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Which of the following pairs can be cite...

Which of the following pairs can be cited as an example to illustrate the law of multiple proportion?

A

`Na_(2)O, K_(2)O`

B

`CaO, MgO`

C

`Al_(2)O_(3), Cr_(2)O_(3)`

D

`CO, CO_(2)`

Text Solution

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The correct Answer is:
To determine which pairs can illustrate the law of multiple proportions, we need to follow these steps: ### Step 1: Understand the Law of Multiple Proportions The law of multiple proportions states that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element can be expressed in a ratio of small whole numbers. ### Step 2: Analyze the Given Options We will analyze each option to see if they consist of two elements that can form more than one compound. 1. **First Option: Sodium, Oxygen, Potassium** - This option involves three elements (sodium, oxygen, potassium), which does not fit the requirement of the law of multiple proportions. Therefore, this option is discarded. 2. **Second Option: Calcium, Oxygen, Magnesium** - Similar to the first option, this option also involves three elements (calcium, oxygen, magnesium). Thus, it does not illustrate the law of multiple proportions and is discarded. 3. **Third Option: Aluminum, Chromium, Oxygen** - Again, this option includes three elements (aluminum, chromium, oxygen). Hence, it is also discarded. 4. **Fourth Option: Carbon and Oxygen** - This option involves only two elements: carbon and oxygen. They can form multiple compounds, such as carbon monoxide (CO) and carbon dioxide (CO2). ### Step 3: Calculate the Ratios - For CO (carbon monoxide): - Mass of carbon = 12 g - Mass of oxygen = 16 g - For CO2 (carbon dioxide): - Mass of carbon = 12 g - Mass of oxygen = 32 g (since there are two oxygen atoms) Now, we can set the ratios: - Ratio of mass of oxygen in CO to mass of oxygen in CO2: - 16 g (in CO) : 32 g (in CO2) = 1 : 2 ### Step 4: Conclusion Since the ratio of the masses of oxygen that combine with a fixed mass of carbon (12 g) is a small whole number (1:2), this pair (carbon and oxygen) illustrates the law of multiple proportions. ### Final Answer The pair that can be cited as an example to illustrate the law of multiple proportions is **Carbon and Oxygen**. ---
To determine which pairs can illustrate the law of multiple proportions, we need to follow these steps: ### Step 1: Understand the Law of Multiple Proportions The law of multiple proportions states that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element can be expressed in a ratio of small whole numbers. ### Step 2: Analyze the Given Options We will analyze each option to see if they consist of two elements that can form more than one compound. ...
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