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Block D and F Elements

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5 months ago

Block D and F Elements Class 12th

If ${[C u {(H_{2} O)}_{4}]}^{2 +}$ absorbs a light of wavelength 600nm d-d transition, then the value of octahedral crystal field splitting energy for ${[C u {(H_{2} O)}_{6}]}^{2 +}$ will be_________* 10^-^21J. (Nearest Integer)

(Given: h = 6.63 * 10^-³⁴ Js and c = 3.08 * 10⁸ ms^-¹)

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Payal Gupta

Contributor-Level 10

$Δ_{t} = \frac{h c}{λ} = \frac{6.63 * 1 0^{- 34} * 3.08 * 1 0^{8}}{600 * 1 0^{- 9}}$

$= \frac{6.63 * 3.08 * 1 0^{- 17}}{600}$ J

$= 765.765 * 1 0^{- 21} J$

$? 766 * 1 0^{- 21}$ J

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Block D and F Elements Class 12th

Among the following, which is the strongest oxidizing agent?

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Payal Gupta

Contributor-Level 10

$E_{M n^{+ 3} / M n^{+ 2}}^{o} = 1.51 V$

the strongest oxidizing agent have the highest reduction potential. So Mn³⁺ is the strongest oxidizing agent.

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Block D and F Elements Class 12th

Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?

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Payal Gupta

Contributor-Level 10

Cerium exists in two oxidation states (+3) and (+4)

$\begin{array}{l} C e^{+ 4} + e^{-} \to C e^{+ 3} E^{0} = 1.61 V \\ C e^{+ 3} + 3 e^{-} \to C e E^{0} = - 2.336 V \end{array}$

It exist as Ce+4 and acts like a strong oxidizing agent by gaining electrons

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Block D and F Elements Class 12th

Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ____________.

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Payal Gupta

Contributor-Level 10

In acidic solution

$3 \overset{+ 6}{M n} O_{4}^{2 -} + 4 H^{+} \to 2 \overset{+ 7}{M n} O_{4}^{-} + \overset{+ 4}{M n} O_{2} + 2 H_{2} O$

Difference in oxidation state of Mn is product

= 7 – 4 = 3

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Block D and F Elements Class 12th

The difference in oxidation state of chrominum in chromate and dichromate salts is _________.

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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Block D and F Elements Class 12th

The difference in oxidation state of chrominum in chromate and dichromate salts is _________.

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Block D and F Elements Class 12th

Transition metal complex with highest value of crystal field splitting $(Δ_{0})$ will be

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alok kumar singh

Contributor-Level 10

The value of crystal field spilitting energy $_{}$ $(Δ_{0})$ increases down the group. 5d series member will have more $_{}$ $Δ_{0}$ compared to 3d series or 4d series member.

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Block D and F Elements Class 12th

During the qualitative analysis of salt with cation y²⁺, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y²⁺) present represent respectively are:

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