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Assertion (A) : The highest oxidation st...

Assertion (A) : The highest oxidation state of osmium is +8.
Reason (R ) : Osmium is a 5d - block element.

A

both (A) and (R ) are true, and (R ) is the correct explanation of (A).

B

both (A) and (R ) are true, but (R ) is not the correct explanation of (A).

C

(A) is false but (R ) is true.

D

(A) and (R ) both are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct Explanation : All of the eight valence electrons of osmium `(5d^(6)6s^(2))` can participate in bonding, because 5d and 6s - electrons have nearly the same energy.
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Knowledge Check

  • In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is give. Choose the correct answer out of the following choices. Assertion (A): Vitamin D can be stored in our body. Reason (R): Vitamin D is fat soluble vitamin.

    A
    (A) and (R) both are correct statement and (R) is correct explanation for (A)
    B
    (A) and (R) both are correct statements but (R) is not correct explanation for (A)
    C
    (A) is correct statement but (R) is wrong statement.
    D
    (A) and (R) both are incorrect statements

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    {:(,IE_(1)+IE_(2),IE_(3)+IE_(4)),("Element",(KJ.mol^(-1)),(KJ.mol^(-1))),(" Ni"," 2.5"," 8.8"),(" Pt"," 2.6"," 6.7"):} Answer the following on the basis of above data - (a) What are the most stable oxidation states of Ni and Pt ? Give reasons. (b) Which one of the given elements will be easily oxidised to + 4 oxidation state ? Why ?

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