Question

1 . Define the term ‘ore’.

Give ONE example of the ore of the following metals:

a. Iron
b. Calcium
c. Aluminium

2 . Give reason for the followings statement:

a. All minerals are not ores but all ores are minerals.

3. Differentiate between metal and non-metal on the basis of the type of ions they form.

4. What is meant by the term ‘metallurgy?

5. Write the important steps involved in the process of metallurgy.

6. How can we classify elements on the basis of similarities and differences in their properties?

7. What are metalloids? Give two examples.​

Answer 1

✤ Given Question ✤

1 . Define the term ‘ore’.

Give ONE example of the ore of the following metals:

a. Iron

b. Calcium

c. Aluminium

✤ Required Answer ✤

An ore is a naturally occurring mineral from which one or metals can be extracted easily and profitably.

a. Iron - Haemitite

b. Calcium - limestone

c. Aluminium - Bauxite $\green{\bigstar}$

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✤ Given Question ✤

2 . Give reason for the followings statement:

a. All minerals are not ores but all ores are minerals.

✤ Required Answer ✤

All minerals are not ores but all ores are minerals as some of them might have a large amount of unwanted substance like - sand , stones and other impurities . $\purple{\bigstar}$

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✤ Given Question ✤

3. Differentiate between metal and non-metal on the basis of the type of ions they form.

✤ Required Answer ✤

Metals - Elements which loose electrons from their outermost shell to form positive ions or cations are called metals.

ex - Sodium , iron , calcium etc .

Non metals - Elements which gain electrons to form negative ions or anions are called non metals.

ex - sulphur, oxygen , nitrogen etc. $\orange{\bigstar}$

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✤ Given Question ✤

4. What is meant by the term ‘metallurgy?

✤ Required Answer ✤

Metullurgy : It is the science of extracting metals from their ores and purifying them . $\blue{\bigstar}$

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✤ Given Question ✤

5. Write the important steps involved in the process of metallurgy.

✤ Required Answer ✤

It can described in four main steps :-

◍ Crushing or grinding of the ore

◍ Concentration of the ore: It is the first step in which impurities(Gangue or matrix) are removed from the ore and it gets concentrated.

◍ Reduction : The metal compounds are reduced to get free metal .

◍ Refining of metal : The metal is purified and some substances are added to get desired properties . $\red{\bigstar}$

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✤ Given Question ✤

6. How can we classify elements on the basis of similarities and differences in their properties?

✤ Required Answer ✤

we can classify elements on the basis of similarities and differences in their properties by metals , non metals and metalloids or semi - metals .$\blue{\bigstar}$

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✤ Given Question ✤

7. What are metalloids? Give two examples.

✤ Required Answer ✤

elements neither fit with metal nor with non metals are categorised as metalloids or semi - metals .

ex - Germanium , arsenic etc . $\pink{\bigstar}$