List of top Chemistry Questions

The electrolyte used in $H_2 - O_2$ fuel cell is ________.

If at infinite dilution, molar conductivities of BaCl\(_2\), HCl and H\(_2\)SO\(_4\) are \( x_1 \), \( x_2 \), \( x_3 \) S cm\(^2\)mol\(^{-1}\) respectively, find solubility product of BaSO\(_4\). Given \( K_{\text{BaSO}_4} \) (Specific conductance) = \( x \) S cm\(^{-1}\)

In which of the following reactions, chlorine undergoes disproportionation? \[ \begin{aligned} \text{I.} \quad & \text{Reaction with cold, dilute NaOH} \\ \text{II.} \quad & \text{Reaction with hot, concentrated NaOH} \\ \text{III.} \quad & \text{Reaction with } \mathrm{H_2S} \end{aligned} \] The correct answer is

Which of the following complexes do not exhibit geometrical isomerism? \[ \begin{aligned} \text{I.} \quad & [\mathrm{CrF_2(H_2O)_4}]Cl_2 \\ \text{II.} \quad & [\mathrm{Co(en)_3}]^{3+} \\ \text{III.} \quad & [\mathrm{CoF(NH_3)_5}](\mathrm{NO_3})_2 \end{aligned} \] The correct answer is

Which of the following are the correct statements about lead storage battery? \[ \begin{aligned} \text{I.} \quad & \text{It is a secondary battery.} \\ \text{II.} \quad & \text{In this cell, the cathode is packed with } \mathrm{PbO_2} \text{ and the anode is filled with lead.} \\ \text{III.} \quad & \text{In this type } \mathrm{H_2SO_4} \text{ acts as electrolyte.} \\ \text{IV.} \quad & \text{During use of the battery, concentration of } \mathrm{H_2SO_4} \text{ decreases.} \end{aligned} \] The correct answer is

Consider the following polymerization reactions and the statements given about \(X\) and \(Y\). \[ \textbf{A.}\quad n\,\mathrm{C_6H_5CH=CH_2} \xrightarrow{\mathrm{RLi}} X \] \[ \textbf{B.}\quad n\,\mathrm{CH_2=CH-CH=CH_2} + n\,\mathrm{CH_2=CHCN} \xrightarrow{\mathrm{Peroxide}} Y \] \[ \begin{aligned} \textbf{I.}\quad & \text{The strength of intermolecular forces in } X>Y \\ \textbf{II.}\quad & X \text{ and } Y \text{ are synthetic rubbers} \\ \textbf{III.}\quad & X \text{ is a thermoplastic polymer and } Y \text{ is resistant to the action of petrol} \end{aligned} \] Correct statements are

Consider the following \[ \begin{aligned} \text{I.} \quad & \text{1-Bromo-1-phenylpropane} \\ \text{II.} \quad & \text{1-Bromo-3-}\mathit{n}\text{-butyl-2-methylbenzene} \end{aligned} \] Bromides I and II are classified respectively as

Which of the following are broad spectrum antibiotics? \[ \begin{aligned} \text{I.} \quad & \text{Chloramphenicol} \\ \text{II.} \quad & \text{Penicillin-G} \\ \text{III.} \quad & \text{Ofloxacin} \end{aligned} \] The correct answer is

In which of the following sets, reactant and reagent are correctly matched to get corresponding carboxylic acid? \[ \begin{array}{ll} \textbf{I.} & \mathrm{CH_3CH_2CH_2OH} \;\xrightarrow{\mathrm{CrO_3,\ H_2SO_4}}\; ? \\[2mm] \textbf{II.} & \mathrm{CH_3CH_2CH_2Br} \;\xrightarrow{\mathrm{CO,\ H_3O^+}}\; ? \\[2mm] \textbf{III.} & \mathrm{CH_3CHO} \;\xrightarrow{\mathrm{KMnO_4/OH^-,\ H_3O^+}}\; ? \end{array} \] The correct answer is

Which of the following sets contain atomic numbers of only representative elements? \[ \begin{aligned} \text{I.} \quad & 3,\;33,\;53,\;87 \\ \text{II.} \quad & 2,\;10,\;22,\;36 \\ \text{III.} \quad & 9,\;35,\;51,\;88 \\ \text{IV.} \quad & 17,\;25,\;37,\;48 \end{aligned} \] The correct answer is

Match the following. \[ \begin{array}{|c|c|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \begin{array}{l} \textbf{A.}\; \Delta_rH<0,\; \Delta_rS>0,\; \Delta_rG<0 \\ \textbf{B.}\; \Delta_rH<0,\; \Delta_rS<0,\; \Delta_rG<0 \\ \textbf{C.}\; \Delta_rH>0,\; \Delta_rS>0,\; \Delta_rG>0 \\ \textbf{D.}\; \Delta_rH>0,\; \Delta_rS<0,\; \Delta_rG>0 \end{array} & \begin{array}{l} \textbf{I.}\; \text{Non-spontaneous at low temperature} \\ \textbf{II.}\; \text{Spontaneous at high temperature} \\ \textbf{III.}\; \text{Non-spontaneous at all temperatures} \\ \textbf{IV.}\; \text{Spontaneous at low temperature} \end{array} \\ \hline \end{array} \]

Observe the following reaction \[ \mathrm{C_6H_5N_2Cl} \xrightarrow[\text{cold}]{X} Y \] \(Y\) reacts with aqueous NaOH solution and forms its sodium salt. What are \(X\) and \(Y\)?

What are \(X\) and \(Y\) respectively in the following reaction sequence? \((\mathrm{Me}=-\mathrm{CH_3})\) \[ Z \;(\text{Benzene}) \xrightarrow[\mathrm{AlCl_3}]{\mathrm{CH_3Br}} X \;(\text{Anisole}) \xrightarrow[\text{fusion}]{\mathrm{NaOH}} Y \]

What are \(A\) and \(B\) in the following set of reactions respectively? \[ Y \xrightarrow[\mathrm{AlCl_3}]{B} \text{Benzene} \xrightarrow[\mathrm{AlCl_3}]{A} X \] \[ X \text{ gives positive iodoform test.} \]

Observe the following reaction \[ \mathrm{PH_3(g)} \xrightarrow{\text{Light}} X+\mathrm{H_2} \] \[ \mathrm{PH_3(g)} \xrightarrow{300^\circ\mathrm{C}} X+\mathrm{H_2} \] Which of the following is NOT correct regarding \(X\)?

The hormone \((X)\) is a derivative of amino acid \(P\) \[ \mathrm{HO-C_6H_3(CH_2CH(NH_2)COOH)} \] and gland \((Y)\) where \(X\) is produced by is

Identify \(X\) and \(Y\) involved in the extraction of zinc from sphalerite in the sequence given below \[ \text{Sphalerite} \longrightarrow \text{Froth flotation} \longrightarrow X \longrightarrow \text{Reduction with coke} \longrightarrow Y \longrightarrow \text{Pure zinc} \]

Observe the following reaction sequence (major product). \[ \mathrm{CH_3CH_2CH_2Br} \xrightarrow{\mathrm{HBr}} Y \xrightarrow[\text{major}]{\mathrm{alc.\ KOH}} Z \] Correct statement regarding \(Z\) is