Question

hi pls tell fast exam tomorrow

Answer 1

1) KOH + HNO3 → KNO3 + H2O
2) Cu + 2AgNO3 --> Cu(NO3)2 + 2Ag
3) third question is wrong it is sodium phosphate + calcium chloride this is because reactant cannot have two sodiums

balanced eqn. for third eqn is - 2Na3PO4+3CaCl2→Ca3(PO4)2+6NaCl

4) NH4Cl + NaOH  ->  NH3 + NaCl + H2O

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Answer 2

the reaction between nitric acid, HNO3, and the base potassium hydroxide, KOH. Neutralization produces a salt and water. KNO3 is the salt in the above reaction. 
Copper + Silver nitrate => copper nitrate