Explanation

Histamine is produced in the body primarily through the decarboxylation of the amino acid histidine.

Explanation

Acetyl chloride (CH₃COCl) cannot be prepared directly from acetic acid due to the poor leaving ability of the –OH group.

It requires a chlorinating agent like PCl₅, PCl₃, or SOCl₂ for conversion.

Therefore, it cannot be prepared directly from acetic acid.

Explanation

Homolytic fission results in the formation of alkyl free radicals, where each atom retains one of the bonding electrons.

Explanation

Lithium (Li) forms only a normal oxide, Li₂O, when reacting with oxygen.

Other alkali metals (like Na, K) form peroxides and superoxides.

Explanation

Lattice energy is calculated using the Born-Haber cycle, considering the heat of sublimation, dissociation, ionization, electron affinity, and heat of formation.

After applying the Born-Haber cycle, the lattice energy of KBr is -679.3 kJ/mol.

Explanation

• Phenylamine (also known as aniline) is produced through the reduction of nitrobenzene.
• After the reaction, phenylamine is separated from the reaction mixture using steam distillation.
• This is because phenylamine is volatile and has a relatively low boiling point, which allows it to be distilled off from the reaction mixture using steam.

Explanation

The atomic weight of Mercury (Hg) is 200.59 unified atomic mass units (u), as listed on the periodic table.

Key Information:

• Symbol: Hg (from Latin Hydrargyrum)
• Atomic Number: 80
• Standard Atomic Weight: 200.592 u (often rounded to 200.59 u).

Explanation

Neutron is a neutral particle, meaning it has no electric charge.

Because of this, it didn't respond to electric or magnetic fields, making its detection difficult and late compared to protons and electrons.

Explanation

Calcium Sulphate hemihydrate (CaSO₄·½H₂O) is commonly called Plaster of Paris.

It is used in casts, molds, and construction materials.

Explanation

Ethanol (C₂H₅OH) is oxidized to ethanoic acid (CH₃COOH) using oxidizing agents like acidified potassium dichromate (K₂Cr₂O₇).

This chemical reaction involves the gain of oxygen or loss of hydrogen, which defines oxidation.