Available Answers

1. 1.

   Fill in the blank spaces by choosing the correct words from the is given belong :

   List : acidic, cations, non-metal, malleable, mineral

   1. Metals are generally ____________ and ductile.
   2. Graphite is a ____________, yet it conducts electricity.
   3. Metals form ____________ by losing electrons from their valence shell.
   4. Non-metals do not react with dilute ____________ acids.
   5. Oxides of non-metals are ____________ or neutral in nature.
2. 2.

   Statements given below are incorrect. Write the correct statements.

   1. Non-metals form cations by gaining electron(s) in their valence shell.
   2. Sodium metals reacts, only with hot water to form sodium hydroxide and hydrogen gas.
   3. Calcium and magnesium are called alkali metals.
   4. All oxides of metals are acidic in nature.
   5. Calcium metal catches fire when dropped in a trough of water.
3. 3.

   Match the statements in Column A, with those in Column B.

   Column A	Column B
   1. A metal which floats on the surface of water and catches fire.	(a) Nickel
   2. An alkaline earth metal.	(b) Copper
   3. A self-protecting metal from rusting.	(c) Sodium
   4. A non-metal which is good conductor of electricity and heat.	(d) Calcium
   5. A metal whose oxide is of black colour.	(e) Graphite

    

4. 4.

   State whether the following statements are true or false :

   1. Non-metals form acidic or neutral oxides.
   2. Zinc metal is highly tensile.
   3. Mercury and gallium are liquid metals.
   4. Oxygen constitutes 50% of all the elements present on planet earth.
   5. lodine being a non-metal has lustre.
5. 5.

   Tick (√) the most appropriate answer.

   1. The property due to which metals can be beaten into sheets is called :
      1. ductility
      2. tenacity
      3. malleability
      4. porosity
   2. A non-metal which is a good conductor of heat and electricity is :
      1. phosphorus
      2. silicon
      3. graphite
      4. sulphur
   3. The oxide of sodium is of :
      1. acidic nature
      2. neutral nature
      3. amphoteric nature
      4. basic nature
   4. Sulphur dioxide gas formed by burning of sulphur and oxygen is a/an :
      1. amphoteric oxide
      2. acidic oxide
      3. basic oxide
      4. neutral oxide
   5. Metals more active than hydrogen, react with dilute mineral acids and displace :
      1. hydrogen gas
      2. nitrogen gas
      3. carbon monoxide gas
      4. oxygen gas
6. 6.

   Compare the physical properties of metals and non-metals with respect to the following :

   1. conduction of heat and electricity
   2. malleability
   3. ductility
   4. boiling point
   5. lustre