Top Questions from Metals and Non Metals that can come in the Exams.

Top 10 Chemistry Question that have chances to come in the Exams.

With Solutions.

Spark Team have prepared some of these questions.... 

Notes are below and learn....

Chapter Metals and Non Metals.

Question Type - All

Questions ;

1. Define Displacement Reactions.

Ans) Displacement reactions occur when a metal from the electrochemical series is mixed with the ions of a metal lower down in the electrochemical series. The atoms of the more reactive metal push their electrons on to ions of the less reactive metal.

2. Name the property due to which metals can be beaten into thin sheets.

Ans) Malleability 

3. Why some metals displace other metals from their solution?

Ans) Because of being more reactive than the metals which they displace.

 

4. Classify the following into metals and non-metals:

Copper, iron, graphite, sulphur, aluminium, oxygen.
Answer)
Metals: Copper, Iron, Aluminium.
Non-metals: Graphite, Sulphur, Oxygen.

5.What happens when metals react with water?

Ans) Metals produce their hydroxides or oxides and hydrogen.

6. Name one non-metal and one metal, which are in liquid state at room temperature.

Ans) Bromine is the non–metal and mercury is the metal which is in liquid state at room temperature.

7.  Give reasons for the following

i) Zinc oxide is considered an amphoteric oxide.
ii) Non-metals in general do not displace hydrogen from dilute acids.
iii) Metals conduct electricity.

Ans) i) Zinc oxide is considered an amphoteric oxide because it shows both acidic and basic behaviour.

ii) Non-metals do not react with dilute acids hence do not displace hydrogen from dilute acids.

iii) thatMetals conduct electricity because they contain free electrons which can move easily through the metal and conduct electric current.

8. Identify the following oxides with neutral, acidic, basic and amphoteric oxides ;

i) Al₂O₃ 

ii) MgO 

iii) SO₂ 

iv) CO 

v) Na₂O 

vi) N₂O 

vii) ZnO 

viii) CO₂

 ix) SO₃

 x) CaO.

Answer)
Neutral oxides: CO; N₂O
Acidic oxides: SO₂; CO₂; SO₃
Basic oxides: MgO; Na₂O; CaO
Amphoteric oxides: Al₂O₃ ; ZnO

9. Why is that iron does not occur as a metal in the crust of the earth? What are the common compound forms in which iron occurs? Which of these is more often used for extracting iron? Why are carbon and limestone mixed with iron ore before feeding it into the blast furnace? Write the chemical equations for the reduction step and the slag formation step.

Answer)
Iron is quite reactive and so it does not occur as a metal in the crust of the earth. The common compounds formed are its oxide, a carbonate and a sulphide. The oxide ore of iron called haematite is more often used for extracting iron. The carbon and limestone which is mixed with iron ore is called the charge. This charge is responsible for the formation of iron metal. Coke acts the reducing agent and addition of limestone helps to remove the earthy impurities like sand from the blast furnace by forming fusible slag.
Reduction of Iron(III)oxide or haematite to Iron: carbon monoxide reduces iron(III)oxide to iron metal.

10.Write the name of the compound, when iron is corroded?

Answer)
When iron is corroded rust is formed which is hydrated iron (III) oxide (Fe₂O₃.x.H₂O).

Chemistry Extra Question/Answer.

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