The gas evolved when zinc reacts with dilute sulphuric acid is :
colourless, odourless, burns with a pop sound
colourless, foul smelling, burns with a pop sound
colourless, pungent smelling, burns with a pop sound
brown coloured, pungent smelling, does not burn
It has variable composition.
Element
Mixture
Solution
Compound
Mist is an example of
Solid sol
Foam
Gel
Aerosol
When we burn a cleaned piece of magnesium ribbon in air, we observe :
a white dazzling light while burning
a white residue left after burning
a black residue left after burning
(1) and (2)
Non-uniform composition is for
Homogeneous mixture
Heterogeneous mixture
Solutions
It is constituted by more than one kind of pure form of matter.
Substance
When we heat a mixture of iron and sulphur for a short time and then move a magnet over it, the observation made is :
iron gets attracted
sulphur gets attracted
iron and sulphur both get attracted
iron, sulphur as well as the product formed all get attracted
A process that separates a pure solid in the form of its crystals from a solution is called
Crystallisation
Condensation
Evaporation
Distillation
The technique used to separate pigments from natural colours.
Separating funnel
Chromatographic
