Q 3121123021.     (i) Complete the missing statements:
Metals are while non-metals are poor conductor of heat. Metals are
malleable while non-metals are . Metals form positive ions while
non-metals form . Non-metals form acidic oxides while metals form
(ii) Name: (a) The metal which is liquid at room temperature. (b) The allotrope of the non-metal
carbon which conducts electricity. How many valence electrons are present in (c) metals (d) nonmetals.
(iii) What metallic property is shown by the non-metal graphite?
(iv) X is an element in the form of a powder. X burns in oxygen and the product is soluble in water.
The solution is tested with litmus. Write down the word only which will correctly complete each
of the following:
(a) I f X is a metal, then the litmus will turn --------· If X is non-metal, then the
litmus will turn _______ (b) If X is a reactive metal, then __ will be evolved when X reacts with dilute
sulphuric acid.
(c) If X is a metal it will form __ oxide, which will form--------
solution with water.
(d) If X is a non-metal it will not conduct electricity unless it is carbon in the form of ________
(v) Compare the properties of a typical metal and a non-metal on the basis of the following:
(a) Electronic configuration
(b) Oxidizing or reducing action
(c) Nature of the oxides
(d) Conductivity of heat and electricity.
(vi) Name:
(a) A non-metal that has a metallic lustre and sublimes on heating.
(b) An allotrope of a non-metal that allows electricity to pass through it.