NEET 2022 Phase 2 | Structure of Atom Question 12 | Chemistry

When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $$\times$$ 10⁵ J mol^$$-$$1. What is the minimum energy needed to remove an electron from the metal?

(h = 6.626 $$\times$$ 10^$$-$$34 Js, c = 3 $$\times$$ 10⁸ ms^$$-$$1, N_A = 6.022 $$\times$$ 10²³ mol^$$-$$1)

2.31 $$\times$$ 10⁵ J mol^$$-$$1

2.31 $$\times$$ 10⁶ J mol^$$-$$1

3.84 $$\times$$ 10⁴ J mol^$$-$$1

3.84 $$\times$$ 10^$$-$$19 J mol^$$-$$1

NEET 2022 Phase 1

MCQ (Single Correct Answer)

-1

Identify the incorrect statement from the following.

All the five 5d orbitals are different in size when compared to the respective 4d orbitals.

All the five 4d orbitals have shapes similar to the respective 3d orbitals.

In an atom, all the five 3d orbitals are equal in energy in free state.

The shapes of d_xy, d_yz and d_zx orbitals are similar to each other; and d_{x² $$-$$ y²} and d_z² are similar to each other.

NEET 2022 Phase 1

MCQ (Single Correct Answer)

-1

If radius of second Bohr orbit of the He⁺ ion is 105.8 pm, what is the radius of third Bohr orbit of Li²⁺ ion?

158.7 pm

15.87 pm

1.587 pm

158.7 $$\mathop A\limits^o $$

NEET 2021

MCQ (Single Correct Answer)

-1

A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light c = 3.0 $$\times$$ 10⁸ ms^$$-$$1]

21.92 cm

219.3 m

219.2 m

2192 m

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