IGCSE Chemistry (0620) — May–June 2025, Paper 42
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Using numbers only, state the percentage of nitrogen in clean, dry air.
Answer this question and get it marked →This question is about covalent compounds. State what is meant by a covalent bond.
Answer this question and get it marked →This question is about electrolysis. Complete the definition of electrolysis by filling in the missing words. "The decomposition of ........................................…
Answer this question and get it marked →Chromium is the element with atomic number 24 in the Periodic Table. The main ore of chromium is chromite. Chromite contains FeCr2O4. FeCr2O4 reacts with carbon. Complete the…
Answer this question and get it marked →Alkali metals are reactive elements. State the group number of the alkali metals.
Answer this question and get it marked →Ethene, C2H4, is the first member of a family of similar compounds which contains the alkene functional group. State the term for a family of similar compounds which contain the…
Answer this question and get it marked →