Choose the best: Chemical reactions and equations — task. Science CBSE, Class 10.

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Choose the best answer:

1. The magnesium ribbon is cleaned with sandpaper before it is burned in the air. Why?

Remove the deposited carbonate layer on magnesium ribbon.
Remove the deposited nitride layer on magnesium ribbon.
Remove the deposited oxide layer on magnesium ribbon.
Remove the deposited oxide layer on copper ribbon.

2. Change the following statements into chemical equations.

Hydrogen combine the chlorine to form hydrogen chloride.

\(H_2\) + \(Cl_2\) → \(2HCl\)
\(H_2\) + \(Cl\) → \(2HCl\)
\(H_2\) + \(Cl_2\) → \(HCl\)
\(H_3\) + \(Cl_2\) → \(2HCl\)

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