Chemistry | Study Mode

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Question 1

How many isotopes has hydrogen?

Explanation

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Correct option: B

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Question 2

Which of the following electrons configurations correctly represents an inert element?

1s²2s²2p⁴

1s²2s²2p⁶3s²

1s²2s²2p⁶3s²3p⁴

1s²2s²2p⁶

Explanation

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Correct option: D

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Question 3

What type of reaction is represented by the following equation?\(\frac{2}{1}\)D\(\frac{3}{1}\)H \(\frac{4}{4}\)He + \(\frac{1}{0}\)n + energy

Nuclear fission

Nuclar fusion

Radioactive decay

Spontaneous decay

Explanation

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Correct option: B

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Question 4

Which of the following ions has the electron configuration 2,8,8?

Na⁺

Mg²⁺

F^-

CI^-

Explanation

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Correct option: D

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Question 5

An element with the electron configuration of 1s ²2s ²2p ⁶ would have a combining power of

Explanation

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Correct option: A

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Question 6

Rare gases are stable because they

contain equal number of protons and neutrons

contain more electrons than protons

are chemically active

have octet structure

Explanation

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Correct option: D

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Question 7

Which of the following elements would produce coloured ions in aqueous solution?

Calcium

lron

Magnesium

Sodium

Explanation

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Correct option: B

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Question 8

The energy change that accompanies the addition of an electron to an isolated gaseous atom is

bond energy

electronegativity

electron affinity

ionization energy

Explanation

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Correct option: C

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Question 9

Which of the following hydrohalic acids is the weakest?

HBr

HCI

Explanation

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Correct option: D

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Question 10

Which of the following arrangements is in order of increasing metallic property?

Li < Na< k

Na < Li < K

K < Li < Na

Explanation

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Correct option: A

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