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MCQS

Sindh MDCAT 2023

Q-95

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<p>Radius of the first orbit of hydrogen is 0.53 A. Which orbit has a radius of 4.77 A?</p>

Chemistry

Miscellaneous

Question 95 of 200

Multiple Choice

First

2.83%

Explanation:

1st orbit; (1)^2(0.53) = 0.53Å

Second

12.88%

Explanation:

2nd orbit; (2)^2(0.53) = 2.12Å

Third

64.99%

Explanation:

3rd orbit; (3)^2(0.53) = 4.77 Å

Fourth

19.30%

Explanation:

Explanation

The radius of any orbit can be calculated by using formula n^2 (0.53)

For 1st orbit; (1)^2(0.53) = 0.53Å

For 2nd orbit; (2)^2(0.53) = 2.12Å

For 3rd orbit; (3)^2(0.53) = 4.77 Å

So, 4.77 Å is radius for third orbit. Hence, option C is correct.