Sulphuric acid is a strong acid and magnesium hydroxide is a strong base, so naturalisation reaction takes place và metal salt và water is produced.(neutral) 

Sulphuric acid produces two H+ ions on dissociation.

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Magnesium hydroxide also produces two ions of hydroxide ion on dissociation.

When equal volume of both solutions are mixed together they form water and salt by neutralisation reaction as one is acid và other is base.

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Therefore, for neutral solution universal indicator shows green colour.

Mg(s) + H2SO4→ MgSO4(aq) + H2(g)


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