(a) (i) No change will be on dry Litmus paper. (ii) The gas is sulphur dioxide (SO2), which turns moist blue litmus paper to red because sulphur dioxide reacts with moisture to form sulphurous acid. (b) S(s) + O2(g) → SO2(g) Sodium dioxide SO2(g) + H2O(f) → H2SO3(aq) Sulphurous acid
(a) (i) No change will be on dry Litmus paper.
(ii) The gas is sulphur dioxide (SO2), which turns moist blue litmus paper to red because sulphur dioxide reacts with moisture to form sulphurous acid.
It is easier to reduce a metal oxide into free metal. Since it is easier to obtain metals from their oxides than from their carbonates or sulphides directly, therefore, the carbonate and sulphide ores are first converted to oxides for extracting the metals.
It is easier to reduce a metal oxide into free metal. Since it is easier to obtain metals from their oxides than from their carbonates or sulphides directly, therefore, the carbonate and sulphide ores are first converted to oxides for extracting the metals.
Aluminium forms a non-reactive layer of aluminium oxide on its surface. This layer prevents aluminium to react with other substances. That’s why aluminium is used to make cooking utensils.
Aluminium forms a non-reactive layer of aluminium oxide on its surface. This layer prevents aluminium to react with other substances. That’s why aluminium is used to make cooking utensils.
Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.
(a) (i) No change will be on dry Litmus paper. (ii) The gas is sulphur dioxide (SO2), which turns moist blue litmus paper to red because sulphur dioxide reacts with moisture to form sulphurous acid. (b) S(s) + O2(g) → SO2(g) Sodium dioxide SO2(g) + H2O(f) → H2SO3(aq) Sulphurous acid
(a) (i) No change will be on dry Litmus paper.
(ii) The gas is sulphur dioxide (SO2), which turns moist blue litmus paper to red because sulphur dioxide reacts with moisture to form sulphurous acid.
(b) S(s) + O2(g) → SO2(g)
Sodium dioxide
SO2(g) + H2O(f) → H2SO3(aq)
Sulphurous acid
State two ways to prevent the rusting of iron.
Ways to prevent rusting of iron are : (a) By painting (b) By galvanizing
Ways to prevent rusting of iron are :
See less(a) By painting
(b) By galvanizing
What type of oxides are formed when non-metals combine with oxygen?
Non-metals when combine with oxygen form acidic oxides. For example: S(s) + O2(g) → SO2(g) (Acidic in nature)
Non-metals when combine with oxygen form acidic oxides.
For example:
S(s) + O2(g) → SO2(g)
(Acidic in nature)
Give reasons: Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
It is easier to reduce a metal oxide into free metal. Since it is easier to obtain metals from their oxides than from their carbonates or sulphides directly, therefore, the carbonate and sulphide ores are first converted to oxides for extracting the metals.
It is easier to reduce a metal oxide into free metal. Since it is easier to obtain metals from their oxides than from their carbonates or sulphides directly, therefore, the carbonate and sulphide ores are first converted to oxides for extracting the metals.
See lessGive reasons: Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Aluminium forms a non-reactive layer of aluminium oxide on its surface. This layer prevents aluminium to react with other substances. That’s why aluminium is used to make cooking utensils.
Aluminium forms a non-reactive layer of aluminium oxide on its surface. This layer prevents aluminium to react with other substances. That’s why aluminium is used to make cooking utensils.
See less