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Question
There are four solutions A, B, C and D with pH values as follow:
| Solution | A | B | C | D |
| pH | 2.0 | 7.0 | 8.0 | 12.0 |
Which solution(s) would liberate hydrogen gas with zinc?
Options
A only
D only
A and D
B and C
Solution
A only.
Explanation:
Zinc quickly combines with acid to generate hydrogen bubbles, and solution A with a pH of 2.0 is extremely acidic.
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