List of practice Questions

In the given network, the value of $C$, so that an equivalent capacitance between $A$ and $B$ is $3\mu F$, is
Charges $5 \mu C$ and $10 \mu C$ are placed 1 m apart. Work done to bring these charges at a distance 0.5 m from each other is $(k = 9\times 10^9 SI)$
A hollow metal sphere of radius 10 cm is charged such that the potential on its surface becomes 80 V. The potential at the centre of the sphere is
A $600 \,pF$ capacitor is charged by $200 \,V$ supply. It is then disconnected from the supply and is connected to another $300 \,pF$ capacitor. The electrostatic energy lost in the process is
How many $ 1\,\mu F $ capacitors must be connected in parallel to store a charge of $1\, C$ with a potential of $110\, V$ across the capacitors?
Most stable carbocation is
In Kjeldahl's method, the nitrogen present is estimated as
Most stable carbocation is
: Methyl cyanide has higher boiling point than methyl isocyanide. : Dipole moment of methyl cyanide is higher than that of methyl isocyanide.
Which one of the following is not made of soft iron?
A bar magnet of magnetic moment $10^{4}\, J / T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $4 \times 10^{-5}\, T$ to a direction of $60^{\circ}$ from the field will be
Magnetic force between two short magnets, when they are co-axial follows inverse square law of distance. The magnetic forces between two poles do not follow inverse square law of distance.
Which of the following substances magnetic susceptibility $\chi_{m}$ is negative?
Solubility product of ${PbCl_2}$ at ${298\, K}$ is ${1 \times 10^{-6}}$. At this temperature, solubility of ${PbCl_2\, (in\, mol/L)}$ is
If the salts $ M_2X $ , $ QY_2 $ and $ PZ_3 $ have the same solubilities, their $ K_{sp} $ values are related as
Le-Chatelier?s principle is not applicable to
Given a gas phase reaction, $\hspace10mm 2A(g)+B(g) \rightleftharpoons C(g)+D(g)$ Which one of the following changes will affect the value of $K_c$?
The equilibrium constant for mutarotation $\alpha-D \rightleftharpoons \beta-D$ Glucose is $1.8$. What percentage of $\alpha$ form remains at equilibrium?
An acid HA ionises as $HA {\rightleftharpoons} H^{+} + A^{-}$ The pH of 1.0 M solution is 5. Its dissociation constant would be:
A vessel at 1000 K contains $CO_2$ with a pressure of 0.5 atm. Some of the $CO_2$ is converted into CO on the addition of graphite. It the total pressure at equilibrium is 0.8 atm, the value of K is
$K_{sp}$ of $CaSO_4\cdot5H_2O$ is 9 x $10^{-6}$, find the volume for 1 g of $CaSO_4$ (M.wt. = 136).
What is the $pH$ of a $0.5\, M$ aqueous solution of $NH_4Cl$ with $0.2\, M \,NH_3$? $ (pK_a = 9.25)$
A water fountain on the ground sprinkles water all around it. If the speed of water coming out of the fountain is $v$, the total area around the fountain that gets wet is
A particle of mass $m$ is projected with a velocity $\upsilon$ making an angle of 30$^{\circ}$ with the horizontal. The magnitude of angular momentum of the projectile about the point of projection when the particle is at its maximum height $h$ is :
A ball rolls of the top of a stair way with a horizontal velocity $ u\,m{{s}^{-1}}. $ If the steps are $ h $ metre high and b metre wide, the ball will hit the edge of the nth step, where $ n $ is