List of practice Questions

The bond dissociation energies of gaseous H₂, Cl₂, and HCl are 104, 58, and 103 kcal, respectively. The enthalpy of formation of HCl gas would be:

Let $ \lambda_e $, $ \lambda_p $, and $ \lambda_d $ be the wavelengths associated with an electron, a proton, and a deuteron, all moving with the same speed. Then the correct relation between them is:

In a Bowler's solution containing the same concentrations of B^- and HB, the ratio of K_B to B^- is 10^-10. The pH of the Bowler's solution will be:

Assertion (A): The potential energy of an electron revolving in any stationary orbit in a hydrogen atom is positive.
Reason (R): The total energy of a charged particle is always positive.

A projectile of mass 200 g is launched in a viscous medium at an angle $60^\circ$ with the horizontal, with an initial velocity of 270 m/s. It experiences a viscous drag force $\vec{F} = -c \vec{v}$ where the drag coefficient $c = 0.1 \, \text{kg/s}$ and $\vec{v}$ is the instantaneous velocity of the projectile. The projectile hits a vertical wall after 2 s. Taking $e = 2.7$, the horizontal distance of the wall from the point of projection (in m) is ____

Benzene on ozonolysis followed by reaction with Zn + H₂O gives:

Assertion (A): We cannot form a p-n junction diode by taking a slab of a p-type semiconductor and physically joining it to another slab of an n-type semiconductor.
Reason (R): In a p-type semiconductor, $ n_e \gg n_h $ while in an n-type semiconductor $ n_h \gg n_e $.

Assertion (A): The deflection in a galvanometer is directly proportional to the current passing through it.
Reason (R): The coil of a galvanometer is suspended in a uniform radial magnetic field.

What is the enthalpy of neutralization for CH₃COOH + NaOH?

Assertion (A): It is difficult to move a magnet into a coil of large number of turns when the circuit of the coil is closed.
Reason (R): The direction of induced current in a coil with its circuit closed, due to motion of a magnet, is such that it opposes the cause.

Show that $ \mathbf{E} = \rho \mathbf{J} $ leads to Ohm's law. Write a condition in which Ohm's law is not valid for a material.

What does sodium phthalate give on reaction with sodalime?

In a diffraction experiment, the slit is illuminated by light of wavelength 600 nm. The first minimum of the pattern falls at $ \theta = 30^\circ $. Calculate the width of the slit.

In a Young's double-slit experiment, two light waves, each of intensity $ I_0 $, interfere at a point, having a path difference $ \frac{\lambda}{2} $ on the screen. Find the intensity at this point.

A spherical convex surface of radius of curvature $ R $ separates glass (refractive index $ 1.5 $) from air. Light from a point source placed in air at a distance $ \frac{R}{2} $ from the surface falls on it. Find the position and nature of the image formed.

The energy of an electron in an orbit of Bohr hydrogen atom is $ -3.4 \, \text{eV} $. Find its angular momentum.

What is used for the Thermite Reaction?

What is the correct sequence at the time of death of a partner?
(A) Amount paid to Executor
(B) Preparation of Revaluation account
(C) Calculation of Amount Payable to executor of Deceased partner
(D) Calculation of Revaluation Gain/Loss
(E) Balance of Executor's loan A/c
Choose the correct answer from the options given below:

What color does Silver Chloride (AgCl) turn upon exposure to sunlight?

Which of the following is not a Bronsted acid?

A p-type Si semiconductor is made by doping an average of one dopant atom per $ 5 \times 10^7 $ silicon atoms. If the number density of silicon atoms in the specimen is $ 5 \times 10^{28} \, \text{atoms/m}^3 $, find the number of holes created per cubic centimetre in the specimen due to doping. Also, give one example of such dopants.