List of practice Questions

The empirical formula of Calgon is
The pair of elements that form both oxides and nitrides, when burnt in air are
Identify the correct statements about the anomalous behavior of Boron.
In second period, X has second lowest first ionization enthalpy and Y has second highest. Identify X and Y.
The set of molecules in which the central atom is not obeying the octet rule is
The formal charges of atoms (1), (2) and (3) in the ion $\left[ \mathrm{O} = \mathrm{N} = \mathrm{O} \right]^+$ are
From the following plots, find the correct option regarding $T_1, T_2, P_1, P_2$
correct option regarding T1,T2,P1,P2
How many grams of Mg is required to completely reduce 100 mL, 0.1 M $\mathrm{NO}_3^-$ solution using the following reaction? $\mathrm{NO}_3^- + \mathrm{Mg} \to \mathrm{Mg}^{2+} + \mathrm{NH}_3$
What is the oxidation state of S in the sulphur containing product of the following reaction?
$\mathrm{SO}_3^{2-} (aq) + \mathrm{Br}_2(l) + \mathrm{H}_2O \to$
In a photoelectric experiment, light of wavelength 800 nm produces photoelectrons with de Broglie wavelength 1 nm, and 400 nm light gives 0.5 nm. Find work function of the metal.
A hydrogen atom is excited to \( n = 4 \). Find the potential energy of the electron in excited state.
If radius of nucleus with mass number 64 is 4.8 fermi, find mass number of nucleus of radius 6 fermi.
Carrier wave and modulating wave voltages increase by 1% and 3%. Find change in modulation index.
The maximum number of electrons present in an orbital with \(n = 4,\ l = 3\) is
Which of the following elements are arranged in the correct order of their electron gain enthalpies?
Toroid has 4900 turns, \( I = 12\ \text{A} \), average radius = \( 24.5\ \text{cm} \). Find magnetic field inside core.
A steel wire with magnetic moment \( M \) and length \( l \) is bent into semicircle of radius \( R \). Find new magnetic moment.
A magnetic needle points down at \(30^\circ\) to the horizontal. Horizontal component of earth’s magnetic field = 0.3 G. Find the total magnetic field.
A coil (100 turns, radius 3 cm, resistance 4 \(\Omega\)) is co-axial with solenoid (200 turns/cm, diameter 4 cm). Solenoid current drops from 2 A to 0 in 0.04 s. Find induced current.
Light of intensity 12 W/m\(^2\) is incident on 4 cm\(^2\) black surface. Find radiation pressure.
Given: \( E = E_0 \sin(kx - \omega t),\ B = B_0 \sin(kx - \omega t) \). Choose correct relation.
Double convex lens has radii of curvature 4 cm and 8 cm. Refractive index = 1.5. Find focal length.
In YDSE, \( \lambda = 600\ \text{nm} \), fifth fringe at 6 mm. When \( \lambda = 400\ \text{nm} \), third fringe is at:
A charged particle performs SHM in hole through uniformly charged solid sphere. Find frequency.
Assertion (A): In constant potential region, electric field is zero. Reason (R): From Gauss’s Law, zero electric field means zero enclosed charge.