Hydrogen and its Compounds - Exam Prep Problem Set

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Hydrogen and its Compounds - Problem Set

Q. In which of the following compounds does hydrogen act as a Lewis acid?

A. H2O
B. HCl
C. BF3
D. H2

Solution

In HCl, hydrogen can act as a Lewis acid by accepting an electron pair.

Correct Answer: B — HCl

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Q. What is the coordination number of hydrogen in the complex ion [H2O]2+?

A. 1
B. 2
C. 3
D. 4

Solution

In the complex ion [H2O]2+, the coordination number of hydrogen is 2.

Correct Answer: B — 2

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Q. What is the pH of a solution of hydrochloric acid (HCl) at a concentration of 0.01 M?

A. 1
B. 2
C. 3
D. 4

Solution

A 0.01 M solution of hydrochloric acid (HCl) has a pH of 2, as it is a strong acid that dissociates completely.

Correct Answer: B — 2

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Q. What is the primary product when hydrogen gas reacts with chlorine gas?

A. HCl
B. Cl2
C. H2Cl2
D. H2O

Solution

The reaction between hydrogen gas (H2) and chlorine gas (Cl2) produces hydrogen chloride (HCl).

Correct Answer: A — HCl

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Q. What is the primary product when hydrogen gas reacts with oxygen gas?

A. Water
B. Hydrogen peroxide
C. Ozone
D. Hydrochloric acid

Solution

The primary product of the reaction between hydrogen and oxygen is water (H2O).

Correct Answer: A — Water

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Q. What type of bond is formed between hydrogen and chlorine in hydrogen chloride (HCl)?

A. Ionic
B. Covalent
C. Metallic
D. Hydrogen

Solution

Hydrogen chloride (HCl) features a covalent bond between hydrogen and chlorine.

Correct Answer: B — Covalent

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Q. Which of the following metals can react with water to produce hydrogen gas?

A. Gold
B. Iron
C. Sodium
D. Copper

Solution

Sodium reacts vigorously with water to produce hydrogen gas.

Correct Answer: C — Sodium

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