List of practice Questions

During the conversion of $NH _{2} OH \rightarrow N _{2} O$, the equivalent weight of $NH _{2} OH$ (mol. wt. of $NH _{2} OH$ is $M$ ) is

Which of the following has smallest number of molecules ?

The molarity of a $NaOH$ solution by dissolving $4 \,g$ of it in $250\, ml$ water is

In the reaction of sodium thiosulphate with $I_2$ in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

In a titration, 25 $cm^3$ of 0.1 N oxalic acid solution requires 20 $cm^3$ of sodium hydroxide for complete neutralization. The mass of sodium hydroxide in 250 $cm^3$ solution is

Dulong and Petit's law (At. mass $\times$ Specific heat = 6.4) is valid only for

S.I. unit of atomic mass and molecular mass is kilograms. Atomic mass is equal to the mass of $6.023 \times 10^{24}$ atoms.

Number of atoms present in $4.25 \,g$ of $NH_3 $ is

If $1 \,mL$ of water contains $20$ drops then number of molecules in a drop of water is

In an experiment, $4 \,g$ of $ M_{2}O_{x} $ oxide was reduced to $2.8 \,g$ of the metal. If the atomic mass of the metal is $ 56\,g\,mol^{-1}, $ the number of $O$ atoms in the oxide is

The total number of atoms of all elements present in $ 1 $ mole of ammonium dichromate is

To dissolve 0.9 g metal, 100 mL of 1 N HCl is used. What is the equivalent weight of metal?

Under the action of a given coulombic force the acceleration of an electron is $2.5 \times 10^{22}\, m \,s^{-2}$. Then the magnitude of the acceleration of a proton under the action of same force is nearly

An electron initially at rest falls a distance of $1.5\, cm$ in a uniform electric field of magnitude $2 \times 10^4\, N/C$. The time taken by the electron to fall this distance is

Charge $Q$ is distributed over a ring, then the force on charge $q$ placed at the centre of the ring will be

The figure shows some of the electric field lines corresponding to an electric field, The figure suggests

The distance between two charges $6\,\mu\,C$ and $15\,\mu\,C$ is $2\,m$. At what point on the line joining the two, the intensity will be zero?

A ball with charge $50 \,e$ is placed at the centre of a hollow spherical shell which has a net charge of $- 50\,e$ . What is the charge on the shells outer surface?

A charged particle is free to move in an electric field. It will travel

An electron moving with the speed $5 \times 10^{6}$ per sec is shooted parallel to the electric field of intensity $1 \times 10^{3} \,N / C$. Field is responsible for the retardation of motion of electron. Now evaluate the distance travelled by the electron before coming to rest for an instant (mass of $e=9 \times 10^{-31} \,kg$, charge $\left.=1.6 \times 10^{-19} \,C \right)$

Let $E_{a}$ be the electric field due to a dipole in its axial plane distant $1$ and let $E _{ q }$ be the field in the equitorial plane distant $1 '$. The relation between $E _{ a }$ and $E _{q}$ is

Two point charges $-q$ and $+q/2$ are situated at the origin and at the point $(a, 0, 0)$ respectively. The point along the $X$-axis where the electric field vanishes is

Two identical conducting balls $A$ and $B$ have positive charges $q_1$ and $q_2$ respectively but $q_1 \ne q_2$ The balls are brought together so that they touch each other and then kept in their original positions. the force between them is

The electric flux for Gaussian surface $A$ that encloses the charged particles in free is (Given $q_1, = - 14 \, n \, C, q_2 = 78.85 \, n \, C, \, q_3 = - 56 \, n \, C) $

Electric field produced by an electron at a point is $E$. What will be electric field produced by $Li^{+++}$ at the same point if it is placed at position of electron ?