Give appropriate scientific reasons for the following statements: 1.

1.	Give appropriate scientific reasons for the following statements: 1. Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be reduced by a reducing agent. 2. Carbon tetrachloride does not conduct electricity. 3. During electrolysis of molten lead bromide graphite anode is preferred to other electrodes. 4. The electrical conductivity of acetic acid is less in comparison to the electrical conductivity of dilute sulphuric acid at a given concentration.5. Electrolysis of molten lead bromide is considered to be a redox reaction.
Answer» 1. Zinc is comparatively less reactive. So its oxideis less stable and hence it can be reduced by reducing agent whereas Aluminium is very reactive due to which its oxide is quite stable and it can not be reduced by a reducing agent it can be reduced only by electrolytic reduction. 2. Carbon tetrachloride is a non polar covalent compound and so do not have free ions therefore they do not conduct electricity. 3. Graphite is an inert electrode which is preferred in electrolysis of molten lead bromide because if other active electrodes are used then bromine will react with them. 4. Acetic acid is a weak acid and has less number ions so conductivity is less whereas dil. sulphuric acid is a strong acid, has more number of ions and thererfore its electrical conductivity is more. 5. During electrolysis of molten lead bromide lead gets oxidised and bromine gets reduced. Thus both oxidation and reduction occur simultaneously. So it is a redox reaction.

Give appropriate scientific reasons for the following statements: 1. Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be reduced by a reducing agent. 2. Carbon tetrachloride does not conduct electricity. 3. During electrolysis of molten lead bromide graphite anode is preferred to other electrodes. 4. The electrical conductivity of acetic acid is less in comparison to the electrical conductivity of dilute sulphuric acid at a given concentration.5. Electrolysis of molten lead bromide is considered to be a redox reaction.

Answer»

1. Zinc is comparatively less reactive. So its oxideis less stable and hence it can be reduced by reducing agent whereas Aluminium is very reactive due to which its oxide is quite stable and it can not be reduced by a reducing agent it can be reduced only by electrolytic reduction.

2. Carbon tetrachloride is a non polar covalent compound and so do not have free ions therefore they do not conduct electricity.

3. Graphite is an inert electrode which is preferred in electrolysis of molten lead bromide because if other active electrodes are used then bromine will react with them.

4. Acetic acid is a weak acid and has less number ions so conductivity is less whereas dil. sulphuric acid is a strong acid, has more number of ions and thererfore its electrical conductivity is more.

5. During electrolysis of molten lead bromide lead gets oxidised and bromine gets reduced. Thus both oxidation and reduction occur simultaneously. So it is a redox reaction.

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