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Science · 2023 · 2 marks
CBSE 2023 · Region 6 · Set 2 · Q21
A metal nitrate 'A' on heating gives a metal oxide along with evolution of a brown coloured gas 'B' and a colourless gas, which helps in burning.…
A metal nitrate 'A' on heating gives a metal oxide along with evolution of a brown coloured gas 'B' and a colourless gas, which helps in burning. Aqueous solution of 'A' when reacted with potassium iodide forms a yellow precipitate.
(a)
Identify 'A' and 'B'
(b)
Name the types of both the reactions involved in the above statement.
Marking-scheme solution
(a) A = Lead Nitrate/Pb \(\displaystyle \left(\mathrm{NO}_{3}\right)_{2} \mathrm{B}=\) Nitrogen dioxide \(\displaystyle / \mathrm{NO}_{2}\)
(b) Decomposition reaction Double-displacement or Precipitation reaction.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.