List of top Chemistry Questions

Total number or voids in $0.5$ mole or compound forming hexagonal closed packed structure are
Crystals can be classified into basic crystal habits equal to
At identical temperature and pressure, the rate of diffusion of hydrogen gas is $3\sqrt{3}$ times that of a hydrocarbon having molecular formula $C_{n}H_{2n-2}$. What is the value of $'n'$ ?
Structural formula of Lewisite is
Water gas is a mixture of
The white $ ZnO $ turns yellow on heating because of
The standard enthalpy of formation of $NH_3$ is $-46.0\, kJ \,mol^{-1}$. If the enthalpy of formation of $H_2$ from its atoms is $-436\, kJ \,mol^{-1}$ and that of $N_2$ is $-712\, kJ\, mol^{-1}$, the average bond enthalpy of $N-H$ bond in $NH_3$ is
The standard emf of a galvanic cell involving $3$ moles of electrons in its redox reaction is $0.59 \,V$. The equilibrium constant for the reaction of the cell is
The product formed as a result of reaction of $ C{{H}_{3}}MgBr $ and $ C{{O}_{2}} $ , on further hydrolysis gives
The phosphate of a metal has the formula $MHPO_4$. The formula of its chloride would be
The heat liberated when $1.89\, g$ of benzoic acid is burnt in a bomb calorimeter at $25 ^{\circ} C$ increases the temperature of $18.94\, kg$ of water by $0.632^{\circ} C$. If the specific heat of water at $25^{\circ} C$ is $0.998\, cal/g$ the value of the heat of combustion of benzoic acid is
The Gibbs' energy for the decomposition of $ {Al2O3 }$ at $500^{\circ} C$ is as follows: $ { \frac{2}{3} Al_2 O_3 -> \frac{4}{3} Al + O_2 ; \Delta_r G = + 960 \, kJ \, mol^{-1} }$ The potential difference needed for the electrolytic reduction of aluminium oxide $ {(Al2O3)}$ at $500^{\circ} C$ is at least
In the following which is soap?
In the following which is not glyceride?
The electronic configuration of actinides cannot be assigned with degree of certainty because of
Which of the following has electrovalent linkage?
The correct order of basic strength of $CH _{3} NH _{2}$ (I), $\left( CH _{3}\right)_{2} NH$ (II), $\left( CH _{3}\right)_{3} N$ (III), $C _{6} H _{5} CH _{2} NH _{2}$ (IV) in gaseous phase is
The correct structure of $ {Fe(CO)_5}$ is (at. no. of $Fe = 26$)
$[Sc(H_2O)_6 ]^{3+}$ ion is
Reaction of solid $KMnO_4$ with conc. $H_2SO_4$ produces manganese heptoxide $(Mn_2O_7)$ in
Pick out the incorrect statement from the following
On monochlorination of $n$-pentane, the number of straight chain isomers formed is
Nuclei of isotopes differ in
Molecules of a noble gas do not possess vibrational energy because a noble gas _________
Methyl acetate will be obtained by reacting $ C{{H}_{3}}OH $ with