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Solution


Q.

Given below are two statements:                                                     [2025]

Statement I: According to the law of Octaves, the elements were arranged in the increasing order of their atomic number.

Statement II: Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.

In the light of the above Statements, choose the correct answer from the options given below:
1 Both Statement I and Statement II are true.  
2 Statement I is false but Statement II is true.  
3 Statement I is true but Statement II is false.  
4 Both Statement I and Statement II are false.  

Ans.

(4)

Statement I: Law of Octaves (given by John Alexander Newlands in 1865) – When elements are arranged in increasing order of their atomic mass then every eighth element has properties similar to the first element.

Statement II: Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic mass.