Give reasons for the following:
$(i)$ Metals conduct electricity.
$(ii)$ Non-metals in general do not displace hydrogen from dilute acids.
$(iii)$ Aluminium easily combines with oxygen but still it can be used for making kitchen utensils.
$(i)$ Metals conduct electricity.
$(ii)$ Non-metals in general do not displace hydrogen from dilute acids.
$(iii)$ Aluminium easily combines with oxygen but still it can be used for making kitchen utensils.
(N/A) $(i)$ Metals contain free electrons that can move throughout the metallic lattice,allowing them to conduct electricity.
$(ii)$ Non-metals are electron acceptors. To displace hydrogen from dilute acids,electrons must be supplied to the $H^+$ ions of the acid. Since non-metals cannot donate electrons,they cannot displace hydrogen.
$(iii)$ Aluminium reacts with oxygen to form a thin,protective layer of aluminium oxide $(Al_2O_3)$ on its surface. This layer is non-reactive and prevents further oxidation of the underlying metal,making it suitable for kitchen utensils.
$(ii)$ Non-metals are electron acceptors. To displace hydrogen from dilute acids,electrons must be supplied to the $H^+$ ions of the acid. Since non-metals cannot donate electrons,they cannot displace hydrogen.
$(iii)$ Aluminium reacts with oxygen to form a thin,protective layer of aluminium oxide $(Al_2O_3)$ on its surface. This layer is non-reactive and prevents further oxidation of the underlying metal,making it suitable for kitchen utensils.
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$(a)$ Write the chemical name of the coating that forms on silver and copper articles when these are left exposed to moist air.
$(b)$ Explain what is galvanisation? What purpose is served by it?
$(c)$ Define an alloy. How are alloys prepared? How do the properties of iron change when:
$(i)$ small quantity of carbon,
$(ii)$ nickel and chromium are mixed with it.
$(b)$ Explain what is galvanisation? What purpose is served by it?
$(c)$ Define an alloy. How are alloys prepared? How do the properties of iron change when:
$(i)$ small quantity of carbon,
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View SolutionSamples of four metals $A$,$B$,$C$ and $D$ were taken and added to the following solutions one by one. The results obtained have been tabulated as follows.
Metal Iron $(II)$ sulphate Copper $(II)$ sulphate Zinc sulphate Silver nitrate $A$ No reaction Displacement No reaction Displacement $B$ Displacement Displacement No reaction Displacement $C$ No reaction No reaction No reaction Displacement $D$ No reaction No reaction No reaction No reaction
Use the table above to answer the following questions about metals $A$,$B$,$C$ and $D$:
$(i)$ Which is the most reactive metal?
$(ii)$ What would you observe if $B$ is added to a solution of Copper $(II)$ sulphate?
$(iii)$ Arrange the metals $A$,$B$,$C$ and $D$ in the order of decreasing reactivity.
| Metal | Iron $(II)$ sulphate | Copper $(II)$ sulphate | Zinc sulphate | Silver nitrate |
| $A$ | No reaction | Displacement | No reaction | Displacement |
| $B$ | Displacement | Displacement | No reaction | Displacement |
| $C$ | No reaction | No reaction | No reaction | Displacement |
| $D$ | No reaction | No reaction | No reaction | No reaction |
Use the table above to answer the following questions about metals $A$,$B$,$C$ and $D$:
$(i)$ Which is the most reactive metal?
$(ii)$ What would you observe if $B$ is added to a solution of Copper $(II)$ sulphate?
$(iii)$ Arrange the metals $A$,$B$,$C$ and $D$ in the order of decreasing reactivity.
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View Solution$A, B$ and $C$ are three elements which undergo chemical reactions according to the following equations:
$A_{2}O_{3} + 2B \rightarrow B_{2}O_{3} + 2A$
$3CSO_{4} + 2B \rightarrow B_{2}(SO_{4})_{3} + 3C$
$3CO + 2A \rightarrow A_{2}O_{3} + 3C$
Answer the following questions with reasons:
$(a)$ Which element is the most reactive?
$(b)$ Which element is the least reactive?
$(c)$ What is the type of reactions listed above?
$A_{2}O_{3} + 2B \rightarrow B_{2}O_{3} + 2A$
$3CSO_{4} + 2B \rightarrow B_{2}(SO_{4})_{3} + 3C$
$3CO + 2A \rightarrow A_{2}O_{3} + 3C$
Answer the following questions with reasons:
$(a)$ Which element is the most reactive?
$(b)$ Which element is the least reactive?
$(c)$ What is the type of reactions listed above?
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