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24)sodium and potassium are two metals which reacts violently in water. When they are dipped in water violent explosions takes place and their respective hydroxides are formed
12)a) power=voltage*current
=5V*0.001A
=0.005 watts
b) resistance =voltage/current
=5V/0.001
=5000ohm
C) a) tungsten
b) because of its high melting point and high resistance it is used as a filament material
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