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

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

Zinc (Zn) and carbon dioxide (CO2)

Zinc chloride (ZnCl2) and oxygen (O2)

Zinc oxide (ZnO) and carbon dioxide (CO2)

Zinc oxide (ZnO) and carbon monoxide (CO)

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

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+)

Copper(II) ion (Cu2+)

Iron(III) ion (Fe3+)

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

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

A dirty green precipitate forms and remains insoluble.

A blue precipitate forms and remains insoluble.

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 act as a catalyst for the reaction.

To prevent the salt from decomposing upon heating.

To ensure all of the hydrochloric acid has reacted completely.

To increase the concentration of the final salt solution.

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?

1:1

1:2

1:3

2:1

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)

Carbon dioxide (CO2)

Hydrogen (H2)

None

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

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

Reacting lead metal with iodine solution.

Reacting lead(II) oxide with hydroiodic acid

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

None

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

Zinc ion (Zn2+)

Iron(II) ion (Fe2+)

Iron(III) ion (Fe3+)

Copper(II) ion (Cu2+)

None

10.

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

Reacting a reactive metal with a dilute acid

Titration of an acid with an alkali

Reacting a metal carbonate with a dilute acid

Double decomposition (precipitation)

None

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