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In Mendeleev's periodic table some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is:

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Important Questions on Classification of Elements and Periodicity in Properties

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
The neutral oxide among the following is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification

Identify the incorrect match.

Name IUPAC Official Name
(a) Unnilunium (i) Mendelevium
(b) Unniltrium (ii) Lawrencium
(c) Unnilhexium (iii) Seaborgium
(d) Unununium (iv) Darmstadtium
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is
Given v= Frequency of X-ray emitted
         Z= Atomic number
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
The atomic number of the element unnilennium is :
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Which of the given atoms has the greatest electron affinity?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Mendeleev's periodic law states that the properties of elements are a periodic function of their
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification

It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power 'n' i.e. vn of X-rays emitted is plotted against atomic number Z, the following graph is obtained.

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The value of 'n' is

 

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Which of the following is a metalloid?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
In which of the following options, the law of triad is applicable?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Which one of the following statements for D.I. Mendeleev, is incorrect ?
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
The atomic weights of "Be" and "In" were corrected by Mendeleev using the formula
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Mendeleev's periodic table is based on atomic masses of elements. It was the first successful attempt to classify all the known elements (63) that time. One of the most importance advantage of this classification was that Mandeleev predicated the physical and chemical properties of three elements: Eka - boron, Eka - silicon and Eka - aluminium. These elements were discovered as
HARD
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Match the following
List – I List – II
A) Rubedium I) Germanium
B) Platinum II) Radio active chalcogen
C) Ekasilicon III) S-block element
D) Polonium IV) Atomic number 78
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
How many elements were known when Mendeleev presented the periodic table ?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
The most significant contribution towards the development of periodic table was made by
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
The number of elements known when Mendeleev presented periodic table is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Mendeleev's Periodic Table is upset by the fact that
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
How many elements were known when Mendeleev presented the periodic table ?
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Genesis of Periodic Classification
Mendeleef's Periodic Table is upset by the fact that