Chemistry - Questions and Answers, General Study (GK)

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461.

Which one of the following is the correct configuration for Fe³⁺ (Z = 26)?

(a)(Ar) 4s² 3d⁶

(b)(Ar) 4s² 3d³

(c)(Ar) 3d⁵

(d)(Ar) 4s² 3d⁴

Comment

Answer is: C

462.

P-orbitals in a given shell can accommodate up to

(a)Four electrons

(b)Two electrons with parrallel spin

(c)Six electrons

(d)Two electrons with opposite spins

Comment

Answer is: C

463.

Which one of the following is the electronic configuration of the bivalent calcium Ca²⁺?

(a)(Ne) 3s² 3p⁶

(b)(Ne) 3s² 3p⁴

(c)(Ar) 4s²

(d)(Ar) 3s² 3p⁶

Comment

Answer is: A

464.

Rutherford's experiment, which established the nuclear model of the atom used a beam of

(a)Beta - particles which impinged on a metal foil and got absorbed

(b)Gamma - rays, which impinged on a metal foil and ejected electrons

(c)Helium atoms, which impinged on a metal foil and got scattered

(d)Helium nuclei, which impinged on a metal foil and got scattered

Comment

Answer is: D

465.

Which electron configuration describes a neutral atom in an excited state?

(a)(Xe) 6s¹4f¹⁴5d¹⁰6p³

(b)(He) 2s¹

(c)(Ne) 3s¹3p¹

(d)(Ar) 4s¹3d⁵

Comment

Answer is: C

466.

Which one among the following is the most appropriate statement with respect to the atomic weight of an element?

(a)The atomic weight of an element is the sum total of the number of protons and neutrons present in the atom of an element

(b)Unlike mass number, the atomic weight of an element can be a fraction

(c)The atomic weight of an element is a whole number

(d)The atomic weight of all the atoms in an element is the same

Comment

Answer is: B

467.

"Fixation of nitrogen" implies

(a)The liquification of nitrogen

(b)The conversion of atmospheric nitrogen into useful compounds

(c)The conversion of nitrogen into amines

(d)The solidification of nitrogen gas into the atmosphere

Comment

Answer is: B

468.

In an atom, the order of filling up to He orbitals is governed by

(a)Aufbau's principle

(b)Heisenberg's uncertainty principle

(c)Hund's rule

(d)Pauli's exclusion principle

Comment

Answer is: A

469.

Which of the following waves can propagate in a vacuum?
1. Radio waves
2. Light waves
3. X-rays
4. Ultrasonic waves
Select the correct answer using the codes given below.

(a)1, 2 and 3

(b)1, 2, 3 and 4

(d)1 and 4

Comment

Answer is: C

470.

Consider the following substances
1. Heavy water
2. Graphite
Which of the substances given above is/are used as a moderator is a nuclear reactor?

(a)Only 1

(b)Only 2

(c)Both 1 and 2

(d)Neither 1 nor 2

Comment

Answer is: C

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Chemistry - Questions and AnswersPage 47

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