List of top Chemistry Questions

A hypothetical galvanic cell is A$_{(s)}$ | A$^+$(1M) || B$^{+2}$(1M) | B$_{(s)}$ and emf of cell is positive. What is the possible cell reaction?
A first order reaction is 50% completed in 16 minutes. Find the percentage of reactant reacting in 32 minutes.
Calculate the equilibrium concentration of Pb$^{2+}$ ions in a solution of PbS containing 1 $\times$ 10$^{-11}$ moldm$^{-3}$ of sulphide ions. (Given $K_{sp}$ for PbS = 8.0 $\times$ 10$^{-28}$)}
The standard emf for cell, Cd$_{(s)}$ | Cd$^{+2}$(1M) || Cu$^{+2}$(1M) | Cu$_{(s)}$ is 0.74 V.
If concentration of Cd$^{+2}_{(aq)}$ and Cu$^{+2}_{(aq)}$ decreases by 10 times at 298 K. Calculate emf of cell.
Which from following polymers is biodegradable?
Identify secondary amine from following.
Calculate the number of unit cells in 0.79 g metal if product of density and volume of unit cell is 1.58 $\times$ 10$^{-22}$ g.
Calculate the osmotic pressure of 0.2 M aqueous solution of electrolyte at 300 K. If van't Hoff factor is 1.6 [R = 0.0821 atm dm$^3$ K$^{-1}$ mol$^{-1}$].
Calculate work done if 1 mole of an ideal gas expands isothermally from 2 dm$^3$ to 2.8 dm$^3$ against constant external pressure 1 atm.
Identify the product 'B' in the following sequence of reactions.
Ethanenitrile \( \xrightarrow{\text{SnCl}_2, \text{HCl}} \) A \( \xrightarrow{\text{H}_3\text{O}^+} \) B + NH\(_4\)Cl}
Identify 'A' in the following reaction.
A + Acetic anhydride \( \xrightarrow{\text{H}^+} \) Aspirin + Acetic acid}
Which of the following is NOT phenol?
Which among the following has lowest boiling point?
What is the number of node in 2s orbital?
Identify from following the correct set of thermodynamic conditions for the reaction to be spontaneous below equilibrium temperature.
Which from following mixtures obeys Raoult's law?
Identify the lanthanoid that exhibits zero effective magnetic moment in +3 state.
Identify correct decreasing order of basic strength of amines from following.
Identify a lowest field strength ligand from following.
Which from following is a polyester fibre?
Identify a lowest field strength ligand from following.
Find the number of moles of glycerol produced when \( n \) mole of triglyceride undergoes saponification.
What is the difference in molar masses of third and fourth homologues of alkane series?
What is shape of interhalogen compound so that central halogen exhibits +3 oxidation state?
What type of overlap is involved in the formation of C $-$ H bonds in acetylene molecules?