Forum

Integers

–16 ÷ [8 ÷ (–2)] is equal to
(a) –1 (b) 1 (c) 4 (d) –4

Electrochemistry – Standard Cell Potential

Define standard electrode potential. Calculate the standard cell potential for the following cell:

Zn∣Zn ^(2+)(1M)∣∣Cu ^(2+)(1M)∣Cu

Given that the standard reduction potentials of Zn and Cu are -0.76 V and +0.34 V, respectively.

Integers

[(– 10) × (+ 9)] + ( – 10) is equal to
(a) 100 (b) –100 (c) – 80 (d) 80

Organic Chemistry – Aldehydes and Ketones

Outline the chemical reactions involved in converting ethanol to ethanoic acid. Explain the mechanism for each step.

AC Circuits – Resonance in an RLC Circuit

Explain the phenomenon of resonance in an RLC circuit. Derive the formula for the resonant frequency and explain how it depends on the circuit components.

Thermodynamics – First Law Application

State the first law of thermodynamics. An ideal gas absorbs 200 J of heat and performs 80 J of work. Calculate the change in internal energy of the gas.

Electric Potential – Point Charge Field

A charge of +2 microCoulombs is placed at the origin. Calculate the electric potential and electric field at a point 0.5 meters away from this charge.

Optics – Young’s Double-Slit Experiment

In Young’s double-slit experiment, the slits are separated by 0.5 mm, and the screen is placed 2 meters away. If the wavelength of light used is 600 nm, calculate the distance between consecutive bright fringes.

Electromagnetic Waves – Maxwell’s Equations

Write Maxwell’s equations and explain how they predict the existence of electromagnetic waves. Describe one real-world application of electromagnetic waves.

Wastewater Story

Think and suggest some ways to minimise waste and pollutants
at their source, taking your home as an example.