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  • (a) Write chemical equations for the following reactions:     (i) Calcium metal reacts with water.     (ii) Cinnarbar is heated in the presence of air.     (iii) Manganese dioxi

(a) Write chemical equations for the following reactions:

    (i) Calcium metal reacts with water.

    (ii) Cinnarbar is heated in the presence of air.

    (iii) Manganese dioxide is heated with aluminium powder.

(b) What are alloys ? List two properties of alloys.

 

 

 

 
 
 
 
 

Answers (1)

(a)\; (i)\; Ca+2H_{2}O\rightarrow Ca(OH)_{2}+H_{2}

(ii)\; 2HgS+3O_{2}\overset{Heat}{\rightarrow}2HgO+2SO_{2}

        (iii)\;3 MnO_{2}+4Al\rightarrow 2Al_{2}O_{3}+3Mn+Heat

(b) Alloys are the homogeneous mixture of two or more metals or one metal and a non-metal.

Properties \rightarrow The electrical conductivity and melting point of alloys are less than pure metals.

Alloys are more resistant to carrosion.

Posted by

Sumit Saini

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