Given below are the Class 9 Science CBSE Extra Questions Is Matter around us pure .It has three and five questions to practice and excel in examination
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A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the
Define solubility. How does solubility. How does solubility of a solid in water change with temperature?
Two students A and B were given 10 ml of water in a bowl and a plate respectively. They were told to observe the rate of evaporation. Name the student whose water evaporates faster and explain its reason.
Why the inter-conversion of states of matter is considered as a physical change? Give three reasons to justify your answer.
(a) Name the separation technique you would follow to separate
(i) Dyes from black ink.
(ii) A mixture of salt and ammonium chloride
(iii) Cream from milk
(iv) Sodium chloride from its solution in water
(b) State the principle used in separating a mixture of two immiscible liquids.
How many litres of 15% (mass/ volume) sugar solution would it take to get 75 g of sugar?
During an experiment the students were asked to prepare a 10 % (Mass/ Mass) solution of sugar in water. Ramesh dissolved 10 g of sugar in 100 g of water while Sarika prepared it by dissolving 10 g of sugar in water to make 100 g of the solution.
a)Are the two solutions of the same concentration?
b)Compare the mass % of the two solutions.
Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water.
Give an example for each of following:
a)Solid -liquid homogeneous mixture
b)Gas- gas homogeneous mixture
c)Liquid -liquid heterogeneous misture
Distinguish between homogeneous and heterogeneous mixtures. Classify the following mixtures as homogeneous and heterogeneous:
(i) Tincture of iodine (ii) Smaoke
(iii) Brass(iv) Sugar solution
A teacher told three students A, B and C to prepare 25% solution (mass by volume) of KOH. Student A dissolved 25 g of KOH in 100 g of water, student B dissolved 25 g of KOH in 100 mL of water and student C dissolved 25 g KOH in water and made the volume 100 mL. Which one of them has made required 25% solution? Give your answer with reason.
Calculate the mass of water and mass of glucose required to make 250 g of 40% solution of glucose.
‘Colloidal solution appears to be homogeneous but actually it is heterogeneous.’ Give justification for this statement.
When a fine beam of light enters a room through a small hole, Tyndall effect is observed. Why does this happen? Give one more example where this effect can be observed.
With the help of a flow diagram, show the process of obtaining different gases from air. if the boiling point of oxygen, argon and nitrogen are 183° C, - 186° C and - 196° C respectively, which gas gets liquefied first as the air is cooled?
Differentiate between miscible and immiscible liquids. Give an example of each.
Write the role of following in water purification system:
(a) Sedimentation Tank(b) Loading tank(c) Chlorination tank
Crystallization is better technique than simple evaporation technique. Justify this statement by giving two reasons.
(i) Name a technique to separate a mixture of two or more miscible liquids for which difference in boiling points is less than 25 K.
(ii) Describe the structure of the column used in the above technique. Why is it used?
When do we use the process of centrifugation? State the principle involved in this process. List its any two applications in our daily life.
A mixture contains two liquids A and B, which differ in tyheir boiling points by 20 K. suggest a suitable process to separate them. Draw a neat labeled diagram to explain this process.
Define distillation. What type of mixture can be separated by distillation?
What is the principle of separating funnel technique? How it is useful in extraction of iron from its ore?
List three differences between a physical change and a chemical change.
Differentiate between, an element and a compound (any two points) with one example each.
(i) Name the compound formed on heating a mixture of iron filings and sulphur.
(ii) If dilute HCI is added to above compound then name the gas evolved and write down its two properties.
State any three differences between a mixture and a compound.
How will you separate a mixture of common salt, camphor and iron filings .Describe the process.
Write your observation when the following processes take place:
a. An aqueous solution of sugar is heated till it gets dried up.
b. A saturated solution of KCL at 60° C is allowed to cool at room temperature.
c. A mixture of iron filings and sulphur powder is heated strongly.
d. A bean of light is passed through colloidal solution.
e. Dilute HCI is added to mixture of iron filings and sulphur powder.
what is chromatography? How will you separate the components of black ink using chromatography? Write any two applications of chromatography.
(a) You are given a mixture of sand, water and mustard oil. How will you separate the components of this mixture? Explain it with the help of different separation methods involved in it.
(b) Give flow diagram showing the process of obtaining gases from air.
A.Which of the following are chemical changes and physical change?
(i) Decaying of wood
(ii) Sawing of wood
(iii) Burning of wood
(iv) Hammering of a nail into a piece of wood
B.We know that Tincture of iodine has antiseptic properties. This solution is made by dissolving
(a) iodine in alcohol
(b) iodine in vaseline
(c) iodine in $H_20$
(d) iodine in $KI$
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.
Give two examples from daily life where Tyndall effect is observed.
Identify homogeneous and heterogeneous mixtures among the following:
Air, salt solution, kerosene in water, muddy water, soil, soda water
Three students A, B and C prepared mixtures using chalk powder, common salt and milk respectively in water. Whose mixture:
a)Would not leave residue on filter paper after filtration?
b)Would show Tyndall effect?
c)Would give transparent/ clear solution?
d)Would settle down at the bottom when left undisturbed?
e)Could be filtered by filter paper?
Based on the following characteristics distinguish in tabular form the behavior of true solution, suspension and colloidal solution:
(i) Appearance(ii) Visibility(iii) Filterability
(iv) Tyndall effect(v) stability(vi) Particle size
List any three properties on the basis of which a colloidal solution can be recognized.
How will you separate a mixture of red and blue inks? Name the technique used. Draw a labeled diagram and explain it.
Explain the term fractional distillation. Draw a labeled diagram for carrying out the process of fractional distillation.
Show diagrammatically how water is purified in the water works system and list the processes involved.
(i) What is meant by crystallization? How is impure copper sulphate purified by the process?
(ii) Differentiate between simple distillation and fractional distillation.
Identify the physical and chemical changes from the following:
(i) Heating the mixture of iron and sulphur
(ii) Ripening of fruits
(iii) Dissolution of salt in water(iv) Rusting of iron – chair
(v) Making egg omelets
(a) Compare metals and non - metals based on their physical properties. (any four points)
(b) What are metalloids? Give two examples.
(c) Identify metals from the following: Boron, sodium, mercury, carbon.
1. hydrogen ______ is a color gas with a smell of rotten eggs
5. The major components in solution
6. Melting point and boiling point are _______ properties
7. Two elements are liquid at room temperature are mercury and _______
2. In colliads ,The particles are called the ______ phase and the medium in which they are distributed is called the dispersion medium.
3. amount of solute present per unit volume or mass of the solution or solvent
4. denser particles are forced to the bottom and the lighter particles stay at the top when spun rapidly
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