Ncert Solutions Chemistry Class 12th

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

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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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o Chlorophyll: Magnesium present in chlorophyll.

o Vitamin B? : Cobalt (cyanocobalamin).

o Anticancer drug: Platinum (Coordination compound of platinum).

o Grubbs catalyst: Ruthenium.

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The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

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When we add cryolite (Na? AlF? ) in the extraction of aluminium, the melting point of alumina decreases

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Compound with molecular formula C?H?O can show:

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Functional group isomers

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Match List – I with List – II
List – I List – II
(a) Haematite (i) Al2O3.xH2O
(b) Bauxite (ii) Fe2O3
(c) Magnetite (iii) CuCO3.Cu(OH)2
(d) Malachite (iv) Fe3O4
Choose the correct answer from the opt

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Haematite: Fe? O?

Bauxite: Al? O? ·xH? O

Magnetite: Fe? O?

Malachite: CuCO? ·Cu (OH)?

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Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of :

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Reaction Sequence:

o NO? + CH? COOH → HNO? + CH? COO?

o Sulphanilic acid (+ NH? CH? COO? ) + HNO? → N-acetylated diazonium intermediate + 2H? O

The intermediate + another molecule → Red Azodye + NH? + CH? COOH

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KBr is doped with 10⁻⁵ mole percent of SrBr₂. The number of cationic vacancies in 1 g of KBr crystal is ______ 10¹⁴. (Round off to the nearest integer).
[Atomic Mass: K: 39.1 u, Br: 79.9 u, NA = 6.023 *10²³]

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