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in Some Basic Concepts of Chemistry by (30.3k points)
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1. Classify the following as homogeneous and heterogeneous mixtures. 

Air, Smoke, Gunpowder, NaCI solution, Petrol, Bronze, Mixture of sugar and sand. 

2. State and explain law of multiple proportions with example.

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1. Homogeneous- Air, NaCI solution, Bronze, Gun powder, Petrol. 

Heterogeneous – Mixture of sugar and sand, Smoke. 

2. When two elements combine to form more than one compound the different masses of one of the elements combining with fixed mass of the other element bear a simple ratio. 

eg. Carbon reacts with oxygen to form two compounds viz. CO and CO2 . In CO mass ratio is 12:16. In CO2 mass ratio is 12:32. Then mass ratio between oxygen in the 2 compounds is 16:32 or 1:2 which is a simple whole number ratio. Hence, the law is verified.

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