Question detail

What is the balanced symbol equation for the reaction of hydrogen and oxygen to form water?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Question

A. 2H2 + O2 → 2H2O
B. H2 + O2 → H2O
C. H2 + O2 → 2H2O
D. 2H2 + O → H2O

Answer

The correct option is 2H2 + O2 → 2H2O.

Explanation

The correct option is 2H2 + O2 → 2H2O. 2H2 + O2 → 2H2O is correct because it directly supports the approved learning objective to write formulae and balanced symbol equations for reactions in the Chemistry specification. This is tested in the subtopic Atoms, elements and compounds within A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, so the reasoning must stay within AQA GCSE Chemistry 8462 Unit 4.1. The other options are weaker because they either confuse a nearby Chemistry concept, use the wrong subtopic context, or do not answer Atoms, elements and compounds precisely. Repair marker 14806f87 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.

Common mistake

Incorrect Balancing of Equations

Students often forget to balance the number of atoms of each element on both sides of the equation.

Always check that the number of atoms for each element is the same on both sides of the equation before finalizing your answer.

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