Please tell answers for this

Dear student,
The formulas and balanced chemical reactions are given below;
1) 2KNO₃ (aq)  → 2KNO₂ (aq) + O₂ (g)
2) Zn(s) + H₂SO₄ (dil.) → ZnSO₄(aq) + H₂(g)
3) Ca (s) + 2H₂O (l) → Ca(OH)₂(aq)+H₂ (g)
Regards
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