Q1. What is a mixture?
Answer: A mixture is a substance formed by physically mixing two or more chemical substances in an indefinite proportion. No chemical bond exists between chemical substances.
Q2. Classify the following into mixture and compound.
- Soil
- Air
- Alloy
- Sugar
- Soap solution
- Milk
- Coal
- Blood
- Glucose.
Answer: Soil, Air, Alloy, Soap solution, Milk, Coal, and Blood are examples of mixtures, while sugar and glucose are examples of compounds.
Q3. Is the mixture a pure substance?
Answer: No, the mixture is not a pure substance.
Q4. Are alloys homogeneous or heterogeneous mixtures?
Answer: Alloys are homogenous mixtures.
Q5. Why doesn’t air show the same composition overall places?
Answer: Air doesn’t show the same composition overall places because the addition of gases, particles, and pollutants is not the same at all locations.
Q6. What are homogenous mixtures?
Answer: A homogeneous mixture is a mixture having the same proportions of its components throughout the sample.
Q7. What are heterogeneous mixtures?
Answer: A heterogeneous mixture is a mixture having the non-uniform proportions of its components throughout the sample.
Q8. Give some examples of homogenous mixtures.
Answer: Alloys, sugar and salt solutions are examples of homogenous mixtures.
Q9. Give some examples of heterogeneous mixtures.
Answer: Blood, Mud water, Sand & Salt, and Sugar & Salt are examples of heterogeneous mixtures.
Q10. Why does a mixture show a heterogeneous appearance?
Answer: A mixture typically shows a heterogeneous appearance because constituents of the mixture are non-uniform.
Distinguish between Iron filings and Sulphur powder based on their Appearance, i.e., homogeneity and heterogeneity
Q11. Is mixing iron filings and sulphur powder a physical or chemical change?
Answer: Mixing iron filings and sulphur powder is a physical change.
Q12. What kind of mixture is formed by mixing iron filings and sulphur powder?
Answer: A non-uniform heterogeneous mixture is formed by mixing iron filings and sulphur powder.
Q13. Does the mixture of iron filings and sulphur powder retain its constituent properties?
Answer: Yes, the iron filings and sulphur powder mixture retain their constituent properties. We can even separate them based on their properties.
Distinguish between Iron filings and Sulphur powder based on their behaviour towards a magnet
Q14. Give one test to show that iron filings and sulphur powder mixture can be separated physically.
Answer: By rolling a magnet, we can easily separate iron filings and sulphur powder mixture physically.
Q15. How can we separate iron filings and sulphur powder mixture using a magnet?
Answer: Yes, we can easily separate iron filings and sulphur powder mixture using a magnet. If we roll a magnet over the mixture, the iron filings will stick to the magnet, and sulphur powder will be left behind. Mixing iron filings and sulphur powder is a physical change, i.e. the individual particle’s constituent properties are not lost.
Distinguish between Iron filings and Sulphur powder based on their behaviour towards Carbon disulphide as a solvent
Q16. Why do we use carbon disulphide as a solvent and not water?
Answer: We use carbon disulphide instead of water because sulphur is soluble in carbon disulphide and insoluble in water.
Q17. How can we separate iron filings and sulphur powder mixture using carbon disulphide as a solvent?
Answer: Yes, we can easily separate iron filings and sulphur powder mixture using carbon disulphide as a solvent. If we add carbon disulphide to the iron filings and sulphur powder mixture, sulphur will dissolve in the carbon disulphide solution leaving behind iron fillings. Mixing iron filings and sulphur powder is a physical change, i.e. the individual particle’s constituent properties are not lost.
Q18. What precautions should be taken with carbon disulphide?
Answer: Carbon disulphide is flammable, so we should keep it away from the flame.
Distinguish between Iron filings and Sulphur powder based on their behaviour toward Heat
Q19. Can we separate iron filings and sulphur powder mixture by heating?
Answer: No, we can not separate iron filings and sulphur powder mixture by heating.
Q20. What happens when we heat the mixture of iron filings and sulphur powder?
Answer: When we heat the mixture of iron filings and sulphur powder together, a chemical reaction takes place.
Q21. Name the compound formed when we heat the iron filings and sulphur powder?
Answer: Iron sulphide is formed when we heat the mixture of iron filings and sulphur powder.
Q22. Do the iron filings and sulphur powder mixture retain their constituent properties after heating?
Answer: No, the iron filings and sulphur powder mixture does not retain their constituent properties after heating.
Q23. What change will you observe while heating iron filings and sulphur powder together?
Answer: We will observe that the colour of the mixture will change from yellow to black.
Q24. Can we separate the iron filings and sulphur powder mixture by a magnet after heating?
Answer: No, we can not separate the iron filings and sulphur powder mixture by a magnet after heating.
Q25. Can we separate the iron filings and sulphur powder mixture by using carbon disulphide as a solvent after heating?
Answer: No, we can not separate the iron filings and sulphur powder mixture by using carbon disulphide as a solvent after heating.
Download Class 9 Chemistry Viva questions on the To prepare a mixture using Iron filings and Sulphur powder and distinguish them based on their (i) Appearance, i.e., homogeneity and heterogeneity, (ii) Behaviour towards a magnet, (iii) Behaviour towards carbon disulphide as a solvent and (iv) Heat by clicking the button below.
