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

A student adds sodium hydroxide solution to an unknown salt solution, forming a white precipitate. When excess sodium hydroxide is added, the precipitate dissolves to form a colorless solution. Based on the provided flowcharts, which cation could be present?

Magnesium ion (Mg2+)

Zinc ion (Zn2+)

Iron(III) ion (Fe3+)

Copper(II) ion (Cu2+)

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 dirty green precipitate forms and remains insoluble.

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

A blue precipitate forms and remains insoluble.

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 sulfuric acid, then lead(II) nitrate solution

Dilute nitric acid, then silver nitrate solution

Sodium hydroxide solution, then warming gently

Dilute hydrochloric acid, then barium chloride solution

None

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 ensure all of the hydrochloric acid has reacted completely.

To increase the concentration of the final salt solution.

To prevent the salt from decomposing upon heating.

To act as a catalyst for the reaction.

None

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

Zinc (Zn) and carbon dioxide (CO2)

Zinc oxide (ZnO) and carbon dioxide (CO2)

Zinc oxide (ZnO) and carbon monoxide (CO)

Zinc chloride (ZnCl2) and oxygen (O2)

None

A student performs a flame test on a salt and observes no distinct color. Then, the student adds sodium hydroxide solution to an aqueous solution of the salt and gently warms it. A gas is produced that turns damp red litmus paper blue. Which cation is present?

Ammonium ion

Zinc ion

Sodium ion

Calcium ion

None

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

Ammonia (NH3)

Oxygen (O2)

Hydrogen (H2)

Carbon dioxide (CO2)

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?

Magnesium carbonate

Zinc carbonate

Lead(II) carbonate

Copper(II) carbonate

None

In the reaction MgCO3 + 2HCl→MgCl2 + CO2 + H2O, what is the mole ratio of magnesium carbonate (MgCO3) to hydrochloric acid (HCl) that is required for a complete reaction?

1:3

2:1

1:2

1:1

None

10.

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

Titration of an acid with an alkali

Reacting a reactive metal with a dilute acid

Reacting a metal carbonate with a dilute acid

Double decomposition (precipitation)

None

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