List of top Chemistry Questions

The standard reduction potential $E^{o}$ for the half reactions are as: $Z n \rightarrow Z n^{2+}+2 e^{-}, E^{o}=0.76\, V$ $C u \rightarrow C u^{2+}+2 e^{-}, E^{o}=0.34\, V$ The emf for the cell reaction: $Z n+C u^{2+} \rightarrow Z n^{2}+C u$

Arrange the following as increase in oxidation number : (i) $Mn ^{2+}$ (ii) $MnO _{2}$ (iii) $KMnO _{4}$ (iv) $K _{2} MnO _{4}$

The number of lattice arrangements in different crystal systems are:

If $20 \,g$ of a solute was dissolved in $500 \,mL$ of water and osmotic pressure of the solution was found to be $600\, mm$ of $Hg$ at $15^{\circ} C$, then molecular weight of the solute is:

The number of sodium atoms in $2$ moles of sodium ferrocyanide is:

According to Bohr's principle, the relation between principle quantum number $(n)$ and radius of orbit is :

The state of hybridisation of $B$ in $ BC{{l}_{3}} $ is:

Which is more acidic ?

Sucrose, a common sugar, is composed of

What is the pressure of 2 mole of $NH_3$ at 27$^\circ$C when its volume is 5 lit. in van der Waals equation (a = 4.17, b = 0 .03711)

When methyl-t-butyl ether is formed ?

N forms $NCl_3$ whereas P can form both $PCl_3$ and $PCl_5$. Why ?

Which of the following pairs give positive Tollen?s test?

Which of the following pairs give positive Tollen's test?

The methods chiefly used for the extraction of lead and tin from their ores are respectively

The compound having tetrahedral geometry is

Spin only magnetic moment of the compound $Hg[Co(SCN)_4] $ is

Acetaldehyde cannot show

A sodium salt of an unknown anion when treated with $ MgCl_2 $ gives white precipitate only on boiling. The anion is

2-Hexyne gives trans-2-hexene on treatment with

Which of the following has -O-O- linkage?

$(NH_4)_2Cr_2 O_7$ on heating gives a gas which is also given by

Spontaneous adsorption of a gas on solid surface is an exothermic process, because

When $I^-$ is oxidised by $MnO_4^-$ in alkaline medium, $I^-$ converts into

The correct statement(s) for orthoboric acid is/'are