List of top Chemistry Questions

Oxidation state of Cl in $CaOCl_2$ is/are

Oxidation number of iodine in $IO_3^-$, $IO_4^-$, $KI$ and $I_2$ respectively is

Oxidation number of iodine varies from

Oxidation number of Os in $ {OsO_4}$ :

Out of the four liquids given below, the one having lowest vapour pressure at 25$^\circ$C is

Oxidation number of $Cl$ in $NOClO_4$ is

Out of $ {H2S2O3, H2S2O4, H2SO5}$ and $ {H2S2O8}$ peroxy acids are

Out of benzene and phenol, phenol is more easily nitrated because

Out of $CHCl_3$, $CH_4$ and $SF_4$ the molecules having regular geometry are

Osmotic pressure of urea solution at 10$^\circ$C is 500 mm. Osmotic pressure of the solution becomes 1053 mm when it is diluted and the temperature israised to 25 $^\circ$C. The extent of dilution is

Orthoboric acid -

Orthoboric acid when heated to red hot gives

Ortho and para hydrogen differ

Organomercury compounds are

Ordinary glass is :

Ordinary water is not used as a moderator in nuclear reactors because

Oppaneuer oxidation is the reverse process of

Order of size of $sp, sp^2$ and $sp^3$ orbitals is

One of the following is a Bronsted acid but not a Bronsted base

One of the acid listed below is formed from $P_2O_3$ and the rest are formed from $P_2O_5$. The acidformed from phosphorus (III) oxide is

One of the following cannot be prepared by Kolbe's electrolytic process ?

One mole of magnesium in the vapour state absorbed 1200 kJ of energy. If the first and second ionization energies of magnesium are 750 and 1450 $kJ mol^{-1}$ respectively, the final composition of the mixture is

One mole of a perfect gas expands isothermally to tentimes its original volume. The change in entropy is

One mole of an ideal gas undergoes a cyclic process $ ABCDA $ as shown in the $ P-V $ diagram, Tire net work done in the process is $ (1\, atm = 10^6 $ dyne $ cm^{-2} $ )

One mole of $1$,$2$-dibromopropane on treatment with $X$ moles of $NaNH_2$ followed by treatment with ethyl bromide gave a $2$-pentyne. The value of $X$ is