Basically since potassium chloride is an ionic compound as it consists of a metal and a nonmetal, the potassium atom will donate one of its valence electrons to chlorine that will accept it and as a result produce oppositely charged ions, where the K + ion and the Cl - ion will attract forming an ionic bond. The compound that results is potassium chloride.
H2SO4 + ZN ------- ZNSO4+ H2
(SO4)²The sulphate salt is formed......
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Answer: Air
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You just switch them around
Blow a lot of air into it you can stick an air pump and when your done pumping quickly put tape over the hole