Give reasons : Carbonate and sulphide ores are usually converted into oxides during process of

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3. Metals and Non-metals

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Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Option A

Option B

Option C

Option D

Solution

Carbonate and sulphide ores are usually converted into oxides during the process of extraction because metals can be easily extracted from their oxides rather than from their carbonates and sulphides.

Standard 10

Science

Metallic oxides of zinc, magnesium and copper were heated with the following metals.

Metal Zinc Magnesium Copper

Zinc oxide – – –

Magnesium oxide – – –

Copper oxide – – –

In which cases will you find displacement reactions taking place ?

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Give reasons : Sodium, potassium and lithium are stored under oil.

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Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

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Give reasons : Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.

medium

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

medium

Metal	Zinc	Magnesium	Copper
Zinc oxide	–	–	–
Magnesium oxide	–	–	–
Copper oxide	–	–	–

Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Solution

Similar Questions

Metallic oxides of zinc, magnesium and copper were heated with the following metals. Metal Zinc Magnesium Copper Zinc oxide – – – Magnesium oxide – – – Copper oxide – – – In which cases will you find displacement reactions taking place ?

Give reasons : Sodium, potassium and lithium are stored under oil.

Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Give reasons : Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.

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Metallic oxides of zinc, magnesium and copper were heated with the following metals.

Metal Zinc Magnesium Copper

Zinc oxide – – –

Magnesium oxide – – –

Copper oxide – – –

In which cases will you find displacement reactions taking place ?