A Level H2 Chemistry 2021 Paper 3 Answers Jun 2026

Which of the following types of bonds is responsible for the high melting point of diamond? Answer: B (Covalent network bonds)

Absorption of a photon of light to promote an electron (d-d transition). A Level H2 Chemistry 2021 Paper 3 Answers

Suggest why the lattice energy of MgO is much more exothermic than that of Na₂O. Which of the following types of bonds is

This was the in the 2021 Paper 3. Students were given a starting material: phenol (C₆H₅OH) and asked to synthesize a substituted aromatic compound. This was the in the 2021 Paper 3

Answer: N₂ has a triple bond with a high bond energy ($945 \text kJ mol^-1$) compared to H₂ which has a single bond with lower bond energy ($436 \text kJ mol^-1$). Hence, a large amount of energy is required to break the N≡N bond, making it kinetically inert and less reactive.

Also tell me which exam board/country (e.g., Singapore-Cambridge GCE A-Level H2 Chemistry) you mean—I'll assume Singapore-Cambridge GCE A-Level H2 Chemistry 2021 Paper 3 if you don't specify.