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Chemistry Chemistry Chemical Kinetics

The results given in the below table were obtained during kinetic studies of the following reaction: 2A + B → C + D
2A + B → C + D

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alok kumar singh

Contributor-Level 10

From I&II, rate∝ [B]². From I&III, rate∝ [A]¹.
From IV: 7.2e-2 = k (X) (0.2)². From II: 2.4e-2=k (0.1) (0.2)². X=0.3.
From V: 2.88e-1=k (0.3) (Y)². k=2.4e-2/ (0.1*0.04)=6.
2.88e-1 = 6 (0.3)Y². Y²=0.16. Y=0.4.

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Chemistry Class 12th

Cast iron is used for the manufacture of:

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alok kumar singh

Contributor-Level 10

Cast iron is used to make wrought iron and steel.

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Chemistry Class 12th

The major product obtained from E?-elimination of 3-bromo-2-fluoropentane is

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alok kumar singh

Contributor-Level 10

E2 elimination. Most acidic proton is removed. Fluorine is more electronegative.

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Chemistry Chemistry Coordination Compounds

Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of Mⁿ⁺ ion are provided below; their λ_max values are marked as A, B and C respectively. The correct match between the complexes and their λ_max values is:

(i) [M(NCS)₆]⁽⁻⁶⁺ⁿ⁾
(ii) [MF₆]⁽⁻⁶⁺ⁿ⁾
(iii) [M(NH₃)₆]ⁿ⁺

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alok kumar singh

Contributor-Level 10

Ligand field strength: NH? > NCS? > F? Stronger ligand, higher Δ, lower λ_max.
So λ (NH? ) < (NCS? ) < (F? ). A= (F? ), B= (NCS? ), C= (NH? ). A-ii, B-i, C-iii.

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Chemistry Class 12th

The correct observation in the following reaction is:

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alok kumar singh

Contributor-Level 10

Seliwanoff's test distinguishes aldoses from ketoses. Sucrose hydrolyzes to glucose (aldose) and fructose (ketose). Fructose gives a red color.

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Chemistry Class 11th

Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is:

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alok kumar singh

Contributor-Level 10

On moving left to right in a period.

Acidic character of oxides is increase.

3rd period element oxides.

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Chemistry Class 12th

Two compounds A and B with same molecular formula (C?H?O) undergo Grignard reaction with methylmagnesium bromide to give products C and D. Products C and D show following chemical tests. C and D respectively are:

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alok kumar singh

Contributor-Level 10

gives iodoform test and slow Lucas test, so it's a methyl secondary alcohol. D gives fast Lucas test, so it's a tertiary alcohol. The Grignard products must be tertiary and secondary alcohols. So A and B must be an aldehyde and a ketone.

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Chemistry Class 11th

Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are:

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