Is Matter Around Us Pure?
Q:15
Which of the following gas is colourless, odourless and combustible-
(a) Carbondioxide
(b) Hydrogen
(c) Nitrogen
(d) Helium.
Ans-
The gas that is colorless, odorless, and combustible is (b) Hydrogen.
B. Fill in the blanks : Mark :1
(i) Sodium chloride can be separated from aqueous solution of sodium
chloride by________________method.
(ii) Evaporation of water is ___________change
(iii) A solution of sugar in water is a_________mixture
(iv) In gel, dispersed phase is__________and dispersion medium is__________.
(v) In sol dispersed phase is____________________and dispersion medium is__________.
(vi) The pigment particles present in black ink can be separated by __________method.
(vii) The scattering of light rays by colloidal particles is called_____________.
(viii) Solution of solid iodine in alcohol is known as____________________.
(ix) Mixing of more than one pure substances forms a______________.
Ans-
(i) Sodium chloride can be separated from an aqueous solution of sodium chloride by evaporation method.
(ii) Evaporation of water is a physical change.
(iii) A solution of sugar in water is a homogeneous mixture.
(iv) In gel, dispersed phase is a solid and dispersion medium is a liquid.
(v) In sol, dispersed phase is solid, liquid, or gas, and dispersion medium is a liquid.
(vi) The pigment particles present in black ink can be separated by chromatography method.
(vii) The scattering of light rays by colloidal particles is called Tyndall effect.
(viii) Solution of solid iodine in alcohol is known as tincture of iodine.
(ix) Mixing of more than one pure substances forms a mixture.
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