1.

Assertion : The radius of the first orbit of hydrogen atom is 0.529 Å. Reason : Radius for each circular orbit (r_n)=0.529 Å (n^2//Z) , where r=1,2,3 and Z = atomic number.

Answer»

If both assertion and reason are true and the reason is the correct explanation of the assertion
If both assertion and reason are true butreason isnot the correct explanation of the assertion
If assertion is true but reason is false
If the assertion and reason both are false

Solution :Both assertion and reason are true and reason is the correct explanation of assertion.
RADIUS , `r=(n^2h^2)/(4pie^2 mZ)=n^2/Z xx 0.529 Å.r_n` also increases INDICATING a greater SEPARATION between the orbit and the NUCLEUS


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