List of top Chemistry Questions

Consider the following sequence of conversion. $\underbrace{2NO +O_2}_{(X)}$ $ {<=>}$ $\underset{\text{(Y)}}{ {2NO2}}$ $ {<=>[\text{Cool}][\text{heat}]}$ $\underset{\text{(Z)}}{ {N2O4}}$ $X$, $Y$ and $Z$ can be described as

Consider the following reaction $ {C_6H_5NO_2 ->[Sn/HCl] X ->[C_6H_5COCl] Y + HCl}$ What is Y ?

Consider the dipole moments of $NH_3$ and $NF_3$.Which of the following is correct ?

Consider a titration of $ {K_2Cr_2O_7}$ solution with acidified Mohr?? salt solution using diphenylamine as indicator. The number of moles of Mohr?? salt required per mole of dichromate is

Conjugate base of $H_2$ is

Conductivity (unit Siemen's S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then the unit of the constant of proportionality is

Conductivity of 0.01 M NaCl solution is $0.00147ohm^{-1} cm^{-1}$. What happens to this conductivity if extra 100 mL of $H_2O$ will be added to the above solution ?

Compound $C_2H_6O$ has two isomers $X$ and $Y$. On reaction with $HI$, $X$ gives alkyl iodide and water while $Y$ gives alkyl iodide and alcohol. Compounds $X$ and $Y$ are respectively

Composition of mischmetal is

Complete the following reactions by filling the appropriate choice. (A) $6XeF_4 + 12H_2O \to 4Xe + 2XeO_3 +$ + (B) $XeF_6 + 3H_2O \to$ $+6HF$

Complete the given equations : (i) $Cu + 8HNO_3 \to 3Cu(NO_3)_2 +$ $+ 4H_2O$ (ii) $4Zn +10HNO_3 \to 4Zn(NO_3)_2 + 5H_2O+$ (iii) $I_2 + 10HNO_3 \to$ $+ 10NO_2 + 4H_2O$

Compare the energies of two radiations $E_1$ with wavelength $800\,nm$ and $E_2$ with wavelength $400\,nm$.

Common oxidation state of scandium, a transition is/are [Ar. No. of Sc = 21]

Colour in transition metal compounds is attributed to

Colloidal particles exhibit Tyndall effect due to

Colloidal solution can be purified by

Colloidal solutions are not purified by

Colloidal sulphur is obtained when

Colloidal gold is prepared by

Colloid of which one of the following can be prepared by electrical dispersion as well as reduction method ?

Collin's reagent can cause the conversion of

Coinage metals show the properties of

Coefficients x, y and z in the following balanced equation $ {xMnO^{-}_4 + y H_2S + z H^{+} -> S + Mn^{2+} + H_2O}$ are respectively

$[CoF_{6}]^{3-}$ is

Cod Liver oil is