Chemistry | Study Mode

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Question 1

Which of the following instruments is used in detecting the presence of radiation?

Cathode ray tube

Geiger-Muller counter

Mass spectrometer

X-ray tube

Explanation

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Correct option: B

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Question 2

The molecule which has a linear shape is

CH₄

NH₃

H₂S

CO₂

Explanation

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Correct option: D

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Question 3

The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is

M₂Y₃

M₃Y₂

M₃Y

Explanation

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Correct option: A

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Question 4

An atom of an element X gains two electrons. The symbol of the ion formed is

X ⁺

X ²⁺

X ^2-

X ^-

Explanation

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Correct option: C

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Question 5

Which of the following statements is correct?

Atomic size decreases down the group

Atomic size increases across the period

Anions are smaller than the parent atom

Cations are smaller than the parent atom

Explanation

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Correct option: D

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Question 6

Which of the following arrangements represents the correct order of electronic energy level?

1s 2p 2s 3p 3s 3d 4s

1s 2s 2p 3s 3p 3d 4s

1s 2s 2p 3s 3p 4s 3d

1s 2s 3s 2p 3p 4s 3d

Explanation

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Correct option: C

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Question 7

The element with electron configuration 1s² 2s² 2p ⁶ 3s² 3p¹ belongs to

s-block period 3, group 1

p-block, period 3, group 2

s-block, period 3, group 3

p-block, period 3, group 3

Explanation

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Correct option: D

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Question 8

In the periodic table all elements within the same group have the same

number of neutrons

number of valence electrons

number of isotopes

atomic number

Explanation

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Correct option: B

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Question 9

Which of the following halogens is liquid at room temperature?

lodine

Chlorine

Bromine

Fluorine

Explanation

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Correct option: C

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Question 10

Rare gases are stable because they

are chemically active

contain equal number of protons and neutrons

contain more electrons than protons

have octet structures

Explanation

Explanation not provided, please join discuss, your contributions are welcomed

Correct option: D

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