List of top Chemistry Questions

Percentage covalent character is maximum in :
Peptisation denotes
$PCl_5$ is possible but $NCl_5$ does not exist :
Pb and Sn are extracted from their chief ores by
Pd has exceptional configuration 4d$^{10}$ 5s$^\circ$. It belongs to
P-V diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be (where $R$ is universal gas constant)
$P$ is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness $dr$, at a distance $r$ from the nucleus. The volume of this shell is $4\pi r^2dr$. The qualitative sketch of the dependence of $P$ on $r$ is
$P_4O_6$ is chemically related to which acid ?
P.V.C. as obtained after polymerisation is
Ozone turns Benzidine paper
Ozonised oxygen can be obtained from $H_2O$ by the action of
$P_2O_5$ reacts with $H_2SO_4$ to give $SO_3\, and \, HPO_3$.Which property of $P_2O_5$ is depicted in this reaction ?
$P_4 + NaOH + H_2O \rightarrow NaH_2PO_3 + PH_3$ is
Ozone hole refers to
Oxygen boils at $-183^{\circ} C$.This temperature is approximately
Oxygen has an oxidation state of +2 in the compound :
Oxygen is more electronegative than sulphur, yet $H_2S$ is acidic while $H_2O$ is neutral. This is because
Oxygen molecule exhibits
Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: $ {\frac{1}{2} Cl_{2} (g) ->[\frac{1}{2} \Delta_{diss} H^{\ominus}] Cl(g) ->[\Delta_{eg} H^{\ominus}] Cl^{-} (g) ->[\Delta_{Hyd} H^{\ominus}] Cl^{-} (aq)}$ using the data, $ {\Delta_{diss} H^{\ominus}_{Cl_2} = 240 \, kJ \, mol^{-1}}$, $ {\Delta_{eg} H^{\ominus}_{Cl} = - 349 \, kJ \, mol^{-1}}$, $ {\Delta_{hyd} H^{\ominus}_{Cl^{-}} = - 381 \, kJ \, mol^{-1}}$ , well be
Oxone is
Oxides of sulphur and nitrogen are important pollutants of
Oxidation state of oxygen in $H_2O_2$ is
Oxidation state of $S$ in $H_2S_2O_8$ is
Oxidation number of silver in silver amalgam is
Oxidation number of sulphur in Caro?? acid is