which of the following is an example of a mixture? 1 oil water 2iron powder 3 sodium chloride 4 given all
Answers
Answer:
What is meant by a substance?
Ans. A pure substance consists of a single type of particles.
Q2. List the points of differences between homogeneous and heterogeneous mixtures.
Ans.
Suspension Solvent
(i) It has uniform compos ition. It does not have a uniform compos ition.
(ii) No vis ible boundaries of s eparation. Shows vis ible boundaries of separation.
(iii) They cons is t of only one phase. They cons is t of more than one phase.
Example: sugar + water
→ sugar s olution. Example: s ugar + s and
NCERT TEXTBOOK PAGE 18
Q1. Differentiate between homogeneous and heterogeneous mixtures with examples.
Ans. Same as Q2 above.
Q2. How are sol, solution and suspension different from each other?
Ans.
Sol. (colloid) Solution Suspension
• Size of solute partic les between 1 nm to 100 nm. Siz e of solute partic les less than 1 nm (10-9m) Size of s olute partic les is more than 100 nm.
• It is stable. Stable. Unstable.
• It scatters a beam of light. It does not sc atter light. It s catters a beam of light.
• Solute partic les pass through filter paper. Solute partic les passthrough filter paper. Solute particles do not pass through filter paper.
Q3. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Ans. Mass of solute (sodium chloride) = 36 g
Mass of solvent (water) = 100 g
Mass of solution
= Mass of solute + Mass of solvent
= 36 g + 100 g = 136 g
Answer:
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