Explanation

Ammonia (NH₃) has a higher boiling point than phosphine (PH₃)

Ammonia exhibits hydrogen bonding, a stronger intermolecular force than the dipole-dipole forces in phosphine.

Explanation

Be(OH)₂ is an amphoteric hydroxide, meaning it can act as both an acid and a base.

Mg(OH)₂ and Ca(OH)₂ are basic hydroxides.

Explanation

A liquid crystal is a state of matter that exhibits properties of both liquids and crystals.

It requires the molecules to have a specific structure, often long and rigid, to form ordered phases.

While soap can form structures similar to liquid crystals when mixed with water (forming micelles), pure soap is not a liquid crystal.

The other options listed, DNA, cholesteryl format, and engine oil, can all exhibit liquid crystal properties under certain conditions. 

Explanation

Tin has the lowest melting point (~232°C) among.

• Zinc (~419°C)
• Gold (~1064°C)
• Lead (~327°C)

Explanation

 The bond between a fatty acid and glycerol is called an ester bond.

This bond forms when the hydroxyl group (-OH) of glycerol combines with the carboxyl group (-COOH) of the fatty acid, releasing a molecule of water (H2O) in a process called dehydration synthesis.

Explanation

Chloroform is classified as a possible human carcinogen, particularly linked to liver and kidney cancer with prolonged exposure.

It affects the liver by causing cellular damage.

It has been shown to induce tumors in animal studies.

Explanation

Phenolphthalein is colorless in acidic and neutral solutions but turns pink in an alkaline medium.

This happens because, in a basic solution, phenolphthalein loses H⁺ ions, forming its negatively charged phenolate ion, which gives the pink color.

Explanation

Explanation

Explanation