Posts Tagged ‘Business’

Prepare for AISSCE (CBSE Class XII) Chemistry through selected Long Answer Type Questions – Unit 2 – Solutions

AISSCE (CBSE Class XII) Chemistry through selected Long Answer Type Questions –

 

Unit 2 – Solutions

 

Solution Finding Stimulus-Behave as-if your so...

 

  1. What do you understand by vapour pressure of a liquid? How does it vary with temperature? Using pressure temperature curve show that what is normal boiling point and standard boiling point of a liquid?
  2. What is Vant Hoff’s factor? How is it related to degree of dissociation of the electrolyte in the solution? What is its value when the solute undergoes association?

 

 

 

 

Subscribe by Email

Be the first to comment - What do you think?  Posted by admin - February 12, 2014 at 6:10 pm

Categories: CBSE Chemistry   Tags: , , , , , , ,

CBSE Class 12 Chemistry Sample Paper – HALOALKANES AND HALOARENES

MM : 25                                       TIME : 45 MIN.
1. Give IUPAC names of the following compounds:
(a) CH2=CH-CH – C=CH2
C2H5 Cl
(b) CH3-CH2-CH-C6H5Br
CH3
2. Write the structure of the following organic halogen compounds :
(a) 4-tert-butyl-3-iodoheptane
(b) 2-(2-chlorophenyl)-1-iodooctane
3. Explain the following reaction:
(a) Friedel craft alkylation reaction.
(b) Wurtz reaction
(c) Sandmeyer’s reaction
(d) Finkelstein reaction
4. Convert the following:
(a) Ethane to bromoethene
(b) But-1-ene to but-2-ene
(c) Propene to propyne
(d) Benzyl alcohol to 2-phenylethanoic acid
(e) Aniline to chlorobenzene
5. Explain Markownikoff’s rule with example.
6. Explain the following
(a) Vinyl chloride is hydrolysed more slowly than ethyl chloride
(b) The treatment of alkyl chloride with aqueous KOH leads to the formation of alcohols but in the presence of alcoholic KOH , alkenes are the major products.
7. Distinguish between C2H5Br and C6H5Br through chemical test .
8. What are Enantiomers and Racemic mixtures ?
9. Predict the order of reactivity of the following compounds in SN1 reaction C6H5CH2Br , C6H5CH(C6H5)Br , C6H5CH(CH3)Br , C6H5C(CH3)(C6H5)Br
10. What is chemical name of D.D.T ? How it is prepared ?

 

Be the first to comment - What do you think?  Posted by admin - February 21, 2013 at 1:29 pm

Categories: AISSCE CHEMISTRY, CBSE Chemistry, Chemistry Model Papers   Tags: , , , , , , ,

CBSE Class 12 Chemistry Sample Paper – p- BLOCK ELEMENTS

MM : 30                            TIME : 40 MIN.
1. PCl5 is ionic in nature in solid state .Explain.
2. Out of NH3 and PH3 which one is more basic and why?
3. Explain why nitric oxide shows different behavior in gaseous and liquid state?
4. Explain why both N and Bi do not form pentahalides while phosphorus does ?
5. What is electron gain enthalpy ? Why its value for S is higher than O?
6. SF4 undergo hydrolysis but not SF6 why?
7. Why Fluorine does not exhibit positive oxidation state?
8. What are interhalogen compounds ? Why they are more reactive than halogens ?
9. Addition of Cl2 to KI solution give it a brown colour but excess of Cl2 turns it colourless. Why?
10.Explain why only Xe can form different types of compounds from all noble gases ?
11.Why CO2 exist as a gas but SiO2 act as solid at room temperature ?
12.Explain why SO2 act as oxidising agent as well as reducing agent but SO3 can act as only oxidising agent ?
13.Write balanced equation for the following
(i) NaCl is heated with sulphuric acid in the presence of MnO2 .
(ii) Cl2 gas is passes into a solution of NaI in water .
14.How are XeO3 and XeO4 prepared ?
15.Complete the following equations :
(i) NaOH (aq) + Cl2 ( aq) →
(ii) P4 + NaOH (aq) + H2O→

 

Be the first to comment - What do you think?  Posted by admin - at 1:27 pm

Categories: AISSCE CHEMISTRY, CBSE Chemistry, Chemistry Sample Papers   Tags: , , , , , , ,

CBSE Chemistry Class 12 Sample Paper – ALDEHYDES , KETONES AND CARBOXYLIC ACID

MM : 25                                          TIME : 45 min.
1. Write a chemical equation each to illustrate the following reaction;
(a) Aldol condensation reaction
(b) Cannizzaro reaction
(c) Rosenmund’s reaction
(d) Gattermann – Koch reaction
(e) Clemmensen reduction
2. Convert the following;
(a) Propanone to propene
(b) Propanal to butanone
(c) Benzoic acid to benzaldehyde
(d) Acetone to t-butyl alcohol
(e) Formaldehyde to urotropine
3. Give one chemical test to distinguish Propanal and diethyl ether.
4. Explain why formic acid is more stronger acid than acetic acid ?
5. Explain why carboxylic acid have higher boiling points than alcohols of comparable molecular masses?
6. Why carboxylic acid do not give the characteristic reaction of carbonyl group?
7. Arrange salicylic acid , p-hydroxybenzoic acid , m- hydroxybenzoic acid , benzoic acid in order of increasing acidic strength?
8. Give IUPAC name of Crotonaldehyde .
9. What is Grignard reagent ? How it is used to prepare tertiary butyl alcohol?
10. An alkyl halide when reacts with Aq. NaOH give ‘X’ “X’ in presence of Cu at 573 K gives ‘Y’. ‘Y’ in presence of conc. NaOH gives CH3OH + HCOONa

 

Be the first to comment - What do you think?  Posted by admin - at 1:22 pm

Categories: AISSCE CHEMISTRY, CBSE Chemistry, Chemistry Board Papers, Chemistry Model Papers   Tags: , , , , , , ,

CBSE Chemistry Class 12 Sample Paper – ALCOHOLS , PHENOLS AND ETHERS

MM : 25                                TIME : 45min.
1. Write a chemical equation each to illustrate the following reaction;
(a) Reimer – Tiemann reaction
(b) Kolbe’s reaction
(c) Coupling reaction
(d) Fischer esterification
2. Describe the mechanism of acid dehydration of ethanol to yield ethane.
3. Describe a chemical test to distinguish between Primary, secondary and tertiary alcohols.
4. Convert the following :
a. Cyclohehexanol to cyclohexan-1-one
b. Butan- 1 – ol to Butanoic acid .
c. Ethanol to 3- hydroxybutanal
d. Primary alcohol to an aldehyde
e. Ethanol to acetone
5. Explain why Phenols are much more acidic than alcohols ?
6. Explain why the boiling points of ethers are much lower than those of the alcohols of comparable molar masses?
7. What is absolute alcohol?
8. Compound A reacts with CH3MgBr reacts in presence of water gives Butan-2- ol . Bautan-2-ol in the presence of conc. H2SO4 gives B which reacts with Br2 to form C .C reacts with Alc. KOH gives D . Find A , B, C,D
9. Explain why cleavage of alkyl phenyl ethers with HBr always produces phenol and alkyl bromides and not bromobenzene and alkanols.
10. Convert the following :
(a) Phenol to Benzoquinone
(b) Anisole to Phenol
(c) Phenol to acetophenone

 

Be the first to comment - What do you think?  Posted by admin - at 1:20 pm

Categories: CBSE Chemistry   Tags: , , , , , , ,

Next Page »