Assertion : For Balmer series of hydrogen spectrum, the value n_1=2 and n_2=3,4,5 . Reason : The value of n_2 for a line in Balmer series of hydrogen spectrum having the highest wavelength is 6 .

Correct answer: C. If assertion is true but reason is false. The wavelength of the line can be calculated by the Rydberg formula : (1)/(λ)= R((1)/(n_1^2)-(1)/(n_2^2)), R= Rydberg constant Therefore, wavelength will be highest in Balmer series (n_1=2. ) when n_2 is 3 .

AIIMS 2015

Exam: AIIMS
Year: 2015
Subject: Chemistry
Chapter: Structure of Atom

AIIMS 2015 · Chemistry · Structure of Atom

Assertion : For Balmer series of hydrogen spectrum, the value n_1=2...

Assertion : For Balmer series of hydrogen spectrum, the value

n_1=2

and

n_2=3,4,5 \ldots

. Reason : The value of

n_2

for a line in Balmer series of hydrogen spectrum having the highest wavelength is 6 .

Options

AIf both assertion and reason are true and reason is the correct explanation of assertion.
BIfboth assertion and reason are true but reason is not the correct explanation of assertion.
CIf assertion is true but reason is false.
DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

The wavelength of the line can be calculated by the Rydberg formula :

\frac{1}{\lambda}=

R\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right),

R=

\text{ Rydberg constant }

Therefore, wavelength will be highest in Balmer series \left(n_1=2\right.

) when

n_2

is 3 .

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