Question

why should a magnesium ribbon be cleaned before burning in air ?​

Answer 1

$\huge \mathcal \pink{★Answer★}$

The magnesium ribbon should be cleaned before burning in the air because the layer of magnesium oxide (which is formed due to the reaction of magnesium with air ) can be removed in order to get the desired chemical reaction.

Also in order to remove the oxide layer, the presence of which slowdowns the oxidation process. So, by cleaning it, the burning process takes place easily.

Hope it helps uh! ☺

Answer 2

Over the years, pop culture has raised scores of burning questions for future generations, among them: Why was there a pail of water in the corridor of the Wicked Witch of the West’s castle? (A half-century on, Wicked offered one patently bogus theory.) Why did the Howells bring so much luggage for a three-hour tour? (Crickets on that.) More recently: Why did the Death Star, the most powerful attack weapon in the history of that far-far-away galaxy, have a little nook where a well-placed bomb could make the whole thing go boom? Now, there’s a mammoth movie devoted to that very question. It’s called Rogue One: A Star Wars Story, and it turns out that said nook was no accident and that many rebels and Empire storm troopers had to perish on the way to the immortal holograph that began, “Help me, Obi-Wan!”