What happens when ZnCO 3 is heated in the absence of oxygen?

When ZnCO 3 is heated in the absence of air it undergoes decomposition giving Zinc oxie and carbon dioxide, this process is known as calcination ZnCO 3 ( s ) → Heat ZnO ( s ) + CO 2 ( g )

What happens when a mixture of Cu 2 O and Cu 2 S is heated?

When a mixture of Cu 2 O and Cu 2 S is heated, they react together to give copper metal and sulphur dioxide gas. Copper glance, Cu 2 S, is roasted in the presence of air to get converted to Cu 2 O. Cu 2 O then reacts with non-oxidized Cu 2 S ore in the absence of air to form copper metal.

E M B I B E

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 15

MEDIUM

10th CBSE

IMPORTANT

Earn 100

Give the reaction involved during the extraction of zinc from its ore by roasting of zinc ore.

Important Questions on Metals And Non-Metals

HARD

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 15

Give the reaction involved during the extraction of zinc from its ore by calcination of zinc ore.

EASY

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 16

What happens when ZnCO₃ is heated in the absence of oxygen?

EASY

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 16

What happens when a mixture of Cu₂O and Cu₂S is heated?

EASY

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 17

Write chemical equations to show the reactions taking place when: Zinc carbonate is calcined.

EASY

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 17

Write chemical equations to show the reactions taking place when: Carbon dioxide gas is bubbled into lime water for a long time.

HARD

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 1

What is meant by the refining of metals? Describe the electric refining of copper with a neat labelled diagram.

EASY

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 2

Explain how the following metals are obtained from their compounds by the reduction process:
(a) Metal "X", which is low in the reactivity series
(b) Metal "Y", which is in the middle of the series
(c) Metal "Z", which is high up in the reactivity series.

EASY

10th CBSE

IMPORTANT

Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3D>Q 3

What is an alloy? Name the constituents of (i) brass and (ii) bronze. Give one use of bronze specifying the property on which this is based.