4) What are the advantages of using manures?
5) Give reason for the following:
a) The electric wires are made of copper,
b) Gold and silver are used for making jewellery,
6) Could we store lemon pickle in an aluminium container?
7) a) Name the property becuase of which strings in guitar have to be of
metal.
b) What happen when non-metal like phosphorus react with oxygen,
8) Name two metal which is highly unreactive.
Answers
Hi Mate,
4) advantages of using manures are:
(i) they have all the nutrients which soil requires.
(ii) doesn't cause acid rain.
(iii) doesn't have any chemicles / it is made with natural substances like cow dung, leaves, wood,etc..
5) (a) The electric wires are made of copper because correct are the best conductor of electricity.
(b) Gold and silver are used for making jewellery because gold and silver are metals, have luster, and doesn't react with air.
6) No, we cannot store lemon pickle in an aluminium container because lemon and also it's pickle has some juices which reacts with aluminium.necause of this we cannot store lemon pickle in an aluminium container.
7) (a) because of which strings in guitar have to be of metals as metal trains have taken the foundation of strength for the electric guitar and bass.
(b) nonnon metal reacts with oxygen when exposed to air. phosphorus is a non metals when it is exposed in air, it releases hydrogen and salt.
8) The two metal which is highly unreactive:
(i) Gold
(ii) silver
(iii) copper {extra option for you}
Hope This Helps You........(◕ᴗ◕✿)