Advertisements
Advertisements
प्रश्न
Arun has prepared a 0.01% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?
विकल्प
1.00 g of NaCl + 100g of water
0.11g of NaCl + 100g of water
0.0l g of NaCl + 99.99g of water
0.10 g of NaCl + 99.90g of water
Advertisements
उत्तर
0.0l g of NaCl + 99.99g of water
Explanation:
Mass % = `(Mass of solute)/(Mass of solute + Mass of solvent) xx 100`
(a) Mass percentage = `1.00/(1.0 + 100 xx 100)`
= 0.99
(b) Mass percentage = `0.11/(0.11 + 100) xx 100`
= 0.1098
(c) Mass percentage = `0.01/(0.01 + 99.99) xx 100`
= 0.01
(d) Mass percentage = `0.10/(0.10 + 99.90) xx 100`
= 0.1
APPEARS IN
संबंधित प्रश्न
Write the steps you would use for making tea. Use the words: solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
The component present in a lesser amount, in a solution, is called ______
Give an example of a solid in a liquid.
Give an example of gas in gas.
The teacher instructed three students ‘A’, ‘B’ and ‘C’ respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). ‘A’ dissolved 50g of NaOH in 100 mL of water, ‘B’ dissolved 50g of NaOH in 100g of water while ‘C’ dissolved 50g of NaOH in water to make 100 mL of solution. Which one of them has made the desired solution and why?
Name the process associated with the following
A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.
A solution is always a liquid. Comment.
Can a solution be heterogeneous?
A group of students took an old shoebox and covered it with black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole in it and making another hole on the other side to view the light. They placed a milk sample contained in a beaker/tumbler in the box as shown in Fig.2.4. They were amazed to see that milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it?
(a) Explain why the milk sample was illuminated. Name the phenomenon involved.
(b) The same results were not observed with a salt solution. Explain.
(c) Can you suggest two more solutions that would show the same effect as shown by the milk solution?
What do you understand by the term solute with reference to a solution?
