List of practice Questions

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 relation between an ac voltage source and time in $SI$ units is $V= 120\, sin(100 \,\pi t)cos(100\,\pi t) V$. The value of peak voltage and frequency will be respectively

The relation between phase difference and path difference 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 infoldings in mitochondria are known as:

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

The gaseous hormone which induces the ripening of fruits is

The gastric juice contains:

The essential distinction between X-rays and $ \gamma - $ rays is that

The example of pivot joint is

The equation $y = 4cos(2\pi x)cos(2\pi t)$ represents

In the following which is not glyceride?

In the following which is soap?

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 $Fe = 26$)

Single step large mutation leading to speciation is also called

Single step large mutation leading to speciation is also called:

Select the incorrect statement.

$[Sc(H_2O)_6 ]^{3+}$ ion is

Sago is obtained from