Chemistry
Write true or false against the following statements .
(a) The elements present in a compound can be obtained by simple physical methods.
(b) The properties of components are retained in a mixture.
(c) Common salt is separated from sea water by evaporation.
(d) A mixture has a definite chemical formula.
Elements, Compounds & Mixtures
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Answer
(a) False
Correct Statement — The elements present in a compound cannot be obtained by simple physical methods.
(b) True
(c) True
(d) False
Correct Statement — A mixture has no definite chemical formula.
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Related Questions
Assertion (A): Chromatography is the latest technique to separate the components of a mixture when all the components are different in their properties.
Reason (R): Components of ink are separated by chromatography.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Fill in the blanks:
(a) Brass is a solid-solid …………… mixture.
(b) The method used to separate sawdust and sand is …………… .
(c) Kerosene oil and water are …………… liquids.
(d) Atomicity is the number of atoms in a molecule of …………… .
Match the following columns.
Column A Column B (a) Solid + Liquid mixture (i) Krypton (b) Filtration (ii) Pure substance (c) Chromatography (iii) Salt and water (d) Compounds (iv) Residue (e) Inert gas (v) Components of ink Classify the following substances into compounds and mixtures:
Carbon dioxide, air, water, milk, common salt, blood, fruit juice, iron sulphide, brass.