1) Which is the correct ionic formula for sodium iodide? a) NaI b) Na+I− c) (Na+)(I−) d) (Na)+(I)− 2) Which is correct ionic formula for calcium sulfide? a) Ca+S− b) Ca2+S2− c) (Ca2+)(S2−) d) (Ca)2+(S)2− 3) Which is correct ionic formula for sodium oxide? a) Na2+O2− b) Na+O2− c) (Na2+)O2− d) (Na+)2O2− 4) Which is correct ionic formula for potassium carbonate? a) K2+CO32− b) K+CO32− c) (K+)2CO32− d) (K+)2(CO32−) 5) Which is correct ionic formula for ammonium phosphate? a) (NH4+)3PO43− b) NH4+PO43− c) (NH4)+3PO43− d) (NH4+)3(PO43−) 6) Which is correct ionic formula for aluminium sulfide? a) (Al23+)(S32−) b) (Al3+)2(S2−)3 c) (Al2)3+(S3)2− d) Al3+2S2−3 7) Which is the correct ionic formula for copper(II) hydroxide? a) Cu2+(OH)2− b) Cu2+OH2− c) (Cu2+)(OH−)2 d) Cu2+(OH−)2 8) What is the charge on the chromium ion in Cr2O3? a) 2+ b) 3+ c) 2− d) 3− 9) What is the charge on the silver ion in Ag2O? a) + b) − c) 2+ d) 2− 10) What is the charge on the manganese ion in MnO2? a) 2− b) 4− c) 2+ d) 4+

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