Question

METALS AND NON-METALS
30. Name a non-metal having a very high melting point.
31. Which property of graphite is utilised in making electrodes
32. Name two non-metals which are both brittle and non-duc
33. Explain why, the surface of some metals acquires a dull a
34. Complete and balance the following equations :
O
(b) Na,
HO
Red heat
(c) Fe(s)
HO (g)
(d) Cu(NO3)2 (aq)
Zn (s)
35. Fill in the following blanks with suitable words:
(a) Na
+
+
+​

Answer 1

Answer:

Explanation:

1.Diamond an allotrope of carbon is a non-metal having a very high melting point.

2. I don't know the answer.

3. Two non-metals which are both brittle and non ductile are Sulphur and phosphorus.

4.The surface of some metals acquires a dull appearance when exposed to air for a long time because metals from a thin layer of oxides, carbonates or sulphide on their surface by the slow action of various gases present in the air that make the dull appearance.

5. Sorry I don't know

Answer 2

non-metals are dull except few such as graphite and iodine. In the case of iodine, when it is present in the presence of light, the electron present in it gets excited by the heat energy of the light.