Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 32

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IMPORTANT

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Which of the following represents a correct chemical formula?

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Important Questions on Atoms and Molecules

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 33

If the number of electrons in an ion Z^3-is 10, the atomic number of element Z will be:

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 34

The anion of an element has:

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 35

A particle X has 17 protons, 18neutrons and 18 electrons. This particle is most likely to be:

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 36

An element which can exhibit the valencies of

2, 4

and

6

can be:

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 37

The atomic number of an element E is

16

. The number of electrons in its

E^{2 -}

will be:

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 38

The cation of an element has:

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 39

Two elements X and Y have valencies of 5 and 3, and 3 and 2 respectively. The elements X and Y are most likely to be respectively;

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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 40

The number of electrons in an ion Y²⁺is

10

. The atomic number of element Y is most likely to be: