Ncert Solutions Chemistry Class 12th

In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M, the concentration of sodium acetate in the buffer is _____ M. (Round off to the nearest integer).
[Given: pKa (acetic acid) = 4.74]

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For an acidic buffer solution, pH = pKa + log ( [Base]/ [Acid]).

Given pH = 5.74 and pKa = 4.74.

5.74 = 4.74 + log ( [Base]/1).

1 = log ( [Base]).

[Base] = 10M.

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Please consider the following Image

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In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

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o Let the number of atoms of element A be N.

o Tetrahedral voids = 2N.

o Atoms of element M = (2/3) * 2N = 4/3 N.

o The ratio M : A is (4/3 N) : N, which simplifies to 4:3.

o So, the formula of the compound is M? A?

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In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

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The correct structures of trans-[NiBr?(PPh?)?] and meridional-[Co(NH?)?(NO?)?], respectively, are:

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Please consider the following Image

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In the above reactions, the enzyme A and enzyme B respectively are:
C₁₂H₂₂O₁₁ (Sucrose) + H₂O --(Enzyme A)--> C₆H₁₂O₆ (Glucose) + C₆H_12O6(Fructose)
C₆H₁₂O₆ --(Enzyme B)--> 2C₂H₅OH + 2CO₂

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Inversion of Sucrose:
C? H? O? (Sucrose) + H? O - (Invertase)-> C? H? O? (Glucose) + C? H? O? (Fructose)

Fermentation of Glucose:
C? H? O? (Glucose) - (Zymase)-> 2C? H? OH (Ethanol) + 2CO?

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Given below are two statements:
Statement I: 2-methylbutane on oxidation with KMnO4 gives 2-methylbutan-2-ol.
Statement II: n-alkanes can be easily oxidised to corresponding alcohols with KMnO4.
Choose the correct option:

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KMnO? oxidizes alkanes that contain a tertiary hydrogen (3°H) to form tertiary alcohols.

n-alkanes, which do not contain tertiary hydrogens, are not oxidized by KMnO? under these conditions.

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Match List – I with List – II:
List – I List – II
(a) [Co(NH3)6][Cr(CN)6] (i) Linkage isomerism
(b) [Co(NH3)3(NO2)3] (ii) Solvate isomerism
(c) [Cr(H2O)6]Cl3 (iii) Co-ordination isomerism
(d) cis - [CrCl2(ox)2]³? (iv) Opt

...more

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Co (NH? )? ] [Cr (CN)? ]: Co-ordination isomerism

[Co (NH? )? (NO? )? ]: Linkage isomerism

[Cr (H? O)? ]Cl? : Solvate isomerism

Cis- [CrCl? (Ox)? ]³? : Optical isomerism

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The correct pair(s) of the ambident nucleophiles is (are):
(A) AgCN / KCN
(B) RCOOAg / RCOOK
(C) AgNO2 / KNO2
(D) Agl / KI

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CN? and NO? are examples of ambident nucleophiles.

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Match List - I with List - II
List - I
(a) Chlorophyll
(b) Vitamin B?
(c) Anticancer drug
(d) Grubbs catalyst

List - II
(i) Ruthenium
(ii) Platinum
(iii) Cobalt
(iv) Magnesium

Choose the most appropriate answer from the options given below:

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