Explanation

BF₃ (Boron trifluoride) is an electron-deficient molecule because boron has only 6 valence electrons after bonding, which is less than the stable octet.

It tends to accept a lone pair from other atoms to complete its octet, making it a Lewis acid.

Explanation

Chlorine is a strong oxidant that rapidly kills many harmful microorganisms.

Chlorine is a toxic gas.

Explanation

Methane (CH₄) is produced during the anaerobic fermentation of biomass.

It is the main component of biogas.

It is widely used as a renewable energy source.

Explanation

In a double displacement reaction, two compounds exchange ions to form two new compounds.

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) involves the exchange of ions to form sodium chloride (NaCl) and water (H₂O), making it a double displacement reaction.

Explanation

When hydrogen sulfide (H2S) reacts with sulfur dioxide (SO2), the reaction produces sulfur (S) and water (H2O).

2H2​S+SO2​→3S+2H2​O

• Reactants: Hydrogen sulfide (H₂S) and Sulfur dioxide (SO₂)

• Products: Elemental Sulfur (S) and Water (H₂O)

  
  

Explanation

Mercury is the only metal that is liquid at room temperature, unlike the others (Copper, Brass, Aluminum, Silver, Titanium, Platinum) which are solid.

It remains in liquid form due to its low melting point of about -38.83°C.

Explanation

Gases fill all the space available to them by expanding to take the shape and volume of their container.

Unlike solids and liquids, gases have no fixed shape or volume.

Explanation

Copper is a non-magnetic material, meaning it does not exhibit magnetic properties.

Cobalt, Iron, and Nickel are magnetic materials, as they can be magnetized and attract magnets.

Explanation

Phosphorous, especially red phosphorous, is used in the preparation of matchsticks because it ignites easily due to its rapid burning property.

It helps in the quick ignition of the match when struck.

Explanation

A concentrated solution has a large amount of solute dissolved in a given quantity of solvent.

It is the opposite of a dilute solution, which contains a small amount of solute.