List of top Chemistry Questions

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

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?

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

Number of moles of $MnO^{-}_4$ required to oxidise one mole of ferrous oxalate completely in acidic medium will be

The degree of dissociation of $XY$ in case of following reaction is found to be $ 0.4 $ from vapour density measurement. If the observed vapour density of $X Y$ be $100$ then its molecular weight is $ XY\to X+Y $

Amines behave as

An element with atomic number $21$ is a

The angular shape of ozone molecule $ (O_3 )$ consists of

In the reaction; $Fe ( OH )_{3( s )} \rightleftharpoons Fe ^{3+}{ }_{( aq )}+3 OH _{\text {(aq) }}^{-}$, if the concentration of $OH ^{-}$ ions is decreased by $\frac{1}{4}$ times, then the equilibrium concentration of $Fe ^{3+}$ will increase by,

The value of equilibrium constant of the reaction, $ HI(g) \rightleftharpoons \frac{1}{2} H_2 (g) + \frac{1}{2} I_2 (g)\, \, is\, \, 8.0 $ . The equilibrium constant of the reaction, $ H_2 (g) + I_2 (g) \rightleftharpoons 2HI(g) $ Will be

For the reaction $Fe_2O_3 +3CO \rightarrow 2Fe + 3CO_2$ the volume of carbon monoxide required to reduce one mole of ferric oxide is

The increasing order of the rate of HCN addition to compounds A-D is : (A) HCHO $(B)CH_{3} COCH_{3}$ $\left(C\right)phCOCH_{3}$ $\left(D\right)phcoph$

A gas deviates from ideal behaviour at a high pressure because its molecules

The monomers of buna-$S$ rubber are

Mesomeric effect involves delocalisation of

The calculated bond order of superoxide ion $(O_2^- )$ is

Which of the following electrolytic solutions has the least specific conductance ?

Which of the following is considered as an anticancer species?

Volume occupied by one molecule of water $(density\, = 1 g\, cm^{-3} )$ is