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9th CBSE
IMPORTANT
Earn 100

The radioactive isotope used in the treatment of cancer is:

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Important Questions on Structure of Atom

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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 40
Elements having valency 'one' are:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 41
In a sample of ethyl ethanoate (CH3COOC2H5), the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 42
Which of the following elements does not exhibit electrovalency?
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 43
The number of valence electrons in a graphite atom is:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 44
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 45
The number of valence electrons in a sulphide ion, S2-, is:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 46
For an element, Z = 9. The valency of this element will be:
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9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 4 - Structure of Atom>Multiple Choice Questions (MCQs)>Q 47
Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be: