Question

A. Fill in the blanks : (1/2x4)
i) Atomicity of S8 molecule is _______.
ii) Germanium is used in ________ fibres.
iii) Antimony is used as an n- type ________ for silicon.
iv) __________ is the hardest allotropic form of carbon.

B. State True or False : (1/2x4)
i) All nonmetals are soft.
ii) Impure metals corrode.
iii) Lead is used in protective screen of X-ray machines.
iv) Silicon is alloyed with aluminum for automotive parts.

C. Identify the following: ( 1 x 2 )
i) I am used for making anchors, wire ropes, bolts.
ii) I am alloyed with germanium to form high speed Integrated Circuits.

D. Explain the following terms : ( 2 x 4)
i) Allotropy ii) Malleability iii) Metalloids iv) Sonority

E. Give one reason why : (1 x 3)
i) Copper is used in making cooking utensils.
ii) Usually nonmetals can be easily broken.
iii) Zinc is used to galvanize iron sheets.

F. i) What is Rusting? State the chemical formula of rust. (1½)
ii) State three ways to prevent rust.​

Answer 1

Answer:

these is very jumble that why I can answer