DP Chemistry (last assessment 2024)

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Question 19M.1.hl.TZ1.25

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.hl.TZ1.25
Level hl Paper 1 Time zone TZ1
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
19M.1.hl.TZ1.25

With which do most acids react?

   I. sodium hydrogen carbonate
   II. magnesium
   III. calcium sulfate

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

[1]

Markscheme

A

Examiners report

This question on reactivity of acids with carbonates and metals (first bullet point in Topic 8.2) confused higher and lower scoring candidates alike and was the worst answered question in paper 1. One teacher commented “The question does not seem clear. They would all react with acids, but what does “most acids” mean?”.

Syllabus sections