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Chemistry Chemistry Coordination Compounds

Consider the following two statements.

Statement I: [Ni(H₂O)6]²⁺ is of green colour

Statement II: [Ni(CN)₄]^2– is colourless

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alok kumar singh

Contributor-Level 10

[Ni (H₂O)₆]²⁺ Þ Ni²⁺ is octahedral and [Ni (CN)₄]^2– is square planar.

In [Ni (H₂O)₆]²⁺ Þ Ni²⁺ has two unpaired electrons and in [Ni (CN)₄]^2– Þ Ni²⁺ has no unpaired electrons. [Ni (H₂O)₆]²⁺ is coloured as it absorbs red light due to suitable d-d transition and complementary light emitted is green.

[Ni (CN)₄]^2– has strong field ligand so the electrons of Ni²⁺ pair up and it is colourless as it cannot absorb light from visible region.

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9 months ago

Chemistry Class 11th

Select the incorrect statement among the following

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alok kumar singh

Contributor-Level 10

PbS + 4H₂O_2->PbSO₄ + 4H₂O.

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Chemistry Thermodynamics

Which among the following is not a state function?

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alok kumar singh

Contributor-Level 10

Work depends on the path followed by the system so work is path function.

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Chemistry Class 11th

A gas at 300 K and 10 bar has molar volume 10% more than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

Since V_Real> V_ideal

So, Z = V_Real > 1. V_ideal

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Chemistry Class 12th

Assertion (A): KCN react with R-X to give cyanide and AgCN reacts with R - X to give isocyanide mainly.

Reason (R): KCN and AgCN both are ionic compounds

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alok kumar singh

Contributor-Level 10

KCN + CN^–

R – X + KCN R – CN + KX

R – X + AgCN R – NC + AgX

KCN is ionic therefore ionised and attack occurs through carbon.

AgCN is covalent therefore attack starts with Nitrogen.

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Chemistry Class 11th

The number of moles of K₂Cr₂O₇ that will be needed to react with one mole of nitrite ion in acidic solution is

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alok kumar singh

Contributor-Level 10

meq. of K₂Cr₂O₇= meq. of NO^–₂

n₁ * 6 = 1 * 2

n₁=1/3

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Chemistry Structure of Atom

The energies E₁ and E₂ of two radiations are 100 kJ and 200 kJ respectively. The relation between their frequencies i.e. n₁ and n₂ will be

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alok kumar singh

Contributor-Level 10

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Chemistry Chemistry Thermodynamics

We have a mixture of gases having 2 moles of monoatomic $(C_{v, m} = \frac{3 R}{2})$ gas and 6 moles of diatomic gas $(C_{v, m} = \frac{5 R}{2})$ . Find out molar heat capacity (C_nm) of the mixture.