Explanation

• Uranium deposits are found in Dera Ghazi Khan of Punjab.
• The uranium mill was also established in Pakistan in 1977-78.

Additional information:

• Kazakhstan is the biggest producer of Uranium in the world.
  
  
  Last verified on 22-10-2026

Explanation

• The atomic number of hydrogen is 1.
• It is the first element on the periodic table. 
• Named by: Antoine Lavoisier (1783)
• Atomic mass: 1.00784 u
• Appearance: Colorless gas
• Symbol: H
• Protons: 1
• Electrons: 1

Last updated 26-07-2026 by NA

Explanation

• The primary component of natural gas is methane (CH4).
• Making up 70% to 90% or more of its composition.
• It is a colorless, odorless, and highly flammable hydrocarbon gas.
• Characteristics: It is a fossil fuel, often found in rock formations alongside oil or on its own. 

Last updated question 15 March2026

Explanation

• Mercury Symbol: Hg
• Atomic number: 80
• Melting point: -38.83 °C
• Atomic mass: 200.59 u

Last verified on 13-03-2026

Explanation

• Gas molecules move freely in all directions because the particles are far apart.
• Gas particles have weak intermolecular forces and high kinetic energy.

Additional information:

• Solids: Vibrate in fixed positions
• Liquids: Move/slide around each other

Last verified on 06-10-2026

Explanation

• Nitrous oxide, commonly known as laughing gas.
• It is a colorless, non-flammable gas used in medicine.
• Nitrous oxide (N₂O) causes temporary laughing and relaxation.

Additional information:

• Nitrous oxide was discovered by Joseph Priestley in 1772.

Last verified on 18-01-2026

Explanation

• Hydrogen and helium are the two lightest gases.
• Helium is the second most abundant element in the universe, after hydrogen.
• Helium has monatomic molecules.
• It is the lightest of all gases except hydrogen.
• Hydrogen is the lightest gas known.
• It provides the maximum lift for balloons due to its very low density.

Last updated question 17-02-2026

Explanation

• Carbon dioxide (CO₂) is used in fire extinguishers.
• It extinguishes fire by displacing oxygen and cooling the burning material.
• CO₂ fire extinguishers are especially effective for electrical and flammable liquid fires.
• Carbon dioxide is a colorless and non-flammable gas.
• It leaves no residue after use.

Explanation

• The main reaction occurring in the Sun's core is nuclear fusion.
• In fusion, hydrogen nuclei combine to form helium, releasing a huge amount of energy.
• This energy is responsible for the Sun's light and heat.
• The Sun's primary fusion process is the proton–proton chain reaction.

Last verified on 01-09-2026

Explanation

• Freezing Point: 0°C
• Fahrenheit: 32°F
• Kelvin: 273.15 K

Additional information:

• Boiling Point: 100°C (212°F or 373.15 K)
• Standard Atmospheric Pressure: 1 atm (760 mmHg)

Last verified on 06-07-2026