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Q.2 What is peptization ?
Q.3 Write the balanced equation:
Q 4 Why is chioroacetic acid stronger than acetic acid?
Q 5 Why is Frenkel defect found in AgCI?
Q.6 What is the Van’t Hoff factor for a compound which undergoes tetramerization in an
organic solvent?
Q.7 Suggest a condition under which magnesium could reduce alumina.
Q.8 Predict the shape of CIF3 on the basis of VSEPR theory.
Q. Ethylene glycol (molar mass =62 gmoV) is a common automobile antifreeze. Calculate the freezing point of a solution containing 12.4g of this substance in 100g of water. Would it be advisable to keep thin substance in the car radiator during summer.
Q.10
i) Predict the order of the reaction.
ii) Derive the expression for the time required for the completion of the reaction.
Q.11 Write the nerst equation and calculate e.m.f of the following cell at 298k
Q.12 What is the difference between a nucleoside and a nucleotide?
Q.13 State the difference between the following;
I) A globular protein and fibrous protein
ii) Primary and secondary structure of a proteins.
Q.14 In the following pair of halogen compounds. which compound undergoes faster S,
reaction?
0.15 Complete and name the following reactions
Q.16 Give chemical test to distinguish between compounds in each at the following pairs
i) Phenol and Benzyl Alcohol.
ii) 2-Butanol and 2—Methylpropan-2-ol
Q.17 Predict giving reasons, the order of basicity of the foilowing compounds in i) gaseous phase (ii) in aqueous solutions
(CH1)3N , (CH3)2 NH CHJNH , NH
OR
Account the following
i) Aniline does not undergo Friedel crafts alkylation
ii) Although —NH2 group is an ortho and para directing gi cups. nitration of aniline
gives metaderivative aiso along with ortho and para derivatives.
Q.18 a) Explain why oxygen molecule has the formula O while sulphur has S,. 2
Q.18 b) Why do noble gases form compounds only with F and 02,
0.19 An element x with an atomic mass of has 60g/mol has Density of 623gm cm3. If the edge
length of its cubic unit cell is 400pm. Identify the type of cubic unit cell, Calcute the
radius of atom of this element.
Q.20 How is Nylon 6-6 synthesized ? Write the chemical reaction for the reaction involved.
Q.2 1 a) Arranged HCIO,HCIO3,HCIO2 and HCIO4 in order of increasing acidic strength?Give reason for your answer.
.21 b) Why does NC I5, not exist?
Q.22 Prove that
for a first order reaction.
Q.23 Write short notes on the following
i) Coupling reaction.
ii) Aldol condensation
iii) Kolbes reaction
Q.24 a) Why is NH3 good complexing agent?
b) Why does PCI3 fume in moisture?
c) ICI is more reactive than i2. Why?
Q.25 a) Give IUPAC name of K3[Cr( C204)3]
b) Give the no of unpaired electron in the following complex ions
[FeF6]4- and [Fe(CN)6]4-
C) Name the isomerism exhibited by the following pair of complex comounds
[Co (NH3)5 Br]S04 and [Co (NH3)6. S04]Br
Give one chemical test to distinguish between these two compounds.
Q.26 a) What is the difference between multimolecular :ii macromolecular colloids9
b) State Hardy Schulze rule.
0.27 a) How do antiseptics differ from disinfectant. Givee one example of each
b) what is tincture of iodine? What is its use?
Q.28 a) Write the chemcal equations for the following conversions: 3+2=5
i) Aniline to ch!orobenzene
II) Phenol to benzoic acid
III) Formaldehyde to acetaldehyde
b) An organic compound A with molecular formula C5H3O2 is reduced to n-pentane
on treatment with Zn-Hg HCI. A forms a dioxime with hydroxylamine and gives
a positive lodoform text and Tollens reagent test. Identify the compound A and
deduce its structure .
OR
a) Complete the following reaction
C6H5NH2 +H2s04 =
Subject - Chemistry Class - XII
Time: 3 Hrs. M.M. : 70
General Instructions:
a) All the questions are Compulsory
b) Question Numbers I to 8 are very short answer questions and carry 1 mark each
c) Question Numbers 9 to 18 are short answer questions and carry 2 marks each. d) Question Numbers 19 to 27 are also short answer questions and carry 3 marks each.e) Question Numbers 28 to 30 are long questions and carry 5 ,marks each.f) Use log tables if necessary. use of calculators is not allowed.
Time: 3 Hrs. M.M. : 70
General Instructions:
a) All the questions are Compulsory
b) Question Numbers I to 8 are very short answer questions and carry 1 mark each
c) Question Numbers 9 to 18 are short answer questions and carry 2 marks each. d) Question Numbers 19 to 27 are also short answer questions and carry 3 marks each.e) Question Numbers 28 to 30 are long questions and carry 5 ,marks each.f) Use log tables if necessary. use of calculators is not allowed.
Q.1 Give the IUPAC name of the following organic compound.
Q.2 What is peptization ?
Q.3 Write the balanced equation:
Q 4 Why is chioroacetic acid stronger than acetic acid?
Q 5 Why is Frenkel defect found in AgCI?
Q.6 What is the Van’t Hoff factor for a compound which undergoes tetramerization in an
organic solvent?
Q.7 Suggest a condition under which magnesium could reduce alumina.
Q.8 Predict the shape of CIF3 on the basis of VSEPR theory.
Q. Ethylene glycol (molar mass =62 gmoV) is a common automobile antifreeze. Calculate the freezing point of a solution containing 12.4g of this substance in 100g of water. Would it be advisable to keep thin substance in the car radiator during summer.
Q.10
i) Predict the order of the reaction.
ii) Derive the expression for the time required for the completion of the reaction.
Q.11 Write the nerst equation and calculate e.m.f of the following cell at 298k
Q.12 What is the difference between a nucleoside and a nucleotide?
Q.13 State the difference between the following;
I) A globular protein and fibrous protein
ii) Primary and secondary structure of a proteins.
Q.14 In the following pair of halogen compounds. which compound undergoes faster S,
reaction?
0.15 Complete and name the following reactions
Q.16 Give chemical test to distinguish between compounds in each at the following pairs
i) Phenol and Benzyl Alcohol.
ii) 2-Butanol and 2—Methylpropan-2-ol
Q.17 Predict giving reasons, the order of basicity of the foilowing compounds in i) gaseous phase (ii) in aqueous solutions
(CH1)3N , (CH3)2 NH CHJNH , NH
OR
Account the following
i) Aniline does not undergo Friedel crafts alkylation
ii) Although —NH2 group is an ortho and para directing gi cups. nitration of aniline
gives metaderivative aiso along with ortho and para derivatives.
Q.18 a) Explain why oxygen molecule has the formula O while sulphur has S,. 2
Q.18 b) Why do noble gases form compounds only with F and 02,
0.19 An element x with an atomic mass of has 60g/mol has Density of 623gm cm3. If the edge
length of its cubic unit cell is 400pm. Identify the type of cubic unit cell, Calcute the
radius of atom of this element.
Q.20 How is Nylon 6-6 synthesized ? Write the chemical reaction for the reaction involved.
Q.2 1 a) Arranged HCIO,HCIO3,HCIO2 and HCIO4 in order of increasing acidic strength?Give reason for your answer.
.21 b) Why does NC I5, not exist?
Q.22 Prove that
for a first order reaction.
Q.23 Write short notes on the following
i) Coupling reaction.
ii) Aldol condensation
iii) Kolbes reaction
Q.24 a) Why is NH3 good complexing agent?
b) Why does PCI3 fume in moisture?
c) ICI is more reactive than i2. Why?
Q.25 a) Give IUPAC name of K3[Cr( C204)3]
b) Give the no of unpaired electron in the following complex ions
[FeF6]4- and [Fe(CN)6]4-
C) Name the isomerism exhibited by the following pair of complex comounds
[Co (NH3)5 Br]S04 and [Co (NH3)6. S04]Br
Give one chemical test to distinguish between these two compounds.
Q.26 a) What is the difference between multimolecular :ii macromolecular colloids9
b) State Hardy Schulze rule.
0.27 a) How do antiseptics differ from disinfectant. Givee one example of each
b) what is tincture of iodine? What is its use?
Q.28 a) Write the chemcal equations for the following conversions: 3+2=5
i) Aniline to ch!orobenzene
II) Phenol to benzoic acid
III) Formaldehyde to acetaldehyde
b) An organic compound A with molecular formula C5H3O2 is reduced to n-pentane
on treatment with Zn-Hg HCI. A forms a dioxime with hydroxylamine and gives
a positive lodoform text and Tollens reagent test. Identify the compound A and
deduce its structure .
OR
a) Complete the following reaction
C6H5NH2 +H2s04 =
