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9th CBSE
IMPORTANT
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The cation of an element has: 

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Important Questions on Atoms and Molecules

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9th CBSE
IMPORTANT
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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9th CBSE
IMPORTANT
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:
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9th CBSE
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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 41
A particle P has 18 electrons, 20 neutrons and 19 protons. This must be :
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9th CBSE
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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 42
An ionic compound will be formed by the combination of one of the following pair of elements. The pair of elements is 
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9th CBSE
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Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 43
Molecular compounds are usually formed by the combination between:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 44
The formula of a compound is X3Y. The valencies of elements X and Y will be respectively: 
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 45
The formula of the sulphate of an element X is X2(SO4)3. The formula of nitride of element X will be:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Questions Based on High Order Thinking Skills (HOTS)>Q 46

An element A forms an oxide A2O5. What is the valency of element A?