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Chemistry CBSE Live product
Class 10 (2026-27)
Chemical reactions and equations
Revision I - Chemical reactions and equations
4.
Word equation to balanced chemical equation
Question:
4
m.
Choose the best answer:
1.
The magnesium ribbon is cleaned with sandpaper before it is burned in the air. Why?
Remove the deposited sulphide layer on magnesium ribbon.
Remove the deposited carbonate layer on magnesium ribbon.
Remove the deposited nitride layer on magnesium ribbon.
Remove the deposited oxide layer on magnesium ribbon.
2.
Change the following statements into chemical equations.
Hydrogen sulphide gas burns in air to give water and sulphur dioxide
\(2H_2S\) + \(3O_2\) → \(2H_2O\) + \(2SO_2\)
\(2H_2S\) + \(3O_2\) → \(2H_2O\) + \(3SO_2\)
\(2HS\) + \(3O_2\) → \(2H_2O\) + \(2SO_2\)
\(2H_2S\) + \(3O_2\) → \(2H_2O\) + \(2SO_3\)
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