Tag: the periodic table

Questions Related to the periodic table

X and Y are two elements having similar properties which obey Newlands law of octaves. The number of elements in between X and Y respectively are:

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. 8

  2. 6

  3. 7

  4. 9

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Correct Option: B

The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25C°. The equilibrium constant of the reaction would be
(Given, $F = 96500 C mol^{-1}, R = 8. 314 JK^{-1} mol^{-1}$ )

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. $2.0\times 10^{11}$

  2. $4\times 10^{12}$

  3. $1\times 10^{2}$

  4. $1\times 10^{10}$

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Correct Option: D
Explanation:

The Newland's law of octaves for the classification of elements was found to be applicable only up to the element ______________________.

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. potassium

  2. calcium

  3. cobalt

  4. phosphorous

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Correct Option: B
Explanation:

The Newland's law of octaves for the classification of elements was found to be applicable only up to the element calcium.


Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.

 Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law.

The elements $A$ and $B$ obey Newland's law of octave. How many elements are there between $A$ and $B$?

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. 7

  2. 8

  3. 5

  4. 6

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Correct Option: D
Explanation:

According to the law of octaves, those with similar physical and chemical properties occur after each interval of seven. 


Thus if $A$ is the first element and $B$ is the eighth element, the number of elements in between $A$ and $B$ is 6.

Hence, option D is correct.

The element which resembled cobalt, nickel and was placed in Newland's table far away from those elements was:

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. sodium

  2. calcium

  3. iron

  4. chlorine

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Correct Option: C
Explanation:

Iron resembled cobalt and nickel and in Newlands' table was placed far away from those elements. It was placed in the last group in Newlands' table.

The element placed with nickel in the table formed by Newlands was :

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. iron

  2. cobalt

  3. chromium

  4. copper

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Correct Option: B

John Newlands arranged the known elements in a/an  ______ order of their atomic _______ .

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. increasing, masses

  2. decreasing, masses

  3. increasing, numbers

  4. decreasing, numbers

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Correct Option: A
Explanation:

John Newlands arranged the known elements in an increasing order of their atomic masses. He started with the element having the lowest atomic mass ( hydrogen ) and ended at thorium which was the $56^{th}$ element. Some of the elements satisfying this order are arranged as $H, Li, Be, B, C, N, O$.

The given arranged sequence on the basis of their increasing atomic masses represents which law of classification of elements?  

$F, Na, Mg, Al, Si, P, S, Cl$ & $K$
chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. Modern table

  2. Newton's law

  3. Newland's law of octaves

  4. Mendeleev's periodic table

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Correct Option: C
Explanation:

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.

    $F, Na, Mg, Al, Si, P, S, Cl$ & $K$

Law of octaves is given by the English chemist J.A.R. Newlands in 1865.
It states that if chemical elements are arranged according to increasing atomic weight, similar physical and chemical properties occur after each interval of seven elements.

Newlands was the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law.

For which of the pair Newland octave rule is not applicable?

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. $Li,\ Na$

  2. $C,\ Si$

  3. $Mg,\ Ca$

  4. $Cl,\ Br$

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Correct Option: D
Explanation:

According to Newland Octave law, when elements are arranged in increasing atomic mass every eighth element has similar properties to the first element.

Further the law was not applicable to elements of higher atomic masses. So, law was applicable till calcium.
Hence, $Cl,Br$ is not applicable to Newland Octave Rule.

Who presented the law of octave? 

chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

  1. Dobereiner

  2. Newland

  3. Lother Meyer

  4. Mendeleev

Show answer
Correct Option: B
Explanation:
According to Newland's law of octaves, when elements are arranged by increasing atomic mass, the properties of every eighth element starting from any element are a repetition of the properties of the starting element.
Option B is correct.