Which is not an amorphous solid ?
a) rubber
b) NaCl
c) plastics
d) glass
….……. concentrations of salt are required to kill unwanted bacteria.
a) 20%
b) 30%
c) 40%
d) 80%
The existence of an element in more than one crystalline forms is called ………
a) catenation
b) isomerism
c) allotropy
d) carbocation
Allotropes of an element always show different ……….. properties
a) physical
b) chemical
c) a & b both
d) none of these
Oxygen’s allotropEs are ……….
a) O2
b) O8
c) O3
d) a & c both
Carbon is found in diamond in ……… form
a) tetrahedral
b) octahedral
c) hexagonal
d) cubic
