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Subject Test Chemistry

Question 8 of 13

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SAT Subject Test

The set of lettered choices below refers to multiple questions. Select the one lettered choice that best fits each statement or answers each question. A choice may be used once, more than once, or not at all in each set.

A type of ion found in potassium phosphate

Select an Answer

text X end text to the power of plus

Correct Answer: 
Yes

text X end text to the power of 2 plus end exponent

Correct Answer: 
No

text X end text to the power of 3 plus end exponent

Correct Answer: 
No

text XO end text subscript 3 text end text to the power of 2 minus end exponent

Correct Answer: 
No

text XO end text subscript 4 text end text to the power of 2 minus end exponent

Correct Answer: 
No

The chemical formula of potassium phosphate is text K end text text end text subscript 3 end subscript text PO end text subscript 4 end subscript. The potassium ion is text K end text to the power of plus and the phosphate ion is text PO end text subscript 4 text end text to the power of 3 minus end exponent. The text K end text to the power of plus ion has the form text X end text to the power of plus and the phosphate ion has the form text XO end text subscript 4 text end text to the power of 3 minus end exponent; therefore, the correct answer is choice (A).

Question Difficulty: 
easy