Q1. What is a compound?
Answer: A compound is a substance formed by the chemical combination of two or more chemical substances in a definite proportion.
Q2. Identify compounds in the enlisted substances.
- Soil
- Air
- Alloy
- Sugar
- Soap solution
- Milk
- Coal
- Blood
- Glucose.
Answer: Sugar and Glucose are examples of compounds.
Q3. Is the compound a pure substance?
Answer: Yes, a compound is a pure substance.
Q4. Name the constituents of the enlisted compounds.
- Water
- Sugar
- Magnesium oxide
- Iron sulphide
Answer:
- The constituents of water are hydrogen and oxygen.
- The constituents of sugar are carbon, hydrogen and oxygen.
- The constituents of magnesium oxide are magnesium and oxygen.
- The constituents of iron sulphide are iron and sulphur.
Q5. How will you prove water is a compound?
Answer: Electrolysis of water proves that water is a compound. We get hydrogen and oxygen in a fixed ratio on electrolysis of water, i.e. 1:2.
Q6. Give some examples of the mixture formed by the compounds.
Answer: A mixture of common salt & sugar and a mixture of smoke, methane & carbon dioxide in the atmosphere are examples of the mixture formed by the compounds.
Q7. Define the law of constant proportion.
Answer: The law of constant proportions states that the elements are present in a fixed proportion by mass in a compound.
Q8. Give some examples of compounds.
Answer: Water, Salt, Sugar, Baking Soda, and Baking Powder are some examples of compounds.
Q9. Do compounds retain their constituent property?
Answer: No, compounds don’t retain their constituent properties.
Q10. How can you prepare a compound of iron filings and sulphur powder?
Answer: We can prepare a mixture of iron filings and sulphur powder by heating them.
Distinguish between Iron filings and Sulphur powder based on their Appearance, i.e., homogeneity and heterogeneity
Q11. Is the compound of iron filings and sulphur powder a physical or chemical change?
Answer: The iron filings and sulphur powder compound are chemical changes.
Q12. What is the colour of iron filings and sulphur powder compound?
Answer: Iron filings and sulphur powder compound is black coloured.
Q13. Does the compound of iron filings and sulphur powder retain its constituent properties?
Answer: No, the iron filings and sulphur powder compound doesn’t retain their constituent properties. We can not separate them based on their constituent properties.
Distinguish between Iron filings and Sulphur powder based on their behaviour towards a magnet
Q14. Can we separate iron filling and sulphur powder compound physically?
Answer: No, we cannot physically separate iron filling and sulphur powder compound.
Q15. Can we separate iron filling and sulphur powder compound using a magnet?
Answer: No, we cannot separate iron filling and sulphur powder compound using a magnet.
Distinguish between Iron filings and Sulphur powder based on their behaviour towards Carbon disulphide as a solvent
Q16. Why is carbon disulphide used as a solvent instead of water?
Answer: Carbon disulphide is used as a solvent instead of water because sulphur is soluble in carbon disulphide.
Q17. Can we separate iron filling and sulphur powder compound using carbon disulphide as a solvent?
Answer: No, we cannot separate iron filling and sulphur powder compound using carbon disulphide as a solvent.
Q18. What safeguards should be carried with carbon disulphide?
Answer: Carbon disulphide is combustible, so we should keep it away from the flame.
Distinguish between Iron filings and Sulphur powder based on their behaviour toward Heat
Q20. What happens when we heat iron filings and sulphur powder together?
Answer: When we heat the iron filings and sulphur powder together, a chemical reaction takes place, leading to the formation of black residue.
Q21. Which compound is formed while heating iron filings and sulphur powder together?
Answer: Iron sulfide is formed by heating iron filings and sulphur powder.
Q22. Do iron filings, and sulphur powder compound retain their individual property after heating?
Answer: No, the compound of iron filings and sulphur powder doesn’t retain their individual property 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.
