[" Question 4.Balance the following chemical "],[" equitations:- "],[" a) "HNO_(3)+Ca(OH)_(2)rarr Ca(NO3)_(2)+H_(2)O],[" b) "NaOH+H_(2)SO_(4)->Na_(2)SO_(4)+H_(2)O],[" c) "NaCl+AgNO_(3)rarr AgCl+NaNO_(3)],[" d) "BaCl_(2)+H_(2)SO_(4)->BaSO_(4)+HCl]