List of top Chemistry Questions

When $AgNO _{3}$ solution is added in excess to $1\, M$ solution of $CoCl _{3} \cdot x NH _{3}$, one mole of $AgCl$ is formed. What is the value of $x$ ?
Buffer capacity of a buffer will be maximum when
Dissociation constant of a weak acid is $10^{-5}$. The pH of 0.1 M solution of this acid is
Which one of the following forms an alcohol with nitrous acid?
Which one of the following forms a green solid with nitrous acid?
Which one of the following has maximum magnetic moment?
Cryoscopic constant is the depression in the freezing point produced by
Cuprammonium ion is having
-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
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.
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
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
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 $
An element with atomic number $21$ is a
Amines behave as
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