Multiple Choice
What ion is formed when an atom of magnesium (Mg) loses two electrons?
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2. Atoms & Elements
Ions
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Which statement best describes the species XO_2^- that is dissociated from HXO_2 in aqueous solution?
A
XO_2^- is a radical species formed by the loss of an electron from HXO_2.
B
XO_2^- is a cation formed by the gain of a proton by HXO_2.
C
XO_2^- is a neutral molecule that does not carry any charge.
D
XO_2^- is an anion formed when HXO_2 loses a proton (H^+) in water.
Verified step by step guidance1
Identify the species involved: HXO_2 is an acid that can dissociate in water, and XO_2^- is the species formed after dissociation.
Recall that acids dissociate by losing a proton (H^+), so when HXO_2 dissociates, it loses H^+ and forms its conjugate base.
Understand that losing a proton (H^+) means the species gains a negative charge, making XO_2^- an anion, not a neutral molecule or a cation.
Recognize that XO_2^- is not a radical because radicals have unpaired electrons, and this species is formed by proton loss, not electron loss.
Conclude that the best description is that XO_2^- is an anion formed when HXO_2 loses a proton (H^+) in aqueous solution.
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