Kuiz Sains Tambahan Tingkatan 5 Bab 2 Set 1

SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 2 Set 1

Penerokaan Unsur Dalam Alam (English)

KUIZ INI MENGANDUNGI 10 SOALAN

During the preparation of copper(II) chloride from copper(II) oxide and hydrochloric acid, why is the copper(II) oxide powder added in excess?

To act as a catalyst for the reaction.

To ensure all of the hydrochloric acid has reacted completely.

To prevent the salt from decomposing upon heating.

To increase the concentration of the final salt solution.

None

Which of the following methods is most suitable for preparing a pure, dry sample of the insoluble salt lead(II) iodide (PbI2)?

Heating solid lead(II) nitrate with solid potassium iodide.

Reacting lead metal with iodine solution.

Reacting lead(II) oxide with hydroiodic acid

Mixing aqueous solutions of lead(II) nitrate and potassium iodide.

None

A gas produced during a chemical reaction is tested by bubbling it through limewater, which turns milky. What is this gas?

Ammonia (NH3)

Carbon dioxide (CO2)

Oxygen (O2)

Hydrogen (H2)

None

A student adds aqueous ammonia dropwise to a solution containing copper(II) ions until the ammonia is in excess. What is the expected final observation?

A blue precipitate forms and remains insoluble.

A dirty green precipitate forms and remains insoluble.

A light blue precipitate forms and then dissolves to form a dark blue solution.

A white precipitate forms and then dissolves to form a colorless solution.

None

To test for the presence of chloride ions (Cl−) in a solution, which two reagents are typically added in sequence?

Dilute hydrochloric acid, then barium chloride solution

Dilute nitric acid, then silver nitrate solution

Sodium hydroxide solution, then warming gently

Dilute sulfuric acid, then lead(II) nitrate solution

None

The substance known as 'Plaster of Paris' is used in medicine to create casts for broken bones. According to the textbook, what is the chemical name for this salt?

Sodium chloride (NaCl)

Calcium carbonate (CaCO3)

Potassium nitrate (KNO3)

Calcium sulfate (CaSO4)

None

During a qualitative analysis, an aqueous solution is observed to be blue. Which cation is most likely present in the salt solution?

Iron(III) ion (Fe3+)

Copper(II) ion (Cu2+)

Zinc ion (Zn2+)

Iron(II) ion (Fe2+)

None

A student heats a white crystalline salt in a test tube. The residue is yellow when hot and turns white upon cooling. A gas is also produced that turns limewater cloudy. What is the most likely identity of the salt?

Zinc carbonate

Lead(II) carbonate

Copper(II) carbonate

Magnesium carbonate

None

When solid zinc carbonate (ZnCO3) is heated strongly, it undergoes thermal decomposition. What are the expected products?

Zinc oxide (ZnO) and carbon dioxide (CO2)

Zinc (Zn) and carbon dioxide (CO2)

Zinc oxide (ZnO) and carbon monoxide (CO)

Zinc chloride (ZnCl2) and oxygen (O2)

None

10.

What is the most suitable method for preparing an insoluble salt like lead(II) sulfate (PbSO4)?

Double decomposition (precipitation)

Reacting a metal carbonate with a dilute acid

Reacting a reactive metal with a dilute acid

Titration of an acid with an alkali

None

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