List of top Chemistry Questions

In the silver plating of copper, \( K[\text{Ag(CN)}_2] \) is used instead of \( \text{AgNO}_3 \). The reason is:

For the reaction \( 2N_2O_5 \rightarrow 4NO_2 + O_2 \), rate and rate constant are \( 1.02 \times 10^{-4} \, \text{mol} \, \text{lit}^{-1} \, \text{s}^{-1} \) and \( 3.4 \times 10^{-5} \, \text{s}^{-1} \), respectively when the concentration of \( N_2O_5 \) at that time will be:

What is order with respect to A, B, C, respectively?

The complex showing a spin-only magnetic moment of 2.82 B.M. is:

Standard cell voltage for the cell \[ \text{Pb} | \text{Pb}^{2+} | \text{Sn}^{2+} | \text{Sn} \] is \( -0.01 \, \text{V} \). If the cell is to exhibit \( E_{\text{cell}} = 0 \), the value of \( [\text{Sn}^{2+}] / [\text{Pb}^{2+}] \) should be:

The radius of \( \text{La}^{3+} \) (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of \( \text{Lu}^{3+} \) (Atomic number of Lu = 71)?

HBr reacts with \( \text{CH}_2 = \text{CH} - \text{OCH}_3 \) under anhydrous conditions at room temperature to give:

In a compound, atoms of element Y form ccp lattice and those of element X occupy \( \frac{2}{3} \)rd of tetrahedral voids. The formula of the compound will be:

\( p \)-cresol reacts with chloroform in alkaline medium to give the compound A which adds hydrogen cyanide to form the compound B. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is:

The resistance of a 0.01 N solution of an electrolyte was found to be 220 ohm at 298 K using a conductivity cell with a cell constant of 0.88 cm\(^{-1}\). The value of equivalent conductance of solution is:

Acetic anhydride reacts with diethyl ether in the presence of anhydrous AlCl₃ to give:

Which of the following is best method for reducing 3-bromopropanal to 1-bromopropane?

An element occurring in the bcc structure has \( 12.08 \times 10^{23} \) unit cells. The total number of atoms of the element in these cells will be:

The molecular formula of diphenyl methane, \( \text{C}_{13}\text{H}_{12} \), is \( \text{C}_{13}\text{H}_{12} \). How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?

The major product of the following reaction is:

Which one of the following has an optical isomer?

Calculate the enthalpy change for the change \( \text{S}_8(g) \rightarrow \text{S}_g(g) \), given that: \[ H_2S_2(g) \rightarrow 2H(g) + 2S(g), \quad \Delta H = 239.0 \, \text{kcal/mol} \] \[ H_2S(g) \rightarrow 2H(g) + S(g), \quad \Delta H = 175.0 \, \text{kcal/mol} \]

In the extraction of Cu, the metal is formed in the Bessemer converter due to the reaction: \[ \text{Cu}_2S + O_2 \rightarrow 2Cu + SO_2 \] The correct equation is:

For which of the following systems at equilibrium, at constant temperature, will the doubling of the volume cause a shift to the right?

The reagent(s) which can be used to distinguish acetophenone from benzophenone is (are):

Compound ‘A’ of molecular formula \( C_6H_10O \) on treatment with Lucas reagent at room temperature gives compound ‘B’. When compound ‘B’ is heated with alcoholic KOH, it gives isobutene. Compound ‘A’ and ‘B’ are respectively:

The chirality of the compound:

For the process \( H_2O(g) \, (1 \, \text{bar}, 373 \, \text{K}) \rightarrow H_2O(g) \, (1 \, \text{bar}, 373 \, \text{K}) \), the correct set of thermodynamic parameters is:

Which of the following compounds is formed when a mixture of \( K_2Cr_2O_7 \) and NaCl is heated with conc. \( H_2SO_4 \)?

Ionisation energy of \( \text{He}^+ \) is \( 19.6 \times 10^{-18} \, \text{J} \, \text{atom}^{-1} \). The energy of the first stationary state (n = 1) of \( \text{Li}^{2+} \) is: