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The pair of elements with same electrone...

The pair of elements with same electronegatively and stardard oxidation potential are

A

Mg and Ca

B

Ca and Sr

C

Ca and Ba

D

Ba and Be

Text Solution

Verified by Experts

The correct Answer is:
B
Sr has small size than expected due to poor shielding of d - orbitals, so both `Ca^(+2) and Sr^(+2)` have same hydration energy there by same oxidation potential.
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Oxidation number is the charge which an atom of an element has in its ion or appears to have when present in the combined state. It is also called oxidation state. Oxidation number of any atom in the elementary state is zero. Oxidation number of a monoatomic ion is equal to the charge on it. In compounds of metals with non metals, metals have positive oxidation number while non metals have negative oxidation numbers. In compounds of two difference elements, the more electronegative element has negative oxidation number whereas the other has positive oxidation number. In complex ions, the sum of the oxidation number of all the atoms is equal to the charge on the ion. If a compound contains two or more atoms of the same element, they may have same or different oxidation states according as their chemical bonding is same or different. The oxidation state of the most electronegative element in the products of the reaction between BaO_(2) and H_(2)SO_(4) are

Knowledge Check

  • Pair of elements with equal values of electronegativiy

    A
    Be,Al
    B
    Mg,Al
    C
    Mg,Ca
    D
    F,Ne

  • Elements with high electronegativity are generally

    A
    Good reductants
    B
    Hard solids
    C
    Good oxidants
    D
    Soft solids

  • The most electronegative element is

    A
    Nitrogen
    B
    Oxygen
    C
    Fluorine
    D
    Chlorine
    • AAKASH SERIES-ALKALINE EARTH METALS-LECTURE SHEET (STRAIGHT OBJECTIVE TYPE QUESTIONS
    1. The pair of elements with same electronegatively and stardard oxidatio...

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    2. The magnetic nature of atoms (or) ions of IIA elements is

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    3. Thermal stability of II A carbonates from BeCO(3) to BaCO(3)

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    4. Which of the following not avaible in nature heated

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    5. CO(2) gas is not produced when the following is storngly heated

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    6. When burning magnesium splinter is placed in a jar containing the foll...

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    7. The following salts of II A elements always exist in liquid state

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    8. Which of the following is correct regarding the solubility of alkaline...

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    9. Melting point is highest for

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    10. Which salt gives crimson colour in flame

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    11. Which of the following metallic chloride has covalent character

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    12. The II A carbonate that decomposes at room temperature of 25^(@) C is

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    13. Which of the following hydroxides is the strongest base.

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    14. The compound 'A' on heating gives a colourless gas and a residue. The ...

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    15. The ion having highest mobility in aqueous solution is

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    16. The compounds(s) of alkaline earth metals, which are amphoteric in nat...

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    17. The correct statement is / are

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    18. The compound(s) which have -O-O- bond (s) is / are

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    19. Na(2)SO(4) is water soluble but BaSO(s) is insoluble because

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    20. Which of the following statements are false?

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