1.
Alloys made with mercury as one metal are called?
2.
The number of electrons presents in H+ is
3.
The hardest form of carbon is
5.
Natural rubber is a polymer derived from?
6.
The octane number of zero is assigned to
7.
=The National Chemical Laboratory is situated in
8.
The isotope atoms differ in?
9.
What is metallurgy?
a
process of making metals live long
b
process of creating alloys of metals
c
process of extracting metal in pure form from its ore
10.
Elements that show the properties of both metals and non metals are called?
11.
The most commonly used bleaching agent is
12.
What is the hardest form of carbon?
13.
Conduction band electrons have more mobility than holes because they are
b
need less energy to move them
c
experience collision less frequently
d
experience collision more frequently
14.
Atomic number of an element gives
a
the number of nucleons in its atom
b
the number of electrons in its atom
c
the weight of the atom of the element
d
the total number of elementary particles in its atom
15.
Why is phosphorus kept under water?
c
water forms a protective coating on it
d
to save it from catching fire when exposed to dry air
