Materials: Metals and non-metals Worksheet-9

Materials: Metals and non-metals Worksheet-9

 

  1. Match the substances given in Column I with their uses given in Column II.

 

True / False:

  1. Sodium is a very reactive metal.

 

  1. Copper displaces zinc from zinc sulphate solution.

 

  1. Magnesium reacts with cold water.

 

  1. All metals exist in solid state at room temperature.

 

  1. Gallium has a low melting point.

 

  1. Gold is alloyed with copper to make it hard.

 

Answer:

  1. A–S, B–T, C–R , D–U, E–Q, F–P

 

  1. True

 

  1. False

Explanation: Copper is less reactive than zinc hence it cannot displace zinc from zinc sulphate solution.

 

  1. False

Explanation: Magnesium reacts with boiling water or steam.

 

  1. False

Explanation: Mercury exists in liquid state at room temperature.

 

  1. True

Explanation: The melting point of gallium is so low that it melts in the palm of hand. (Ga M.p. 300C)

 

  1. True