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Which of the following is correct set of Dobereiner Triads?

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Important Questions on Classification of Elements and Periodicity in Properties

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 16
The metal which is hard and has high melting point and used in electric bulbs is _____.
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 17
The lightest liquid metal is _____.
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 18
Which statement is not true about noble gases?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 19
Elements of which group form anions most readily?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 20
On moving horizontally across a period, the number of electrons in the outermost shell increases from _____ to _____.
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 21
Which of the following is not a representative element?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 22
The scientist who made maximum contribution towards periodic table was _____.
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 23
Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group?