Chemical Reactions of Aluminium and Zinc Oxides

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What is unique about gold and silver in nature?

They are highly reactive

They are always found in their combined state

They are always found in their free state (correct)

They are not found in nature

What is the nature of metallic oxides?

They are basic (correct)

They are neutral

They are acidic

They are amphoteric

Which non-metal is known for its lustrous property?

Phosphorus

Sulfur

Iodine (correct)

Chlorine

What is the green substance formed on a copper plate left exposed to air for a week in a bathroom?

Basic copper carbonate Signup and view all the answers

What occurs when a metal loses an electron and a non-metal gains it?

An electrovalent compound is formed Signup and view all the answers

What is the state of ionic compounds at room temperature?

Solids Signup and view all the answers

What happens when calcium is treated with water?

It reacts violently with water and releases hydrogen Signup and view all the answers

Which metal would be displaced from the solution of its salts by other three metals?

Cu Signup and view all the answers

In which state do ionic compounds conduct electricity?

All of the above Signup and view all the answers

What is the oxide of iron obtained on prolonged reaction of iron with steam?

Fe3O4 Signup and view all the answers

What is the primary source of metals?

Earth's crust Signup and view all the answers

Which element reacts with oxygen to give a compound with a high melting point?

Calcium Signup and view all the answers

What is the term for the process of extracting metals from their ores?

Metallurgy Signup and view all the answers

Which of the following metals is typically extracted by electrolysis?

Potassium Signup and view all the answers

What is the term for naturally occurring elements or compounds in the Earth's crust?

Minerals Signup and view all the answers

Which of the following metals is typically found in its free state in nature?

Silver Signup and view all the answers

What is collected over water after the metal reacts with steam?

Hydrogen gas Signup and view all the answers

Which metal has the slowest reaction with steam?

Iron Signup and view all the answers

What happens when hydrogen gas is tested with a lighted match stick?

It burns with a 'pop' sound Signup and view all the answers

Which of the following metals does NOT react with water or steam?

Lead Signup and view all the answers

What is the product formed when metals react with dilute acids?

Salt and hydrogen gas Signup and view all the answers

What gas is NOT evolved when a metal reacts with nitric acid?

Hydrogen Signup and view all the answers

Which metals can dissolve in Aqua-Regia?

All metals Signup and view all the answers

What mixture ratio is used to create Aqua-Regia?

1 part nitric acid and 3 parts hydrochloric acid Signup and view all the answers

What type of oxide is formed by aluminium and zinc metals?

Amphoteric oxide Signup and view all the answers

What are the products when aluminium oxide reacts with hydrochloric acid?

Aluminium chloride and water Signup and view all the answers

In the reaction between aluminium oxide and sodium hydroxide, what does aluminium oxide act as?

Acidic oxide Signup and view all the answers

What is the product of the reaction between zinc oxide and hydrochloric acid?

Zinc chloride Signup and view all the answers

When zinc oxide reacts with sodium hydroxide, what compound is formed?

Sodium zincate Signup and view all the answers

Which metal reacts violently with cold water to form metal hydroxide and hydrogen gas?

Sodium Signup and view all the answers

What is the product when calcium reacts with water?

Calcium hydroxide and hydrogen gas Signup and view all the answers

What do aluminium and iron produce when they react with steam?

Aluminium oxide and iron oxide with hydrogen gas Signup and view all the answers

What is the atomic number of calcium?

20 Signup and view all the answers

What is the electron configuration of an oxygen atom?

2,6 Signup and view all the answers

Which property of gold makes it suitable for making ornaments?

Ductility and lustre Signup and view all the answers

Which metals melt when kept on the palm?

Gallium and caesium Signup and view all the answers

Which statement is true about silver and copper?

They are the best conductors of heat. Signup and view all the answers

Why are sodium and potassium stored under oil?

They react with water Signup and view all the answers

What happens when soft iron nails are dipped in a strong solution of copper sulphate?

A greenish-black solution is formed Signup and view all the answers

Why is aluminium's corrosion less than that of iron?

Aluminium is covered with a strong protective layer of oxide Signup and view all the answers