List of top Chemistry Questions

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?

On the basis of the following $E^0 $ values, the strongest oxidising agent is $[Fe(CN)_6]^{4-} \rightarrow [Fe(CN)_6]^{3-}+e^-; $ $\hspace15mm E^0=-0.35 V $ $Fe^{2+} \rightarrow Fe^{3+} + e^-;E^0=-0.77 V $

The rate constants $k_1$ and $k_2$ for two different reactions are $10^{16} .e^{-2000/T}$ and $10^{15} .e^{-1000/T}$,respectively. The temperature at which $k_1= k_2$ is

In which of the following coordination entities the magnitude of $\Delta_0$ (CFSE in octahedral field) will be maximum? (At. no. of Co = 27)

-The stability of carbanions in the following (i) $RC \equiv {C}^{\ominus}$ (iii) $R_2C = {CH}^{\ominus}$ (iv) $R_3C = {CH_2}^{\ominus}$ , is in the order of

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

Bond dissociation enthalpy of ${H_2, Cl_2}$ and $HCl$ are $434, 242$ and ${431 \, kJmol^{- 1}}$ respectively. Enthalpy of formation of $HCl $ is

For the gas phase reaction, ${PCl_{5} (g) <=> PCl_{3} (g) + Cl_{2} (g)}$ which of the following conditions are correct ?

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is

The order of a reaction for an esterification process is

How many electrons are present in 3d orbital of tetrahedral $K_2 [NiCl_4]$ complex?

During a redox titration involving a solution containing $Fe ^{2+}$ ions against $MnO _{4}^{-}$in the presence of excess of $H ^{+}$ions, the number of electrons that gets transferred is.

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

Which one of the following is an amine hormone?

Which equation is true to calculate the energy of activation, if the rate of reaction is doubled by increasing temperature from $ T_1 \, K \, to \, T_2 $ K?

Oxidation of organic compound $'A'$ with $Na_2Cr_2O_7$ and $H_2SO_4$ gives compound $'B'$, which on reduction with $H_2$ in the presence of Ni catalyst gives ethyl alcohol. Give the name of compound $'A'$.

What is the chemical name of the vitamin $B_{12}$ ?

Conversion of chlorobenzene to phenol involves

When chlorine reacts with dil. $NaOH$ under cold conditions, the oxidation state of chlorine changes from zero to

How many stereoisomers does this molecule have? $CH_3CH = CHCH_2CHBrCH_3$

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

A strong base can abstract an $\alpha$-hydrogen from

In a given shell the order of screening effect is

In transforming $0.01$ mole of $PbS$ to $PbSO _{4}$, the volume of ' $10$ volume' $H _{2} O _{2}$ required will be

Anisole is the product obtained from phenol by the reaction known as