Question 9 : Artificial diamond can be produced by quenching----
a solution ofsilicon in lead
a solution of carbon in iron
a solution of carbon in lead
a solution of carbon in tin
Question 10 : Which of these two elements are important components of semiconductors and transistors?
Sn and Pb
Si and Pb
,Ge and Sn
Si and Ge
Question 11 : Which of these is not a form of carbon?
carbon black
carbon hydride
Coke
charcoal
Question 12 : Which of these elements shows polymorphism?
Pb
Sn
Si
C
Comments
Leave a comment