Explanation

Aluminium burns in oxygen with a brilliant white flame, producing aluminium oxide (Al₂O₃).

This reaction is highly exothermic.

It is often seen in thermite reactions and metal combustion demonstrations.

Explanation

Ethylene oxide is used to produce glycols and other intermediates, which are ingredients in lipsticks for smooth texture and consistency.

It contributes to the emulsifying agents and solvents used in cosmetic formulations like lipstick for better blend and stability.

Explanation

At extremely low temperatures, helium-4 becomes a superfluid, a state with zero viscosity.

In this state, it can flow without friction, even climbing walls of containers — a quantum phenomenon.

Explanation

Water vapor is directly related to humidity, which plays a crucial role in weather prediction. 

The amount of water vapor in the air significantly influences cloud formation, precipitation, and temperature. 

Therefore, measuring water vapor content is essential for weather forecasting. 

Explanation

Sodium chloride (NaCl) dissolves in water because it is an ionic compound that dissociates into ions.

Water molecules surround and separate the sodium and chloride ions, allowing it to dissolve.

Explanation

Washing soda, also known as sodium carbonate (Na₂CO₃).

It is made up of sodium (Na), carbon (C), and oxygen (O).

It is commonly used for cleaning purposes due to its ability to soften water and remove stains.

Explanation

Explanation

Silver: Highest electrical conductivity, rated 100 on a scale of 0 to 100.

Copper: Second highest conductivity, rated 97.

Gold: Good conductor with a rating of 76.

Aluminum: Conductivity rating of 60.

Explanation

In the complex  [ 𝐹 𝑒 ( 𝑁 𝐻 3 ) 6 ] ^2 + , iron (Fe) is in the +2 oxidation state, meaning it has a  𝑑6 electron configuration.

Ammonia (NH₃) is considered a strong field ligand under Crystal Field Theory (CFT), causing the electrons in the 𝑑-orbitals to pair up due to the large splitting of the 

𝑑-orbitals.

In a strong field environment, the electrons occupy the lower energy  𝑡2𝑔 orbitals first, and all six electrons pair up, leaving no unpaired electrons.

Therefore, the number of unpaired electrons is 0.

Explanation

• The process of separating solute and solvent from a mixture is generally referred to as Filtration.
• Filtration is used to separate an insoluble solid (solute) from a liquid (solvent) by passing the mixture through a filter.