List of top Chemistry Questions

What is the $ [OH^-] $ in the final solution prepared by mixing $20.0\, mL$ of $0.050\, M\, HCl$ with $30.0\, mL$ of $0.10\, M Ba(OH)_2 $ ?

The equivalent conductance of $\frac{ M }{32}$ solution of a weak monobasic acid is $8.0\, mho\, cm ^{2}$ and at infinite dilution is $400\, mho\, cm ^{2}$, The dissociation constant of this acid is -

The oxidation state of $Fe$ in the brown ring complex : $[Fe(H_2O)_5 NO]SO_4$ is

The incorrect statement in respect of Chromyl chloride test is

The reaction involved in the oil of winter green test is salicylic acid ${->[{\Delta}][{\text { Conc. } H _{2} SO _{4}}]}$ product. The product is treated with $Na _{2} CO _{3}$ solution. The missing reagent in the above reaction is

The carbon-carbon bond length in Benzene is

$ {CH_3COOH ->[LiA/H_4] X ->[Cu][300 ^{\circ}C] Y ->[dilute][NaOH] Z}$ In the above reaction $Z$ is

A compound of $'A'$ and $'B'$ crystallises in a cubic lattice in which the $'A'$ atoms occupy the lattice points at the corners of the cube. The $'B'$ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is

A 6% solution of urea is isotonic with

In the electrolysis of acidulated water, it is desired to obtain $1.12\, cc$ of Hydrogen per second under $S.T.P.$ condition. The current to be passed is

$10^{-6}\, M\, NaOH$ is diluted $100$ times. The $pH$ of the diluted base is

For a first order reaction, the time required for $99.9\%$ of the reaction to take place is nearly

In which of the following molecules / ions $BF _{3},\,NO _{2}^{-}, NH _{2}^{-}$ and $H _{2} O$, the central atom is $sp ^{2}$ hybridized ?

What is the dominant intermolecular force on bond that must be overcome in converting liquid $CH_3 OH$ to a gas?

A bivalent metal has an equivalent mass of $32$. The molecular mass of the metal nitrate is

How many ' $mL$' of perhydrol is required to produce sufficient oxygen which can be used to completely convert $2 \,L$ of $SO _{2}$ gas to $SO _{3}$ gas?

For the following cell reaction $Ag \left| Ag ^{+}\right| AgCl \left| Cl ^{\ominus}\right| Cl _{2}, Pt$ $\Delta G ^{\circ} f ( AgCl )=-109\, kJ / mol$ $\Delta G ^{\circ} f \left( Cl ^{-}\right)=-129\, kJ / mol$ $\Delta G ^{\circ} f \left( Ag ^{+}\right) 78 \,kJ / mol$ $E ^{\circ}$ of the cell is

Among the following, the compound that contains ionic, covalent and coordinate linkage is

The enthalpy of formation of $NH_3$ is $- 4 6\, kJ \, mol^{-1}$. The enthalpy change for the reaction : $2 NH _{3}(g) \longrightarrow N _{2}(g)+3 H _{2}(g)$ is

The r.m.s. velocity of molecules of a gas of density $4 \,kg \,m^{-3}$ and pressure $1.2 \times10^{5} Nm^{-2}$ is

$1$ mole of photon, each of frequency $2500\,s^{-1},$ would have approximately a total energy of :

Which one of the following is called a carbylamine?

The volume of $ 2 \,N\, H_2SO_4 $ solution is $ 0.1 \,dm^3 $ . The volume of its decinormal solution (in $ dm^3 $ ) will be

In the following reaction sequence, Ethyl amine $ \ce{->[HNO_2]} A \ce{->[PCl_5]}B \ce{->[NH_3]} C $ the compound $ 'C' $ is