Choose and write the correct answer(MCQs) :

1. Which of the following metals is ductile :
   1. silver
   2. sulphur
   3. silicon
   4. mercury
2. The metal which reacts vigorously with hot water is :
   1. copper
   2. sodium
   3. magnesium
   4. iron
3. Compounds of silicon are :
   1. ethylene dibromide and silver bromide
   2. red phosphorus and white phosphorus 
   3. German silver and magnesium 
   4. silica and sodium silicate
4. Non-metals react with chlorine and form :
   1. hydrides 
   2. basic oxides
   3. chlorides 
   4. acidic oxides 
5. Metals combine with oxygen to form :
   1. basic oxides
   2. hydrides 
   3. acidic oxides
   4. chlorides 

Fills in the blanks.

1. All __________ have certain common physics and chemical properties.
2. __________ wires are used in preparing wire gauzes.
3. Different metals take different time to conduct __________.
4. The chemical reaction between sodium and water produces __________.
5. Zinc and iron react very mildly with __________.
6. _________ are not malleable.
7. Non-metals are generally bad conductors of __________ and ____________.
8. ___________ is a good reflection of heat.
9. __________ is used for absorption of neutrons in nuclear reactors.
10. __________ is used for making skin ointments.

Write T for true or F for false.

1. Metals generally have high melting points.
2. Non-metals can be hammered into sheets.
3. Electric wires made of copper, aluminium and iron.
4. Gallium has low melting point.
5. Copper, silver and nickel react very midly with water.
6. Non-metals have very dull lustre.
7. Graphite is the only non-metal which is a good conductor of heat and electricity.
8. Sulphur with oxygen forms carbon dioxide.
9. Zinc is used in making concave mirrors in astronomical telescopes.
10. Chlorine is used to kill bacteria in drinking water.