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Assertion: The melting point of Group 15 elements generally increases down the group.

Reason: The metallic character of Group 15 elements increases down the group, leading to stronger metallic bonds and higher melting points

Option: 1

Both assertion and reason are true, and the reason is the correct explanation of the assertion.


Option: 2

Both assertion and reason are true, but the reason is not the correct explanation of the assertion.


Option: 3

The assertion is true, but the reason is false.

 


Option: 4

The assertion is false, but the reason is true.


Answers (1)

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The Assertion states that the melting point of Group 15 elements increases down the group. This means that the elements at the bottom of the group have higher melting points than those at the top of the group. The Reason given to support this is that the metallic character of Group 15 elements increases down the group, leading to stronger metallic bonds and higher melting points. The metallic character of an element refers to its ability to form metallic bonds, which is related to the number of valence electrons available for bonding. As we move down Group 15, the number of valence electrons increases, which means that there are more electrons available for metallic bonding. This results in stronger metallic bonds, which require more energy to break and hence higher melting points. Therefore, both the Assertion and Reason are correct, and the Reason provides a clear explanation for why the melting point of Group 15 elements increases down the group.  Hence option 1 is correct.

Option(2) Both assertion and reason are true and the reason explains assertion correctly. Hence option 2 is incorrect.

Option(3) Both assertion and reason are true. Hence option 3 is incorrect.

Option(4) Both assertion and reason are true. Hence option 4 is incorrect.

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