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Chemistry MCQs for NEET — Practice Questions with Answers

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Mass of neutron is ........................times the mass of electron-

1840

1480

2000

None

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Explanation

(A) Mass of neutron = 1.675 x 10^-27kg

Mass of electron = 9.108 x 10^-31 kg.

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If the size of the first orbit of hydrogen atom is 5.29 nm, the size of the second orbit of He⁺ is

2.65 nm

21.16 nm

10.58 nm

5.29 nm

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Explanation

(B) Size of the first orbit of Hydrogen = 5.29 x 10^-9m

Size of the second orbit of Helium = 5.29 x 10^-9 x 2² /2= 10.58 nm.

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The number of d- electrons retained in Fe^{2+ :}

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Explanation

(b) Fe is 3d⁶, 4s²; Fe²⁺: 3d⁶

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What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n=4 to n=2 in the He⁺ spectrum?

n =4 to n=2

n = 3to n=2

n =3 to n=1

n =2 to n=1

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Which of the following sets of quantum numbers is not possible?

n = 1, 1=0, m=0, s=1/2

n = 2, 1=0, m=0, s= -1/2

n = 3, 1= 3, m = -3, s = 1/2

n = 3, 1 = 1, m = 0, s = -1/2

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Explanation

if n = 3 then l=3 is not possible.

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An isotone of ₃₂Ge⁷⁶ is:

(i) ₃₂Ge⁷⁷

(ii) ₃₃As⁷⁷

(iii) ₃₄Se⁷⁷

(iv) ₃₄Se⁷⁸

only (i) & (ii)

only (ii) & (iii)

only (ii) & (iv)

(ii) (iii) & (iv)

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Explanation

Isotones are these in which number of neutrons are same.

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Which of the following species has more number of electrons in comparison with the neutrons?

Al³⁺

O^2-

F^-

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Explanation

In O^2- , number of electrons are 10 and number of neutrons are 8

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The work function of a metal is 4.2 eV. If radiations of 2000 A fall on the metal then the kinetic energy of the fastest photo electron is

1.6 x 10^-19J

16 x 10¹⁰J

3.2 x 10^-19J

6.4 x 10^-10J

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Explanation

Use photoelectric effect equation

hc/ $λ$ = hc/ $λ^{0}$ + K.E ( hc/ $λ^{0}$ = work function)

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The relationship between energy E, of the radiation with a wavelength 8000 A and the energy of the radiation with a wavelength 16000 A is

E₁ = 6E₂

E₁ = 2E₂

E₁ = 4E₂

E₁ = 1/2E₂

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The tranistion of electrons in H atom that will emit maximum energy is:

n₃ $\to$ n₂

n₄ $\to$ n₃

n₅ $\to$ n₄

n₆ $\to$ n₅

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Explanation

If A is the higher level & B is the lower level then lesser is the value of B higher is the energy emitted.

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