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Byju's Answer

Standard XII

Chemistry

Multiple Bond Formation

Mr. William i...

Question

Mr. William isolated two complexes and in Chemical Abstract, he reported
"A metal complex having composition $C r (N H_{3})_{4} C l_{2} B r$ has been isolated in two forms (A) and (B). The form (A) reacts with $A g N O_{3}$ to give a white precipitate readily soluble in dilute aqueous ammonia, whereas (B) gives a pale yellow precipitate soluble in concentrated ammonia.

Read the above report from Chemical Abstract and answer the questions at the end of it.

Cr atom is ________ hybridised.

s p^{3} d^{2}

in both complexes.

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d^{2} s p^{3}

in both complexes.

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s p^{3} d^{2}

in A and

d^{2} s p^{3}

in B.

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d^{2} s p^{3}

in A and

s p^{3} d^{2}

in B.

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Solution

The correct option is B $d^{2} s p^{3}$ in both complexes.

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Similar questions

Q. A metal complex having composition

C r (N H_{3})_{4} C l_{2} B r

has been isolated in two forms

(A)

and

(B)

. The form

(A)

reacts with

A g N O_{3}

to give a white precipitate readily soluble in dilute aqueous ammonia, whereas

(B)

gives a pale yellow precipitate soluble in concentrated ammonia. Write the formula of

(A)

and

(B)

and state the hybridization of chromium in each. Calculate their magnetic moments (spin- only value).

Q. A metal complex having composition Cr(NH

_{3}

)

_{4}

_{2}

Br has been isolated in two forms A and B. The form A reacts with

A g N O

_{3}

to give a white precipitate readily soluble in dilute aqueous ammonia, whereas B gives a pale-yellow precipitate soluble in concentrated ammonia.The magnetic moments (spin- only value) of A and B are respectively:

Q. Assertion :Transition metal ion forming octahedral complexes undergo

s p^{3} d^{2}

d^{2} s p^{3}

hybridisation. Reason: Strong field ligands force the unpaired electrons of central metal ion to pair up causing

d^{2} s p^{3}

hybridisation whereas weak field ligands do not affect electronic configuration of the metal ion undergoes in

s p^{3} d^{2}

hybridisation.

Q. Consider the following statements and arrange in the order of true/false as given in the codes (T/F) :

S_{1}

S r^{2 +}

ions in very dilute solution do not give yellow precipitate with

C r O_{4}^{2 -}

ions.

S_{2}

C a^{2 +}

ions give a yellow precipitate in presence of ammonia with potassium ferrocyanide solution.

S_{3}

M g^{2 +}

ions in solution gives a gelatinous white precipitate of magnesium hydroxide with ammonia solution and the precipitate is readily soluble in solution and aqua regia.

S_{4}

H g S

forms soluble complex in excess of sulphide.

Q. Assertion :Statement

-

1 : Coordination isomerism occurs when both cation and anion are complex. Reason: Statement

-

2 : The complexes with coordination number 6 form octahedral complexes involving either

s p^{3} d^{2}

d^{2} s p^{3}

hybridization.

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The correct option is B d2sp3 in both complexes.

The correct option is B $d^{2} s p^{3}$ in both complexes.