Explanation

Each mole of CO₂ contains 2 atoms of oxygen, which is 2 × 16 = 32 g of oxygen.

So, if 32 g of oxygen is in 1 mole of CO₂, then:

16 g of oxygen = 16 / 32 = 0.5 moles of CO₂

Explanation

KCl (potassium chloride) is a salt.

Specifically a neutral salt formed by the reaction of an acid (HCl) with a base (KOH).

Explanation

Urea is a non-electrolyte, meaning it does not dissociate into ions in aqueous solution.

It does not conduct electricity.

Explanation

The appearance of cloudiness in the Lucas test for alcohol is due to the formation of alkyl chlorides. 

Explanation

• Freezing is the process by which a liquid changes to a solid.
• It is the reverse of melting, which is the process by which a solid changes to a liquid.

Explanation

Fats are typically solids at ordinary room temperature (around 20-25°C or 68-77°F).

However, they can melt and become liquids when heated to a higher temperature.

Explanation

The functional group -COOH is the carboxyl group, which is a characteristic functional group of carboxylic acids.

Carboxylic acids are a class of organic compounds that contain this group, examples include:

• Formic acid (HCOOH)
• Acetic acid (CH3COOH)
• Citric acid (C6H8O7)

Explanation

• Filtration
• Sedimentation
• Decantation
• Distillation
• Chromatography

Explanation

Knocking in an engine produces a sharp metallic sound due to premature combustion of the air-fuel mixture, which creates abnormal pressure waves.

Explanation

• Have indefinite shape
• Have indefinite volume
• Can be compressed