MCQs

The nucleolus is a specialized region within the nucleus dedicated to the transcription of rRNA and the assembly of ribosomal subunits.

Phosphodiester bonds form the sugar-phosphate backbone by connecting the 3' carbon of one ribose to the 5' carbon of the next.

Uracil is a pyrimidine base specific to RNA that pairs with adenine, replacing the thymine found in DNA.

Ribose contains a hydroxyl group (-OH) at the 2' carbon position, distinguishing it from deoxyribose which has a hydrogen atom instead.

Stoichiometric mixture. H₂ produced = 0.3 mol. Volume = 6.72 dm³.

The limiting reactant determines how much of the excess reactant is used.

Carbon is limiting. CH₄ = 1.5 mol. Mass = 24 g.

Stoichiometric mixture. Titanium formed = 1 mol = 48 g.

The limiting reactant determines the maximum product obtainable.

HCl is limiting. CaCl₂ formed = 0.5 mol. Mass = 55.5 g.

N₂ is the limiting reactant and is completely consumed.

SO₂ is limiting. SO₃ formed = 2 mol. Mass = 160 g.

One mole X requires 3 mol Y. Only 2 mol Y are available.

O₂ is limiting. P₂O₅ formed = 0.8 mol.

Stoichiometric mixture. Na₂CO₃ = 1 mol. Mass = 106 g.

O₂ is limiting. CO₂ = 3.2 mol. Volume = 71.68 dm³.

Stoichiometry is based on these fundamental chemical laws.

Potassium is limiting. KOH formed = 1 mol. Mass = 56 g.

Na₂CO₃ is limiting. CO₂ formed = 0.5 mol. Mass = 22 g.