Calcium reacts with each of two substances 1) magnesium and hydrochloric acid 2) water and potassium hydroxide

| August 6, 2021 | education

Calcium reacts with each of two substances 1) magnesium and hydrochloric acid 2) water and potassium hydroxide 3) sodium hydroxide and hydrochloric acid 4) hydrochloric acid and chlorine why?

1) Ca + 2HCl -> CaCl2 + H2

Calcium is an active metal and displaces hydrogen from acids with the formation of salt and the release of free hydrogen

Calcium does not react with magnesium, since metal cannot react with metal

2) Ca + H2O -> CaO + H2

Calcium is in the second group of the periodic system and belongs to the lusher earth metals, which, when interacting with water, give oxides

Calcium does not react with KOH, since it is less active than potassium

3) calcium does not react with sodium hydroxide, since sodium is more reactive

4) Ca + 2HCl -> CaCl2 + H2

Ca + Cl2 -> Ca Cl2

Calcium reacts with halogens to form salts

Correct answer is 4



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