CBSE 2025 · Region 5 · Set 1 · Q5 · 1 mark
The values of a, b, c and d in the following balanced chemical equation are respectively : \[\mathbf{a} \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \xrightarrow{\text { heat }} \mathbf{b} \mathrm{PbO}+\mathbf{c} \mathrm{NO}_{2}+\mathbf{d} \mathrm{O}_{2} \]
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 2, 2, 4, 1$
Chemical Reactions and EquationsWriting and Balancing Chemical EquationsApplymcqmedium
More from Chemical Reactions and Equations
- Why do we balance a chemical equation? Name and state the law that suggests the balancing of a chemical…2025 · asked 3×
- The main observations while performing the experiment of burning magnesium ribbon in air are: (i) Magnesium…2025 · asked 3×
- In which one of the following situations a chemical reaction does not occur?2025 · asked 3×
- The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is2025 · asked 3×
- Assertion: Silver chloride turns grey in sunlight. Reason (R): Decomposition of silver chloride into silver…2025 · asked 3×
- Assertion: Decomposition reactions are generally endothermic reactions. Reason (R): Decomposition of organic…2025 · asked 3×
- List the possible sources of energy required in decomposition reactions. Illustrate any one with a suitable…2025 · asked 3×
- Electrolysis of water is a decomposition reaction. The mass ratio (M H: M O) of hydrogen and oxygen gases…2025 · asked 3×
CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.