightarrow I_2 \)
B. \( S^{2-} \rightarrow S \)
C. \( Fe^{2+} \rightarrow Fe^{3+} \)
D. \( I^- \rightarrow IO_3^- \)
E. \( S_2O_3^{2-} \rightarrow SO_4^{2-} \)
Choose the correct answer from the options given below:

The correct order of stability of following carbocations is:

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet color in non-luminous flame under hot condition in borax bead test is:

Consider the following elements In, Tl, Al, Pb, and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are: