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Class 9 Chemistry · Chapter 4 · Test 3

Binary Ionic Formulas

25 MCQs covering cations, anions, ionic charges, the crisscross method, charge balance, and writing correct formulas of binary ionic compounds.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What is the charge on a sodium ion?

    • A+1
    • B+2
    • C-1
    • D-2
    Show answer

    Answer: A

    Sodium loses one electron to form Na+.

  2. Question 2

    What is the charge on an oxide ion?

    • A-2
    • B-1
    • C+1
    • D+2
    Show answer

    Answer: A

    Oxygen gains two electrons to form O2-.

  3. Question 3

    Which ion is formed by magnesium?

    • AMg2+
    • BMg+
    • CMg2-
    • DMg-
    Show answer

    Answer: A

    Magnesium loses two electrons to form Mg2+.

  4. Question 4

    What is the charge on a chloride ion?

    • A-1
    • B+1
    • C-2
    • D+2
    Show answer

    Answer: A

    Chlorine gains one electron to form Cl-.

  5. Question 5

    What is the correct formula of lithium oxide?

    • ALi2O
    • BLiO
    • CLiO2
    • DLi2O2
    Show answer

    Answer: A

    Two Li+ ions balance the charge of one O2- ion.

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