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What are Anomalous pairs of elements in Mendeleev's periodic table?

Important Questions on Classification of elements - The periodic table

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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table

Write merits of Mendeleev's periodic table. 

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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
An example for Mendeleev’s anomalous series is _____
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
What were the criteria used by Mendeleev in creating his Periodic Table?
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table

Give any two limitations of Mendeleev's periodic classification.

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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table

Why do you think the noble gases are placed in a separate group? 

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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
State two demerits of Mendeleev's classification of elements.
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Use Mendeleev's Periodic table to predict the formulae for the oxides of the following elements: K, C, Al, Si
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table

Use Mendeleev's Periodic Table to predict the formulae for oxides of the following elements: 

K and Al. 

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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
List any three observations which posed a challenge to Mendeleev’s Periodic law.
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Write two anomalies of Mendeleev's classification of elements.
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Which of the following is not a noble gases?
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
List two main achievements of Mendeleev's periodic table.
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Why Mendeleev did not mention about inert gases?
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
There were a few irregular trends in the increasing atomic masses when moved along the elements in Mendeleev's periodic table. 
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
The correct formula of the oxide of Eka-aluminium element predicted by Mendeleev was:
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
The main drawback of Mendeleev’s Periodic Table was:
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Describe two anomalies of Mendeleev’s periodic classification of elements.
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Give the demerits of Mendeleev's periodic table.
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Science>Chemistry>Classification of elements - The periodic table>Mendeleev's Periodic Table
Looking at the resemblance to alkali metals and the halogen family, try to assign hydrogen a correct position in Mendeleev's periodic table. To which group and period hydrogen can be assigned.