Question

Match the following with correct response

(a) 1-B, 2-D, 3-A, 4-C
(b) 1-C, 2-B, 3-D, 4-A
(c) 1-A, 2-C, 3-B, 4-D
(d) 1-D, 2-A, 3-C, 4-B

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Answer 1

(a) Option is correct.

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Answer 2

Answer:

The correct option is (a) 1-B, 2-D, 3-A, 4-C

(1) Dobereiner - (B) Traids

(2) Newland - (D) Octaves

(3) Mendeleev - Atomic mass

(4) Modern periodic table - Atomic number

Explanation:

• The Doberainer triad is a group of elements with identical properties discovered by the German chemist Johann Wolfgang Doberainer. He also observed that groups of three elements (called triads) formed, all having the same physical and chemical properties.
• The Law of Octaves, a generalization of British chemist J.A.R. in chemistry. In 1865 he Newlands discovered that when the chemical elements are arranged according to increasing atomic weight, something with similar physical and chemical properties occurs in every interval of he seven elements.
• Mendeleev's periodic law states that "property is a periodic function of atomic mass". This means that if you put the elements in order of atomic weight, the chemical and physical properties of the elements will repeat periodically.
• In the modern periodic table, elements are arranged in ascending order of atomic number.

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