Among the following, number of pure substances are : Diamond, Brass, Alcohol, Germanium, Air, zinc sulphate, Milk, Steel, Distilled water, Gasoline.
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The correct Answer is:
To determine the number of pure substances among the given list, we need to analyze each item based on the definition of a pure substance. A pure substance consists of only one type of particle, which can be either an element or a compound with a fixed composition.
Let's evaluate each item:
1. **Diamond**:
- Diamond is an allotrope of carbon and consists solely of carbon atoms.
- **Conclusion**: Pure substance.
2. **Brass**:
- Brass is an alloy made of copper and zinc, and its composition can vary.
- **Conclusion**: Not a pure substance.
3. **Alcohol (C2H5OH)**:
- Alcohol has a fixed molecular formula and a consistent composition.
- **Conclusion**: Pure substance.
4. **Germanium**:
- Germanium is a chemical element and consists of only germanium atoms.
- **Conclusion**: Pure substance.
5. **Air**:
- Air is a mixture of various gases (like nitrogen, oxygen, carbon dioxide, etc.) and does not have a fixed composition.
- **Conclusion**: Not a pure substance.
6. **Zinc Sulphate (ZnSO4)**:
- Zinc sulphate is a compound with a fixed composition of zinc, sulfur, and oxygen.
- **Conclusion**: Pure substance.
7. **Milk**:
- Milk is a complex mixture containing water, fats, proteins, lactose, and minerals, and its composition can vary.
- **Conclusion**: Not a pure substance.
8. **Steel**:
- Steel is an alloy primarily made of iron and carbon, and its composition can vary.
- **Conclusion**: Not a pure substance.
9. **Distilled Water (H2O)**:
- Distilled water has a fixed molecular formula and is composed only of water molecules.
- **Conclusion**: Pure substance.
10. **Gasoline**:
- Gasoline is a mixture of hydrocarbons and does not have a fixed composition.
- **Conclusion**: Not a pure substance.
Now, let's summarize the pure substances identified:
- Diamond: Pure substance
- Alcohol: Pure substance
- Germanium: Pure substance
- Zinc Sulphate: Pure substance
- Distilled Water: Pure substance
**Total number of pure substances**: 5
To determine the number of pure substances among the given list, we need to analyze each item based on the definition of a pure substance. A pure substance consists of only one type of particle, which can be either an element or a compound with a fixed composition.
Let's evaluate each item:
1. **Diamond**:
- Diamond is an allotrope of carbon and consists solely of carbon atoms.
- **Conclusion**: Pure substance.
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MTG IIT JEE FOUNDATION-MATTER : ELEMENTS COMPOUNDS AND MIXTURES -EXERCISE (INTEGER/NUMERICAL VALUE )
