List of top Chemistry Questions

The reagent(s) used for softening the temporary hardness of water is(are)
The ionisation isomer of $[Cr(H_2O )_4Cl(NO_2 )]Cl$ is
Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is
The highest lattice energy corresponds to
The degree of hardness of water is usually expressed in terms of
The most stable complex among the following is
Among the following the third ionization energy is highest for
$AgCl$ is dissolved in excess of each of $NH _{3}, KCN$ and $Na _{2} S _{2} O _{3}$. The complex ions produced in each case are
A solid is formed by two elements $P$ and $Q$. The element $Q$ forms cubic close packing and atoms of $P$ occupy one-third of tetrahedral voids. The formula of the compound is
If the half cell reactions are given as (i) $Fe ^{2+}(a q)+2 e^{-} \rightarrow Fe (s) ;\,\,E^{\circ}=-0.44\, V$ (ii) $2 H ^{+}(a q)+\frac{1}{2} O _{2}(g)+2 e^{-} \rightarrow H _{2} O (l)$ $E^{\circ}=+1.23\, V$ The $E^{\circ}$ for the reaction $Fe (s)+2 H ^{+}+\frac{1}{2} O _{2}(g) \rightarrow Fe ^{2+}(a q)+ H _{2} O (l)$ is
The strongest Lewis acid among boron halides is
The complex showing a spin only magnetic moment of $2.82\, BM$ is
The most adsorbed gas on activated charcoal is
Which of the following have been arranged in decreasing order of oxidation number of sulphur?
Which of the following is a disaccharide?
Which of the following compounds does not leave residue on heating ?
Which of the following compounds dissolve in water?
Platinum, palladium and iridium are called ?noble metals? because
Electrovalent compounds are made up of
By slow distillation of rubber which of the following is obtained?
The letter $'D'$ in $D-glucose$ signifies____
The $ E_{{{M}^{3+}}/M{{n}^{2+}}}^{o} $ values for $ Cr, Mn, Fe $ and $ Co $ are $ -0.41,+1.57,+0.77 $ and $ +1.97\,V $ respectively. For which one of these metals the change in oxidation state from $+ 2$ to $+ 3$ is easiest?
The effective electrophile in aromatic. sulphonation is
Aspirin is
The extent of physisorption of an adsorbate increases with