C - 2, Is Matter Around Us Pure || MCQs

Answers given below of these Questions

Q1. Which of the following will show “Tyndall” effect? 

(a) salt solution 

(b) Milk 

(c) copper sulphate solution 

(d) starch solution 

Q2. Tincture of iodine has antiseptic properties. This solution is made by dissolving 

(a) Iodine in potassium iodide             

(b) iodine in Vaseline 

(c) iodine in water                             

(d) iodine in alcohol 

Q3. Rusting of an article made up of iron is called 

(a) Corrosion and it is a physical as well as chemical change 

(b) Dissolution and it is a physical change 

(c) corrosion and it is a chemical change 

(d) dissolution and it is a chemical change 


Q4. Blood and sea water are  

(a) both mixtures  

(b) both are compounds  

(c) blood is a mixture whereas sea water is a compound 

(d) blood is a compound and sea water is a mixture 

Q5. Boron and carbon are  

(a) metalloids 

(b) metalloids and non- metal respectively 

(c) metal 

(d) non-metal and metalloid respectively 

Q6. Identify the physical changes. 

(i) melting of iron metal 

(ii) rusting of iron 

(iii) bending of an iron rod 

(ivdrawing a wire of iron metal 

(a) (i), (ii) and (iii) 

(b) (i), (ii) and (iv) 

(c) (i), (iii) and (iv) 

(d) (ii), (iii) and (iv) 

Q7. A mixture of sulphur and carbon disulphide is  

(a) Heterogeneous and shows Tyndall effect 

(b) homogeneous and shows Tyndall effect 

(c) heterogeneous and does not show Tyndall effect 

(d) homogeneous and does not show Tyndall effect 

Q8. Which of the following method would you use to separate cream from milk? 

(a) Fractional distillation 

(b) Distillation 

(c) Centrifugation 

(d) Filtration 

Q9. Name the metal which exist in liquid state at room temperature. 

(a) Sodium 

(b) Potassium 

(c) mercury 

(d) bromine 

Q10.Element which is not a metalloids 

(a) Silicon 

(b) Germanium 

(c) Tungsten 

(d) Boron 

Q11. The amount of camphor keeps on decreasing if we put it in an open container due to  

(a) Precipitation 

(b) Condensation 

(c) Sublimation 

(d) Evaporation 

Q12.How many elements are in gaseous state at room temperature? 

(a) 11 

(b) 23 

(c) 14 

(d) 9


Q13. Which application is used in diagnostic laboratories for blood and urine test? 

(a) Chromatography 

(b) Centrifugation 

(c) Fractional distillation  

(d) Sublimation 

Q14. Chromatography is used to separate  

(i) Colours in a dye  

    (ii) Butter from cream 

(iii) Drugs from blood 

     (iv) Mixture of oil and water 

(a) (i) and (iv) 

(b) (ii) and (iii) 

(c) (iii) and (i) 

(d) (iv) and (ii) 

Q15. The continuous zig-zag movement of colloidal particles in dispersion medium is called 

(a) Tyndall effect 

(b) Brownian movement

(c) Oscillation 

(d) Dispersion 

Q16. Non-metal which is good conductor of electricity 

(a) Graphite 

(b) Silicon 

(c) Gold 

(d) Aluminium 

Q17. Which statement is true about compound? 

(a) It has a variable composition 

(b) It shows properties of constituent substances 

(c) It is mixed any proportion by mass 

(d) Elements react to form new compounds 

Q18. Sodium chloride dissolved in water can be separated by 

(a) Physical process 

(b) Physical process of evaporation 

(c) Chemical process 

(d) Chemical process of extraction 


Q19.Brass is a mixture of  

(a) Zinc, Mg 

(b) Zinc, Copper 

(c) Zinc, Carbon 

(d) Zinc, Co 

Q20. When more than one kind of pure form of matter combines it forms 

(a) Solution  

(b) Component  

(c) Texture 

(d) Mixture 

Q21. Mixture of two or more metals, or metals and non-metal is known as 

(a) Solution 

(b) Mixture 

(c) Alloy 

(d) Metalloid 

Q22. The component of solution that dissolved in solvent is  

(a) Solvent  

(b) Solute 

(c) Sugar 

(d) Mixture 

Q23. Air is which type of mixture 

(a) Gas  

(b) Homogeneous 

(c) Heterogeneous  

(d) Solid 

Q24. The amount of solute present in the saturated solution at this temperature is called its  

(a) Unsaturation 

(b) Diffusion 

(c) Collusion 

(d) Solubility 

Q25. Mass of solute divided by mass of solution multiply by 100 is formula to get 

(a) Mass  

(b) Mass percentage of solution 

(c) Volume percentage 

(d) Solution 

Q26. When solids are dispersed in liquids it is called 

(a) Dissolution 

(b) Collusion 

(c) Suspension 

(d) Diffusion 

Q27. Crystallisation method is used to purify  

(a) Gases 

(b) Solids 

(c) Metals 

(d) Liquids 

Q28. Dye and black ink is separated by the method of 

(a) Chromatography 

(b) Sublimation 

(c) Suspension 

(d) Distillation 

Q29. Korma is used for 

(a) Dyes 

(b) Paints 

(c) Colours 

(d) Liquids 

Q30. Petroleum products are separated by the method of 

(a) Fractional distillation 

(b) Sublimation 

(c) Suspension 


Answers :-

1 - Both (a) and (b)  Milk and starch solution. 

2 - (d) iodine in alcohol 

3 - (c) corrosion and it is a chemical change

4 - (a) both mixtures 

5 - (b) metalloid and non-metal respectively 

6 - (c) (i), (iii) and (iv) 

7 - (d) homogeneous and does not show Tyndall effect 

8 - (c) Centrifugation

9 - (c) mercury 

10 - (c) tungsten 

11 - (c) sublimation 

12 - (a) 11 

13 - (b) centrifugation 

14 - (c)  (iii) and (i) 

15 - (b) Brownian movement 

16 - (a) graphite 

17 - (d) elements react to form new compounds 

18 - (b) physical process of evaporation

19 - (b) Zinc, copper 

20 - (d) mixture 

21 - (c)  Alloy 

22 - (b) solute 

23 - (b) homogeneous 

24 - (d) Solubility 

25 - (b) mass percentage of solution 

26 - (c) suspension 

27 - (b) solids 

28 - (a) chromatography 

29 - (c) colours 

30 - (a) fractional distillation