Class 9 - Chemistry Set 1

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FREE quick assessment test (20 Questions) by Improove. Plz visit www.improove.in

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1. Purity of a solid substance can be checked by its characteristic *

1 point

boiling point

melting point

solubility in water

solubility in alcohol

2. In which phenomenon water changes into water vapour below its B.P. ? *

1 point

Evaporation

Condensation

Boiling

No such phenomenon exist

3. In the formula of Al2(SO4)3, what will be the ratio of S by number of atoms ? *

1 point

4. Solids cannot be compressed because *

1 point

constituent particles are very closely packed.

interparticle attractive forces are weak.

movement of constituent particles are free.

constituent particles diffuse very slowly.

5. Filtration as a method of separation can be used for mixtures that are *

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homogeneous and liquid- in- gas mixture

heterogeneous and liquid -in -liquid mixture

homogeneous and solid - in- liquid mixture

heterogeneous and solid -in- liquid mixture

6. Milk is a ________ solution while vinegar is a _________ solution *

1 point

suspension, colloidal

colloidal, suspension

true, colloidal

colloidal, true

7. If the component of the substance can be separated by a chemical change only then it is *

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element

compound

mixture

none of these

8. Which of the following may or may not be capable of free existence? *

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Molecule

Atom

Electron

Proton

9. A solution if has maximum amount of solute at particular temperature then, it is known as *

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Saturated solution

Unsaturated solution

Supersaturated solution

Solution

10. Which of the following is an example of a bivalent cation *

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Aluminium ion

Sulphate ion

Magnesium ion

Sodium ion

11. These rays contain which subatomic particle ? *

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Electrons

Protons

Neutrons

Alpha particles

12. Which of the following would be described as impure ? *

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Crystallized salt

Salt solution

Common salt

All of the above

13. When a glass sheet is thrown, it breaks into small pieces. Which physical nature of matter is represented by the small pieces of glass? *

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Matter is continuous in nature

Matter is breakable

Matter is particulate in nature

Matter has solid state

14. Crystallisation process is used in one of the following processes. *

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Purification of salt that we get from sea water

To separate sugar from sea water

To separate camphor from salt

To separate constituents of blood

15. The particles of a true solution *

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are visible with naked eye

are visible with powerful microscope

cannot be seen even with microscope

None of these

16. Which of the following element carries 2 letters in its symbol. *

1 point

Tin

Tungsten

Flourine

Potassium

17. What is the mass of 6.022 Ã— 1022 atoms of He. *

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2 gm

4 gm

0.4 gm

0.2 gm

18. A bivalent anion of an element contains 10 electrons. The atomic number of the element is - *

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None of these

19. Which of the following is/are true about BEC? *

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It is gaseous super cooled phase

Occurs at zero kelvin

Atoms begin to clump

All of the above

20. A beaker containing water suddenly falls down
into another beaker containing milk. Which
type of force exhibits between the water and
milk molecules ? *

1 point

Gravity force

Adhesion force

Cohesion force

Coloumbic force

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