List of top Chemistry Questions

The following reactions show the $ H_{2}O_{2} $ behaviour in I and II reactions as: I. $ PbS(s) + 4 H_{2}O_{2} (aq) \to PbSO_{4}(s) + 4H_{2}O(l) $ II. $ HOC1 + H_{2}O_{2} \to H_{3}O^{+} + Cl^{-} + O_{2} $

What will be the half-cell potential of a hydrogen electrode acting as an anode and dipped in a solution of $ pH = 2 $ ?

Which of the following is correct for Lactose?

Which of the following is substitution reaction?

Which of the following is not aromatic heterocyclic?

Which of the following is the correct order for ease of dehydration-

The number of S?S bonds in SO, SO$^{2}_{3}$ SO$^{2}_{6}$ and SO$^{2}_{8}$ respectively are

Find pH of 0.1 M NaOH solution.

Favourable condition for product formation in the given reaction. $SO_{2}\left(g\right)\quad \frac{1}{2}O_{2}\left(g\right)\quad\quad SO_{3}\left(g\right);$ $\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad H=-42\,kj\,is$

[Cr(HO)]Cl (atomic number of Cr = 24) has a magnetic moment of 3.83 BM. The correct distribution of 3d-elections in the chromium present in the complex is

Element A and B have electronegativities 3 and 1.2 respectively? Nature of bond between them?

Cassiterite is ore of :

Grignard reagent can?t be prepared from

Which of the following is invert sugar?

Formula of plaster of paris is :

The common impurity present in bauxite is

Tertiary alkyl halide is practically inert to substitution by $S_N2$ mechanism because of

Snow blindness is caused due to

For a cell reaction involving two electron changes, ${E^{\circ}_{cell} = 0.3 \, V}$ at $ 25^{\circ} C$. The equilibrium constant of the reaction is

For an ideal gas, compressibility factor is

Which of the following reactions is a redox reaction

A certain reaction is non spontaneous at 298K. The entropy change during the reaction is 121 $JK^{-1}.$ Is the reaction is endothermic or exothermic ? The minimum value of $\Delta$H for the reaction is