Identify the mixture from the following
Carbon dioxide
Iron
Hydrogen
Air
To separate a mixture of two or more gases ______ method is used
Sedimentation
Liquification
Distillation
Decantation
Pure substances possess
Variable melting points and boiling points
Nonuniform
Variable properties
Fixed melting points and boiling points
A pure substance is made up of
Only one kind of molecules
Two or more kinds of molecules
Different types of molecules
None
You can use decantation to separate
Two miscible liquids
Two immiscible liquids
Two metals in an alloy
Solid- solid water
Some iron fillings are mixed with sand. We can separate thm using magnetic separation method. This method is applicable only when
Magnetic substances are mixed up with non magnetic substances
Magnetic substances are mixed up with magnetic substances
Magnetic substances are heated beyond their curie temperatures
Two magnetic substances have equal melting points
Which of the following is not a homogenous mixture/
sugar solution
salt solution
iron fillings in sand
none of these
A compound has
Only one kind of atom
Only one kind of element
A mixture of elements and molecules
Winnowing is useful only when
Two solids have different melting points
Two solids have different boiling points
Two solids have different magnetic properties
Two solids have different weights
Which of the following mixtures will be the most difficult to separate ?
Iron filings + sand
Sand + water
Saw dust + stones
Nitrogen + hydrogen
