Question # 1

When we mvoe top to bottom in group, ionization energy.

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Increases

No effet

Decreases

None of these

Point out the incorrect statement about electron affinity

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It decreases in a period

It decreases in a group

It is measure din kJmol-1

None of these

Actinide series starts after the element

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Actinium

Lanthanum

Osmum

Silver

Number of peiod in the periodic table are.

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7

8

5

16

Electronegativity of oxygen is.

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3,1

3,3

3.4

3,2

How many elements are present in 6th period.

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2

8

18

32

Aong the period which one of the followig decreases.

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Electronegativity

Ionization energy

Atomic radius

Electron affinity

Atomic number of actinium is

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57

60

89

80

How many periods are present in the modern periodic table

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7

8

10

12

Whcih element is presnet in 2nd period.

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Lithium

Beryllium

Boron

All of these

The amoutn of energy given out when an electron is added to an eatom is called.

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Electron affinity

Lattice energy

Ionization energy

Electronegativity

The minium amont of energy whcih is required to remvoe an electron from valence shell of the gaseous state of an atom is called.

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Potential energy

Ionization energy

Electron affinity

Electronegativity

Which of the following elemens is presnet in 1st period.

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Hydrogen

Helium

Both a and b

None of these

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Chemistry 9th Class English Medium Unit 8 Online Test MCQs With Answers

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