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14 November, 14:59

Which of the following is a correct formula unit of an ionic compound?

Al2F3

Ca2O

Ca (OH) 2

KCl2

+2
Answers (2)
  1. 14 November, 18:19
    0
    Answer : The correct formula unit of an ionic compound is Ca (OH) 2

    Explanation:

    An ionic compound is formed when a metal atom donates one or more electrons to a non metal atom.

    During this process, metal gains a positive charge and a nonmetal gets a negative charge.

    In an ionic compound, these charges on the ions are balanced so that the overall compound is neutral.

    Let us check which of the given compounds have a neutral charge.

    1) Al2F3 : Charge on Al is + 3 and that on F is - 1.

    The total charge on 2 Al is 2x3 = + 6.

    The total charge on 3 F atoms is 3x (-1) = - 3

    The overall charge on the compound is + 6-3 = + 3.

    That means the given formula unit is not correct.

    2) Ca2O : Charge on Ca is + 2 and that on O is - 2

    Total charge on Ca is 2x2 = + 4

    The overall charge is + 4-2 = + 2

    Therefore the given formula unit is not correct.

    3) Ca (OH) 2 : The charge on Ca ion is + 2 and that on OH is - 1.

    The total charge on 2 OH ions is 2x (-1) = - 2

    The overall charge is + 2-2 = 0

    This gives a neutral compound.

    Therefore the given formula unit is correct.
  2. 14 November, 18:56
    0
    The answer is C)

    Ca (OH) 2

    I took the test and it was correct
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