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Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

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Chemistry
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Write the main product formed when propanal reacts with the following reagents: 
2 moles of 3 CH OH in presence of dry HCl 

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Write the main product formed when propanal reacts with the following reagents: 
H2N- NH2  followed by heating with KOH in ethylene glycol.

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

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 Acetone, Acetaldehyde, Benzaldehyde, Acetophenone – reactivity towards addition of HCN. 

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
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For a reaction
\[\ce{2H2O2->[I^-][Alkaline medium]2H2O + O2}\]

The Proposed mechanism is given below: 
(1) H2O2+I- → H2O+IO-(slow)
(2) H2O2+IO-→H2O+I-+O2(fast)

(i) Write the rate law for the reaction.
(ii) Write the overall order of a reaction.
(iii) Out of steps(1) and (2), which one is the rate-determining step? 

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
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Write IUPAC name of the complex [Pt(en)2Cl2]. Draw structures of geometrical isomers for this complex. 

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
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Write chemical reactions taking place in the extraction of copper from Cu2 S. 

[6] General Principles and Processes of Isolation of Elements
Chapter: [6] General Principles and Processes of Isolation of Elements
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Is   a homopolymer or copolymer? Give reason. 

[15] Polymers
Chapter: [15] Polymers
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Why the use of alitame as an artificial sweetener is not recommended? 

[16] Chemistry in Everyday Life
Chapter: [16] Chemistry in Everyday Life
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How will you convert the following:
Zinc blende to Zinc metal

[6] General Principles and Processes of Isolation of Elements
Chapter: [6] General Principles and Processes of Isolation of Elements
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Why the use of alitame as an artificial sweetener is not recommended?

[16] Chemistry in Everyday Life
Chapter: [16] Chemistry in Everyday Life
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Write equations of the following reactions:
Carbyl amine reaction

[9] Amines
Chapter: [9] Amines
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Define the following term:

Oligosaccharides

[10] Biomolecules
Chapter: [10] Biomolecules
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Coordination number of hcp and ccp is ____________.

[1] Solid State
Chapter: [1] Solid State
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Which of the following lattices has the highest packing efficiency?

[1] Solid State
Chapter: [1] Solid State
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In cubic close packing (ccp) arrangement, the pattern of the successive layers will be designated as ____________.

[1] Solid State
Chapter: [1] Solid State
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When measuring conductivity with a conductivity cell, cell constant denoted by the symbol G* is given by (electrode area of cross-section equal to ‘A’ and separated by distance ‘l’)

[2] Electrochemistry
Chapter: [2] Electrochemistry
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Substance that enhances the activity of a catalyst is known as ____________.

[5] Surface Chemistry
Chapter: [5] Surface Chemistry
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The impurity that is added externally to remove the impurity already present in the ore is known as ____________.

[6] General Principles and Processes of Isolation of Elements
Chapter: [6] General Principles and Processes of Isolation of Elements
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Which among the following is an ambidentate ligand?

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Which of the following pair contains a complex salt and double salt respectively?

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined
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