Question

please anyone make a subjective surprise test of class 9th chapter is matter around us pure as I am having the test of same chapter tomorrow so I want to just see that how much I am mentally and physically prepared. I will also share my my answer sheet after doing to u.​

Answer 1

Answer:

FILL IN THE BLANKS:-

1.Common salt is _________.

2.A mixture contains more than ______ substance mixed in ______ proportion.

3.Properties of a __________ are different from its constituent elements, whereas a _______ shows the properties of its constituting elements.

4.A solution is defined as a mixture that is-----------.

5.We can remove salts from a solution by using the process of ----------

6. A pure substance has a fixed__________ or ______ at constant temperature.

7.An element is made up of only one kind of _________.

8.Miscible liquids are separated by ________ .

9.Immiscible liquids are separated by using a _______.

10.Filtered tea is a _________ mixture.

11.Alloy is a _______.

12.Sublimation of camphor is a _________ change.

13.Most common chemical change we observe in our routine life is rusting of______.

TRUE / FALSE

1.Water is homogenous substance.

2.Element is always metal.

3.Substance is always homogeneous

4.In compound elements combine in definite proportion.

5.Iodine can be purified by sublimation.

6.Mixtures are always combinations of the same compounds that are at different states.

7.We can separate all mixtures by filtration.

8.All mixtures are defined as “ heterogeneous”

9.Only specific compounds can be combined to form mixtures.

10.No pure elements are liquids at room temperature.

11.Mixtures are combinations of one or more compounds that can be separated with chemical processes.

12.Crystals can be made of mixtures

VERY SHORT ANSWER QUESTIONS

1.What difference in the property of two miscible liquids enables their separation by fractional distillation?

2.Why is solution not heated to dryness to get crystals?

3.Give one example each of homogeneous and heterogeneous mixture.

4.Name the apparatus by which mixture of oil and water can be separated.

5.How can we check whether the given soli substance is pure or not?

6.A hard substance produces a tinkling sound when beat. Is it metal or a non- metal?

7.Is brass a mixture or a compound?

8.What type of solution is an alloy?

Liquid solution or solid solution

9.A mixture consisting of two miscible liquids 'A' and 'B' whose boiling points differ by 50 C can be separated by which process?

10.Which separation, technique is employed to separate complex mixture of organic compounds like carbohydrates, amino acids. Vitamins, hormones, etc?

11.In fractional crystallization two organic compounds gets differentiated on the basis of which property.

12.Which method can be used to separate mixture of iron filings and common salt?

13.Give one example of solid- liquid homogeneous mixture.

14.What is a aquaregia?

15.Which method is used to separate two immiscible liquids?

16.Name two elements which are in liquid state at room temperature?

Answer 2

Explanation:

MCQ :

1. What is the name of the metal which exists in liquid state at room temperature?
3. (a) Sodium
5. (b) Potassium
7. (c) Mercury
8. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:
10. (a) Centrifugation
12. (b) Fractional distillation
14. (c) Evaporation
16. (d) Tunneling
17. What is the name of the metal which exists in liquid state at room temperature?
19. (a) Mercury
21. (b) Bromine
23. (c) Sodium
25. (d) Potassium

Which of the following elements is not a metalloid?

(a) Boron

(b) Silicon

(c) Germanium

(d) Tungsten

5. Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:

(a) Colloidal solution

(b) Super saturated solution

(c) Sublimation

(d) Suspensions

6. If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of

(a) Evaporation

(b) Precipitation

(c) Condensation

(d) Sublimation

7. tincture of iodine, find the solute and solvent?

(a) alcohol is the solute and iodine is the solvent

(b) iodine is the solute and alcohol is the solvent

(c) any component can be considered as solute or solvent

(d) tincture of iodine is not a solution

8. The continuous zig-zag movement of colloidal particles in a dispersion medium is called

(a) Dispersion

(b) Tyndall effect

(c) Brownian movement

(d) Oscillation

9.A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as

(a) a compound

(b) an element

(c) a molecule

(d) a mixture

10. Which of the following non-metal is a good conductor of electricity?

(a) Aluminium

(b) Silicon

(c) Graphite

(d) Gold

11. Which of the following property does not describe a compound?

(a) It is composed of two or more elements

(b) It is a pure substance.

(c) It cannot be separated into constituents by physical means

(d) It is mixed in any proportion by mass

12. When two liquids do not mix, they form two separate layers and are known as

(a) Miscible liquids

(b) Immiscible liquids

(c) Saturated liquids

(d) Super saturated liquids

Answers:

1. Answer: (c) Mercury.
2. Answer: (a) Centrifugation.
3. Answer: (b) Bromine.
4. Answer: (d) Tungsten.
5. Answer: (d) Suspensions.
6. Answer: (d) Sublimation.
7. Answer: (b) iodine is the solute and alcohol is the solvent.
8. Answer: (c) Brownian movement.
9. Answer: (b) an element.
10. Answer: (c) Graphite.
11. Answer: (d) It is mixed in any proportion by mass.
12. Answer: (b) Immiscible liquids.

Hope this will help you

please make this as brain list