Uses of baking soda

This type of question, asked 3 times: 2023, 2025, 2026. All 3 questions below, oldest first.

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Question 1
2023
4 $Fresh milk has a pH of 6. To delay its curdling, a chemical substance is added to it, which is :$
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Question 2
2025
28 (a) $State the chemical property in each case on which the following uses of baking soda are based upon : (i) as an anti-acids (ii) as a constituent in making baking powder (iii) in soda-acid fire-extinguishers$
Question 3
2026
23 $Which one of the following chemicals is used in soda-acid fire-extinguishers ?$
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Question 1