All steps are used for the extraction of metals except………….
a) bessemerization
b) roasting
c) smelting
d) evaporation
The metal present in combined state is called
a) mineral
b) metal
c) solid
d) alloy
Urea is probably the most important ……… fertilizer.
a) nitrogenous
b) phosphate
c) organic
d) sulphur
Petroleum is a mixture of many ……………
a) hydrocarbons
b) hydroxide
c) acids
d) salt
Which one is a step of metallurgical process
a) roasting
b) sublimation
c) rusting
d) all of these
The blister form of copper is ……….copper.
a) pure
b) impure
c) refined
d) raw
