1) The chemical formula of calcium carbonate is .................... a) MgSO4 b) Na2CO3 c) CaCO3 d) CaSO4 2) The number of atoms in ammonium nitrate molecule equals.............. a) 5 b) 7 c) 9 d) 8 3) All of these substances turn litmus paper into red except.................. a) NaOH b) HCl c) HNO3 d) H2SO4

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