DP Chemistry (last assessment 2024)

Question 20N.1.sl.TZ0.9

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1.sl.TZ0.9
Level	sl	Paper	1	Time zone	TZ0
Command term	Deduce	Question number	9	Adapted from	N/A

[Maximum mark: 1]

20N.1.sl.TZ0.9

Which formula is correct?

A. ${NH}_{4} {PO}_{4}$

B. ${({NH}_{4})}_{2} {PO}_{4}$

C. ${({NH}_{4})}_{3} {PO}_{4}$

D. ${({NH}_{4})}_{3} {({PO}_{4})}_{2}$

[1]

Markscheme

Examiners report

64% of candidates picked the correct formula for ammonium phosphate with (NH₄)₂PO₄ being the incorrect answer chosen most frequently. NH₄PO₄ or (NH₄)₃(PO₄)₂ was rarely selected.

Syllabus sections

Core

Core » Topic 4: Chemical bonding and structure » 4.1 Ionic bonding and structure

Core » Topic 4: Chemical bonding and structure

Question 20N.1.sl.TZ0.9

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