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

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?

Potassium nitrate (KNO3)

Calcium sulfate (CaSO4)

Sodium chloride (NaCl)

Calcium carbonate (CaCO3)

None

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

Hydrogen (H2)

Carbon dioxide (CO2)

Ammonia (NH3)

Oxygen (O2)

None

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

Reacting lead metal with iodine solution.

Reacting lead(II) oxide with hydroiodic acid

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

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

None

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

Reacting a reactive metal with a dilute acid

Double decomposition (precipitation)

Reacting a metal carbonate with a dilute acid

Titration of an acid with an alkali

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 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.

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

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(III) ion (Fe3+)

Copper(II) ion (Cu2+)

Iron(II) ion (Fe2+)

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?

Iron(III) ion (Fe3+)

Magnesium ion (Mg2+)

Zinc ion (Zn2+)

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 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.

A dirty green precipitate forms and remains insoluble.

A blue precipitate forms and remains insoluble.

None

10.

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

1:2

1:3

1:1

None

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