or
VI. Answer briefly.
1. Which of the following are pure substances?
Ice, Milk, Iron, Hydrochloric acid, Mercury
Brick and Water.
2. Oxygen is very essential for us to live. It
forms 21% of air by volume. Is it an element
or compound?O2gen B celoment
3. You have just won a medal made of 22-carat
gold. Have you just procured a pure
substance or impure substance?
4. How will you separate a mixture containing
saw dust, naphthalene and iron filings?
How are homogenous solutions different
from heterogeneous solution? Explain with
examples.
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Answer:
1.ice, iron , HCl, calcium oxide, mercury.
2.element
3.22 carat gold is soft gold when copper get mixed each other so it is impurity
4.filtration
homogeneous mixture-it is a mixture were the solute particles dissolve in solvent.(uniform composition)
ex-sugar in water.
heterogeneous mixture- it is a mixture were the solute particles do not dissolve but remain suspended throughout.( non- uniform composition).
ex-sand and salt
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