Blood buffer, pH of blood and uses of buffers

This type of question, asked 4 times: 9 May 2023 S2, 11 Apr 2026 S2, 13 Apr 2026 S2, 20 Apr 2026 S1. All 4 questions below, oldest first.

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Question 1
9 May 2023 S2
54 $Which from following buffers is used to maintain the pH of human blood naturally?$
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Question 2
11 Apr 2026 S2
10 $What is the normal pH of human blood?$
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Question 3

13 Apr 2026 S2

\mathrm{HCO_3^{-1} + H_2CO_3}

List I (Buffers)	List II (Applications)
(A) $\mathrm{HCO_3^{-1} + H_2CO_3}$	(I) Maintain the pH of blood forms $7.36$ to $7.42$
(B) Phosphates	(II) In Medicine
(C) Sodium Citrate	(III) In Qualitative analysis of basic radicals
(D) $\mathrm{NH_4Cl + NH_4OH}$	(IV) In fertilizers

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Question 4
20 Apr 2026 S1
9 $What is the normal pH range of human blood?$
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