AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
A skeletal chemical equation is an unbalanced chemical equation in which the number of atoms of each element is not equal on both sides of the arrow.
Example: $\text{Mg} + \text{O}_2 \rightarrow \text{MgO}$ is a skeletal chemical equation.
Source: Chapter 1, Section 1.1.1 Writing a Chemical Equation
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The examiner expects the definition along with the key idea that it is unbalanced. Quoting the textbook example (Eq. 1.2) strengthens the answer and is appropriate for 1 mark. Avoid writing a long explanation — one definition line plus one example is sufficient.