List of top Chemistry Questions

The angular momentum of electron in $3d$ orbital of an atom is

Freon used as refrigerant is

Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

Which of the following is an example of absorption?

Molecules of a noble gas do not possess vibrational energy because a noble gas

Which of the following reactions show the process of smelting?

Which of the following does not show electrical conductance?

The strength of ${H_2O_2}$ (in g/L) in 11.2 volume solution of ${H_2O_2 }$ is

A hypothetical electrochemical cell is shown below :- $\overset{T}{A}|A+(xM)||B^+(yM)|\overset{\oplus}{B}$ The emf measured is +0.20V. The cell reaction is:

Which of the following hormones contains iodine?

Which of the following is not true for $S_N1$ reaction ?

The $pH$ of the solution obtained by mixing $100\, ml$ of a solution of $pH = 3$ with $400\, ml$ of a solution of $pH = 4$ is

The correct order of electronegativities of $N, O, F$ and $P$ is

Sucrose is NOT a reducing sugar since

Power alcohol is a mixture of

Amongst \( \text{Ni(CO)}_4 \), \( [\text{Ni(CN)}_4]^{2-} \), and \( [\text{NiCl}_4]^{2-} \), which is paramagnetic?

In which of the following octahedral complexes of Co (At no. 27), will the magnitude of \( \Delta_o \) be the highest?

Assertion (A): \( \text{Cu}^{2+} \) and \( \text{Cd}^{2+} \) are separated by first adding KCN solution and then passing H\(_2\)S gas. Reason (R): KCN reduces \( \text{Cu}^{2+} \) to \( \text{Cu}^+ \) and forms a complex with it.

The effective atomic number of cobalt in the complex \( [\text{Co(NH}_3)_6]^{3+} \) is:

The IUPAC name for the complex \( [\text{Co(NO}_3)_6\text{NH}_3]^{3+} \) is:

The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is 4.5°C. Calculate the van't Hoff factor, \(i\), for this solution.

For the reaction \( 2A + B \rightleftharpoons C \), \( \Delta H = x \) cal, which one of the following conditions would favour the yield of C on the basis of Le-Chatelier's principle?

Which of the following is the correct comparison of the stability of the molecules?

Heat of formation, \( \Delta H_f \), of an explosive compound like NC\( _3 \) is:

For the reaction, \[ C_3H_8(g) + 5O_2(g) \rightarrow 3CO_2(g) + 4H_2O(l) \] at constant temperature, \( \Delta H = \Delta E \) is: