Pakistan MCQs

Hydrolysis breaks susceptible bonds using water components.
Esters, amides, and biological polymers can undergo hydrolysis.

Number of particles = moles × Avogadro constant.
0.25 × 6.02×10²³ = 1.5e+23.

Polymers contain repeated structural units.
They may form by addition or condensation processes.

Number of particles = moles × Avogadro constant.
0.5 × 6.02×10²³ = 3.01e+23.

Addition polymerization opens double bonds without small-molecule byproducts.
Polyethene forms from ethene.

Number of particles = moles × Avogadro constant.
1.5 × 6.02×10²³ = 9.03e+23.

Condensation polymerization joins bifunctional monomers.
Water or another small molecule is often released.

Number of particles = moles × Avogadro constant.
2 × 6.02×10²³ = 1.2e+24.

The molecule has two carbons and an alcohol group.
The correct name is ethanol.

Number of particles = moles × Avogadro constant.
3 × 6.02×10²³ = 1.81e+24.

The molecule has a two-carbon carboxylic acid chain.
Its IUPAC name is ethanoic acid.

Maternal antibodies and antibody injections provide passive immunity.
Protection is immediate but usually short-lived.