The pH of human blood is approximately: MCQ with Answer and Explanation

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The pH of human blood is approximately:

A. 9

B. 7.4

C. 2

D. 5.5

Answer: Option B

Solution (By JKSSB Mock Tests)

Blood pH is slightly alkaline, maintained between 7.35 and 7.45. Deviation can cause acidosis or alkalosis.

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Question #1

In the molecule BF₃, the type of bonding is:

A. Metallic

B. Coordinate

C. Ionic

D. Covalent

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Correct Answer: Option D

Explanation:
Boron trifluoride (BF₃) has covalent bonds where boron shares three electrons with three fluorine atoms. Although BF₃ can accept a lone pair to form coordinate bonds (as in BF₄⁻), its own bonds are polar covalent. Ionic bonding occurs between metal and non-metal.

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Question #2

Which enzyme converts glucose into ethanol?

A. Invertase

B. Zymase

C. Urease

D. Maltase

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Correct Answer: Option B

Explanation:
Zymase, a complex of enzymes from yeast, catalyzes fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Invertase hydrolyzes sucrose; urease hydrolyzes urea; maltase converts maltose to glucose.

This question belongs to: Science chemistry

Question #3

The reaction between magnesium and dilute hydrochloric acid produces:

A. MgCl₂ and O₂

B. MgCl₂ and H₂

C. MgO and H₂O

D. MgO and Cl₂

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Correct Answer: Option B

Explanation:
Mg + 2HCl → MgCl₂ + H₂↑. Magnesium displaces hydrogen from acid. This is a single displacement and redox reaction. Copper does not react similarly.

This question belongs to: Science chemistry

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