Identify the compound from the following.
Carbon dioxide
Iron
Hydrogen
Air
A few coloured glass pieces that are big in size are mixed with sugar . The easiest way to separate them is :
heat the mixture
add the mixture of water
handpick the glass pieces
handpick the sugar particles
The heterogeneous mixture of soot particles in air is a mixture of :
solid-in-solid
solid-in-gas
gas-in-solid
gas-in-gas
Pure substances possess :
variable melting points and boiling points
nonuniform composition
variable properties
fixed melting points and boiling points
Mixtures in which components can be distingushed are called :
heterogeneous
homogenous
pure substances
solutions
A coagulant is :
special chemical which helps small fine particles to settle down
which helps the substance to sublime
filtering agent
none of the above
The process by which a solid changes directly into gas is called :
decantation
sublimation
condensation
sedimentation
Sieving can be used only when the components of the mixture have :
different sizes
different melting points
different boiling points
different specific gravities
Identify the mixture from the following.
Oxygen
Pick out the liquid-in-gas type of mixture from the following.
Dissolved carbon dioxide in water
Droplets of water in air
Oxygen dissolved in water
All of the above
