Chemistry

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During halogens test, sodium fusion extract is boiled with concentrated HNO₃ to

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Sodium fusion extract is boiled with conc. HNO₃ to remove NaCN and Na₂S.

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Given below are two statements: one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: A mixture contains benzoic acid and naphthalene. THE pure benzoic acid can be separated out by the use of benzene.

Reason R: Benzoic acid is soluble in hot water.

In the light of the above statements, choose the most appropriate answer form the options given below:

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Benzoic acid & naphthalene can be separated by crystallization. Benzoic acid is soluble is hot water but naphthalene is insoluble.

Assertion is incorrect & Reason is correct.

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The metal ion (in gaseous state) with lowest spin-only magnetic moment value is

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Chemistry Chemistry Electrochemistry

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the lowest spin only magnetic moment for Ni⁺² because of minimum unpaired electron.

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The number of bridged oxygen atoms present in compound B formed form the following reaction is $P b {(N O_{3})}_{2} \overset{673 K}{\to} A + P b O + O_{2}$ ${_{}}_{}_{}$

$A \overset{D i m e r i s e}{\to} B$

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Chemistry Chemistry Electrochemistry

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$P b {(N O_{3})}_{2} \to_{673 K}^{Δ} P b O + \underset{(A)}{N O_{2}} + O_{2}$

$\underset{(A)}{N O_{2}} \to_{}^{D i m e r i s e} \underset{(B)}{N_{2} O_{4}}$

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a year ago

The correct order of reduction potentials of the following pairs is

A. Cl ₂/Cl^-

B. I₂/ I^-

C. Ag⁺ / Ag

D. Na⁺ / Na

E. Li⁺ / Li

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$E_{C l_{2} / C l^{-}}^{0} = + 1.36 V$

$E_{l_{2} / l^{-}}^{0} = + 0.54 V$

$E_{A g^{+} / A g}^{0} = + 0.80 V$

$E_{N a^{+} / N a}^{0} = - 2.71 V$

$E_{L i^{+} / L i}^{0} = - 3.05 V$

$∴ E_{C l_{2} / C l^{-}}^{0} > E_{A g^{+} / A g}^{0} > E_{N a^{+} / N a}^{0} > E_{L i^{+} / L i}^{0}$

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AB₃ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is________. (Integer answer)

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Chemistry Chemistry Electrochemistry

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For AB₃ interhalogen compound, which is T-shaped, only two lone pair electrons are available on central atom.

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These are physical properties of an element

(a) Sublimation enthalpy

(b) Ionisation enthalpy

(c) Hydration enthalpy

(d) Electron gain enthalpy

The total number of above properties that affect the reduction potential is__________ (Integer answer)

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Chemistry The d and f Block Elements

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Except electron gain enthalpy all the physical properties like sublimation enthalpy, ionization enthalpy and hydration energy affected the value of reduction potential.

Ans. = 3

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The number of 4f electrons in the ground state electronic configuration of Gd²⁺ is_________.

[Atomic number of Gd = 64]

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Electronic configuration of

Gd is ; Gd₆₄ = [Xe]4f⁷ 5d¹ 6s²

Hence $G d_{64}^{+ +} = [X e] 4 f^{7} 5 d^{1} 6 s^{0}$

Total number of electrons in 4f sub-shell = 7

Ans. = 7

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Chemistry Biomolecules

The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH 12.5 will be_______. (Integer answer)

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