Recent questions tagged past papers

$\Delta x$ = (Hydration energy) - (Lattice energy), for a salt $\Delta x$ is found to be $500\;kcal\;mol^{-1}$. Then on increasing the temperature, its solubility in water :

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Chloroethane is treated with alc. KOH. The prooduct formed is :

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Chlorine is passed into dilute cold KOH solution. What are the oxidation number of chlorine in the products formed ?

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Hydrolysis of chloroform with aqueous KOH gives finally :

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The following reaction is known to occur in the body. If $CO_2$ escapes from the system : <br> $CO_2 + H_2O \leftrightharpoons H_2CO_3 \leftrightharpoons H^+ + HCO_3^-$

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The number of $C-C$ sigma bonds present in 1-butyne is :

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Which of the following pairs of ions contain the same number of unpaired electrons ?

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Absolute alcohol is prepared by distillation of rectified spirit in the presence of :

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The half-life of a first order reaction is 10 sec. What is its rate constant (in $sec^{-1}$) ?

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Which of the following set of raw materials are used in the manufacture of $Na_2CO_3$ by Solvay process ?

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At what temperature the density of heavy water will be maximum ?

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The number of acetylene molecules required to form one molecule of form one molecule of benzene is :

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The unit of electrochemical equivalent are :

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Which of the following is an oxide mineral ?

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What is the numerical value of the gas constant $R$ in $J\; mol^{-1}K^{-1} $ ?

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The molecule having zero dipole moment is :

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In Rutherford's $\alpha$-ray scattering experiment, the alpha particles are detected using a screen coated with :

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Which of the following is the anhydride of $HNO_3$ ?

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Inorganic benzene contains :

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A burnning strip of Mg is introduced inti a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is :

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What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide is treated with $H_2O_2$ ?

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Which of the following is the weakest acid in its aqueous solution ?

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Oxalic acid is heated with $conc. H_2SO_4$ when the resultant gases are passed over red hot carbon, $X$ is obtained. $X$ is :

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Aqueous solution of carnallite gives positive test for :

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In which of the following reactions ozone acts as a reducting agent ?

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The industrial preparation of nitric acid by Ostwald's process involves :

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Which of the following is not true ?

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A varying current in a coil changes from 10 A to zero in 0.5 s. If the average emf induced in the coil is 2 volts, the self inductance of the coil is :

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The element that can be used as acceptor impurity to dope silicon is :

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In intrisic semiconductors :

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In a nuclear reactor, material used for control rods is :

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In hydrogen spectrum the shortest wavelength in Balmer series is $\lambda$. The shortest wave length in Bracket series will be :

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In a photoelectric experiment, the maximum velocity of photoelectrons emitted :

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The neutral temperature of a thermocouple with cold junction at $20^{\circ}C$ is $220^{\circ}C$. Its temperature of inversion is :

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When two infinitely long parallel wires separated by a distance of 1 m, each carry a current of 3 A, the force in $N/m$ length experienced by each will be given $\mu_0 = 4 \pi \times 10^{-7}$ SI units :

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In a meter bridge the gaps are closed by resistance 2 and 3 ohm. The value of shunt to be added to 3 ohm resistor to shift the balancing point by 22.5 cm is :

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A parallel plate capacitor filled with a dielectric of relative permitivity 5 between its plates is charged to acquire an energy $E$ and isolated. If the dielectric is replaced by another of relative permitivity 2, its energy becomes:

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The electric field intensity in air at a point $20\; cm$ from a point charge $Q$ coulombs is $4.5 \times 10^5\;N/C$. The magnitude of $Q$ is :

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Two charges $8C$ and $-6C$ are placed at a distance of separation $d$ between them and exerts a force of magnitude $F$ on each other. If a charge $8C$ is added to each of these and they are brought nearer to by a distance $d/3$, the magnitude of force between them will be :

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A magnetic needle is placed with its north pole facing north in north south direction. In its map of magnetic field the null point will be :

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The magnetic field strength at a point at a distance $d$ from the centre, on the axial line of a very short bar magnet of magnetic moment $M$, is $B$. The magnetic induction at a distance $2d$ from centre, on equatorial line of magnet of magnetic moment $8M$, will be :

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The temperature at which a ferromagnetic material becomes paramagnetic is called :

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In a spectrometer experiment three prisms $A,\;B$ and $C$ with same angle of prism but of different materials of refractive indices $\mu_A = 1.33, \; \mu_B = 1.55, \; \mu_C = 1.44$ are used. The corresponding angles of minimum deviation $D_A,\;D_B,\;D_C$ measured will be such that :

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In a Huygen's eye piece, with an eye piece of focal length F, the distance between the eye piece and field lens should be :

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The least distance of distinct vision is 25 cm. If the focal length of convex lens is 10 cm, it acts as a simple microscope of maximum magnification :

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The final image in an astronomical telescope is :

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A car with a horn of frequency $620\;Hz$, travels towards a large wall with a speed $20\;m/s$. If velocity of sound is $330\;m/s$ the frequency of echo of sound of horn as heard by driver :

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A glass tube $1.5\;m$ long and open at both ends is immersed vertically in a mind tank completely. A tuning fork of $600\;Hz$ is vibrated and kept at the upper end of tube and tube in gradually raised out of water. The total number of resonances heard before when the tube comes out of water, taking $v = 330\;m/s$ :

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In a medium, in which a transverse progressive wave is travelling to the phase difference between two points with a distance of separation is $1.25\;cm$ is $\frac{\pi}{4}$. If the frequency of wave is $1000\;Hz$, its velocity will be :

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The relation between melting point of ice and pressure is shown by ice line, which will be :

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