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

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

Dilute sulfuric acid, then lead(II) nitrate solution

Sodium hydroxide solution, then warming gently

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?

2:1

1:1

1:2

1:3

None

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

Copper(II) ion (Cu2+)

Iron(III) ion (Fe3+)

Zinc ion (Zn2+)

Iron(II) ion (Fe2+)

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?

Calcium ion

Ammonium ion

Sodium ion

Zinc ion

None

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

Titration of an acid with an alkali

Double decomposition (precipitation)

Reacting a reactive metal with a dilute acid

Reacting a metal carbonate with a dilute acid

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 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

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

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 increase the concentration of the final salt solution.

To ensure all of the hydrochloric acid has reacted completely.

To prevent the salt from decomposing upon heating.

To act as a catalyst for the reaction.

None

10.

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?

Copper(II) carbonate

Magnesium carbonate

Zinc carbonate

Lead(II) carbonate

None

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