Hydrogen Gas Preparation

Which of the following metals is commonly used for the laboratory preparation of hydrogen gas?

• Zinc

• Copper

• Aluminum

• Iron

Which acid is generally used in the laboratory to prepare hydrogen gas?

• Sulfuric acid (H2SO4)

• Hydrochloric acid (HCl)

• Nitric acid (HNO3)

• Acetic acid (CH3COOH)

What is the chemical reaction involved in the preparation of hydrogen using zinc and dilute hydrochloric acid?

• Zn + 2HCl → ZnCl2 + H2

• Zn + 2H2SO4 → ZnSO4 + H2

• Zn + HCl → ZnCl + H2

• Zn + H2O → ZnO + H2

Which of the following apparatus is used to collect hydrogen gas in the laboratory?

• Open flask with air

• Inverted gas jar or test tube

• Test tube with mercury

• Beaker filled with water

Hydrogen gas is collected over water because it is:

• Hydrogen gas is collected over water because it is heavier than air.

• Hydrogen gas is collected over water because it is soluble in water.

• Hydrogen gas is collected over water because it is a liquid at room temperature.

• Hydrogen gas is collected over water because it is less dense than air.

Which of the following statements about hydrogen gas is true?

• Hydrogen gas is highly flammable.

• Hydrogen gas is heavier than air.

• Hydrogen gas is non-toxic and inert.

• Hydrogen gas is a noble gas.

What is the physical state of hydrogen gas at room temperature?

• Liquid

• Plasma

• Gas

• Solid

What is the primary use of hydrogen gas in industries?

• Production of carbon dioxide

• Manufacturing of plastics

• Production of ammonia and petroleum refining

• Storage of solar energy

What is the molecular formula of hydrogen gas?

• H2O

• O2

• H2

• N2

What safety precautions should be taken when handling hydrogen gas?

• Use regular tools for handling, avoid PPE, store in open containers, and ignore leak checks.

• Ensure tight sealing, use sparking tools, keep ignition sources close, and store in flammable containers.

• Ensure proper ventilation, use non-sparking tools, keep ignition sources away, store in appropriate containers, check for leaks, and wear PPE.

• Ventilate poorly, wear no protective gear, check for leaks frequently, and use any available tools.