Metals and Non-Metals Science - Metals and Non-Metals

Stainless steel is very useful material for our life. In stainless steel, iron is mixed with:

During electrolytic refining of zinc, it gets:

Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

Which one of the following properties is not generally exhibited by ionic compounds?

1. Solubility in water.
2. Electrical conductivity in solid state.
3. High melting and boiling points.
4. Electrical conductivity in molten state.

Which one of the following metals do not react with cold as well as hot water?

1. Na.
2. Ca.
3. Mg.
4. Fe.

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

1. Mg
2. Ag
3. Zn
4. Cu

Which one of the following figures correctly describes the process of electrolytic refining?

 

Which of the following property is generally not shown by metals?

1. Electrical conduction.
2. Sonorous in nature.
3. Dullness.
4. Ductility.

An element forms an oxide A₂O₃ which is acidic in nature. Identify A as a metal or non-metal.

Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310K (37°C).

A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M and black coloured product and also explain the reaction of M with oxygen.

Give two examples each of the metals that are good conductors and poor conductors of heat respectively.

What happens when.

1. ZnCO₃ is heated in the absence of oxygen?
2. A mixture of Cu₂O and Cu₂S is heated?

What are the constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires?

The following reaction takes place when aluminium powder is heated with MnO₂.
3MnO₂(s) + 4Al(s) → 3Mn(l) + 2Al₂O₃(l) + Heat

1. Is aluminium getting reduced?
2. Is MnO₂ getting oxidised?

Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310K (37°C).

Give two examples each of the metals that are good conductors and poor conductors of heat respectively.

Of the three metals X, Y and Z. X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

A metal A, which is used in thermite process, when heated with oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with HCl and NaOH.

Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.

Two ores A and B were taken. On heating ore A gives CO₂ whereas, ore B gives SO₂. What steps will you take to convert them into metals?

Of the three metals X, Y and Z. X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.

Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.

1. Given below are the steps for extraction of copper from its ore. Write the reaction involved.
   1. Roasting of copper (1) sulphide.
   2. Reduction of copper (1) oxide with copper (1) sulphide.
   3. Electrolytic refining.
2. Draw a neat and well labelled diagram for electrolytic refining of copper.

Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.

Explain the following.

1. Reactivity of Al decreases if it is dipped in HNO₃.
2. Carbon cannot reduce the oxides of Na or Mg.
3. NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state.
4. Iron articles are galvanised.
5. Metals like Na, K, Ca and Mg are never found in their free state in nature.

A non-metal A which is the largest constituent of air, when heated with H₂ in 1 : 3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O₂ it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D which acts as a strong oxidising agent.

1. Identify A, B, C and D.
2. To which group of periodic table does this non-metal belong?