✓ Board-verified
Science · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 1 · Q26
What happens when(i)lead (II) nitrate is heated ?(ii)iron (II) sulphate is heated ?(iii)silver chloride is exposed to sunlight ? Write balanced chemical equations of the reactions involved in support of your answer.
What happens when
(i)
lead (II) nitrate is heated ?
(ii)
iron (II) sulphate is heated ?
(iii)
silver chloride is exposed to sunlight ? Write balanced chemical equations of the reactions involved in support of your answer.
Marking-scheme solution
(i) Brown fumes of nitrogen dioxide are formed.
\[2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s}) \xrightarrow{\text { Heat }} 2 \mathrm{PbO}(\mathrm{~s})+4 \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})
\]
(ii) Smell of burning sulphur is observed/ Colour of crystal changes.
\[2 \mathrm{FeSO}_{4}(\mathrm{~s}) \xrightarrow{\text { Heat }} \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{SO}_{2}(\mathrm{~g})+\mathrm{SO}_{3}(\mathrm{~g})
\]
(iii) White silver chloride turns grey.
\[2 \mathrm{AgCl}(\mathrm{~s}) \xrightarrow{\text { Sunlight }} 2 \mathrm{Ag}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g})
\]
More from Chemical Reactions and Equations
- Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its…2024 · asked 3×
- Why do we balance a chemical equation? Name and state the law that suggests the balancing of a chemical…2025 · asked 3×
- Which of the following is an example of a displacement reaction?2026 · asked 3×
- Define a double displacement reaction. Write the chemical equation of a double displacement reaction which is…2023 · asked 3×
- The balanced chemical equation showing reaction between quicklime and water is:2023 · asked 3×
- C 6 H 12 O 6(aq)+6 O 2( g) → 6 CO 2( g)+6 H 2 O (l). The above reaction is an example of -2026 · asked 3×
- Which one of the following reactions is different from the remaining three?2024 · asked 3×
- (i) While electrolysing water before passing the current some drops of an acid are added. Why? Name the gases…2023 · asked 3×
CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.