4 the questions please answer them all please
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Answer:
a) true c)true .baki question mujhe samajh nahin aa Raha
Answer:
Ans. 1)Five physical properties of metals are as follows:-
¡) They posses solidness.
¡¡)They have high boiling and melting point.
¡¡¡)They posses malleability and ductility.
¡v)They are good conductors of heat and electricity.
v)They are sonorous.
Ans. 2)Gold is used to make jewellery because of the attractiveness of its luster and because of its rarity. It also doesn't tarnish and doesn't react with air the way a metal like iron does. Therefore, gold is alloyed with other metals to make it stronger.
Ans. 3)Aluminium is commonly used for making cooking utensils because it is cheap, durable, easy to work with and to cast into different shapes, and it's a metal, so it will conduct heat well.
Ans. 4)¡)Mercury is only a metal present in liquid state.
ii) Graphite, phosphorus as black phosphorus, selenium, and iodine posses lusture.
iii) Graphite is a non metal that conduct electricity.
iv) Sodium is a metal that is soft.
v) Solid non metals are brittle and can be broken by applying some stress. Ex., graphite. Exception to this is diamond. Solid non-metals are brittle it means it can be broken when pressure is applied .
Explanation:
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