Question

(a) Define non-metals. Give five examples of non-metals.
(b) Name a non-metal which conducts electricity.
(c) Name a non-metal having lustre (shining surface).
(d) Name a non-metal which is extremely hard.
(e) How do non-metals react with oxygen ? Explain with an example. Give equation of the reaction involved. What is the nature of the product formed ? How will you demonstrate it ?

Lakhmir Singh Chemistry Class 10

Answer 1

answer a the non metals are display a variety of colours and they are poor conductors of heat and electricity and they are not lustrous sonorous or malleable example of non metals are hydrogen oxygen carbon etc answer of b ismetal which conduct electricity is bromine answer of D is coal

Answer 2

Answer:

(a) Non-metals are the elements which form negative ions by accepting or gaining electrons. Non-metals usually have 4, 5, 6 or 7 electrons in their outermost shell.

Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity. They are mostly gases and sometimes liquid. Some they are even solid at room temperatures like Carbon, sulfur and phosphorus.

For example-Hydrogen, hydrogen, chlorine, fluorine, carbon, nitrogen, arsenic, phosphorus, selenium are examples of non-metal.

(b) Graphite.

Graphite

Graphite is a non-metal and it is the only non-metal that can conduct electricity. You can find non-metals on the right side of the periodic table and graphite is the only non-metal that is a good conductor of electricity.

(c) Iodine.

Iodine

Iodine is the non-metal which has a shining surface.

(d) Diamond

diamond

Sulphur and graphite are soft non-metals, chlorine is gas while diamond is the hardest known non-metal which is an allotrope of carbon. It has the highest value of hardness on Moh's scale.

(e) Non-metals react with oxygen to form acidic or neutral oxides. The oxide is covalent in nature as it is formed by the sharing of electrons. ... The product formed is acidic in nature. It can be demonstrated by dissolving carbon dioxide in water to form carbonic acid.

Explanation:

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