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11 months ago

Chemistry Chemistry Organic Chemistry

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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Vishal Baghel

Contributor-Level 10

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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New answer posted

11 months ago

Chemistry Environmental chemistry

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

Assertion A: Polluted water may have a value of BOD of the order of 17 ppm.

Reason R: BOD is a measure of oxygen required to oxidize both the biodegradable and non-biodegradable organic material in water

In the light of the above statements, choose the most appropriate answer from the options given below.

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Vishal Baghel

Contributor-Level 10

Assertion : Clean water has BOD less than 5ppm. Highly polluted water has BOD greater than or equal to 17 ppm.

Reason : BOD is measure of oxygen required to oxidize only bio-degradable organic matter.

Thus Assertion (A) is correct & Reason (R) is wrong.

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11 months ago

Chemistry Coordination Compounds

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

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Vishal Baghel

Contributor-Level 10

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

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11 months ago

Chemistry Class 12th

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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Vishal Baghel

Contributor-Level 10

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

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

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11 months ago

Chemistry Chemistry Electrochemistry

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

Choose the correct answer from the options given below

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Vishal Baghel

Contributor-Level 10

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

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

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

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

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

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

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New answer posted

11 months ago

Chemistry Chemical Bonding and Molecular Structure

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

Assertion A: The amphoteric nature of water is explained by using Lewis acid/base concept

Reason R: Water acts as an acid with NH₃ and as a base with H₂S

In the light of the above statements choose the correct answer form the options given below:

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Vishal Baghel

Contributor-Level 10

$\underset{(a c i d)}{H_{2} S} + \underset{B a s e}{H_{2} O} ? H_{3} O^{+} + H S^{-}$

$\underset{(a c i d)}{H_{2} O} + \underset{(B a s e)}{N H_{3}} ? N H_{4} O H$

With H₂S water acts like base and with NH₃ it acts like acid.

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11 months ago

Chemistry Class 12th

Given below are two statements.

Statement I: During electrolytic refining, blister copper deposits precious metals.

Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the correct answer form the option given below:

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Vishal Baghel

Contributor-Level 10

In electro-refining, impure metal (blister copper) is used as an anode while precious metal like Au, Pt gets deposited as anode mud.

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11 months ago

Chemistry Periodic Table Elements

The correct order of electron gain enthalpies of Cl, F, Te and Po is

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Vishal Baghel

Contributor-Level 10

Element e^- gain enthalpy

F -333

Cl -349

Te -190

Po &nb

...more

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11 months ago

Chemistry Biomolecules

Match List I with List II

List I List II

A. Zymase I. Stomach

B. Diastase

...more

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Vishal Baghel

Contributor-Level 10

Zymase naturally occurs in yeast.

Diastase is found in malt.

Urease is found in soyabean.

Pepsin is found in stomach.

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11 months ago

Chemistry Class 12th

The Ksp for bismuth sulphide (Bi₂S₃) is 1.08 * 10^-73. The solubility of Bi₂S₃ in mol L^-1 at 298 K is

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Vishal Baghel

Contributor-Level 10

$B i_{2} S_{3} ? {\underset{2 S}{2 B i}}^{+ 3} + {\underset{3 S}{3 S}}^{- 2}$

$K s p = {(2 S)}^{2} {(3 S)}^{3} = 4 * 27 * {(S)}^{5}$

= 108 (S)5

${(S)}^{5} = \frac{1.08 * 1 0^{- 73}}{108} = 1 0^{- 75}$ $∴ S = 1 0^{- 15} M$

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