Question

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

Answer 1

a solution of carbon in iron

Si and Ge

carbon hydride

C