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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. They are solids at room temperature, except mercury which is a liquid. They can form positive ions by losing electrons to non-metals. Metals combine with oxygen to form basic oxides. Different metals have different reactivities with water and dilute acids. Metals above hydrogen in the Activity series can displace hydrogen from dilute acids. A more reactive metal displaces a less reactive metal from its salt solution. Metals occur in nature as free elements or in the form of their compounds. The extraction of metals from their ores and then refining them for use is known as metallurgy. The surface of some metals, such as iron, is corroded when they are exposed to moist air for a long period of time. This phenomenon is known as corrosion.

Non-metals have properties opposite to that of metals. They are neither malleable nor ductile. They are bad conductors of heat and electricity, except for graphite, which conducts electricity.

 

(i) Which of the following pairs will give displacement reactions
1 MgCl2 solution and aluminium metal  
2 NaCl solution and copper metal  
3 FeSO4 solution and silver metal  
4 AgNO3 solution and copper metal  

Ans.

(4)