JEE Main 2017 (Online) 8th April Morning Slot | Structure of Atom Question 141 | Chemistry | JEE Main - ExamSIDE.com

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1

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of He⁺ is :

A

$${{5A} \over 9}$$

B

$${{9A} \over 5}$$

C

$${{36A} \over 5}$$

D

$${{36A} \over 7}$$

2

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

+4

-1

The radius of the second Bohr orbit for hydrogen atom is:
(Planck’s Const. h = 6.6262 × 10^-34 Js; mass of electron = 9.1091 × 10^-31 kg; charge of electron (e) = 1.60210 × 10^-19 C; permittivity of vacuum ($${\varepsilon _0}$$) = 8.854185 × 10^-12 kg^-1 m^-3 A²)

A

4.76 $$\mathop {\rm A}\limits^o $$

B

2.12 $$\mathop {\rm A}\limits^o $$

C

0.529 $$\mathop {\rm A}\limits^o $$

D

1.65 $$\mathop {\rm A}\limits^o $$

3

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

+4

-1

The group having isoelectronic species is:

A

O^2- , F^- , Na⁺, Mg²⁺

B

O^2- , F^- , Na, Mg²⁺

C

O^- , F^- , Na⁺, Mg²⁺

D

O^- , F^- , Na, Mg⁺

4

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

The total number of orbitals associated with the principal quantum number 5 is :

A

5

B

10

C

20

D

25

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