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Classs 11 Sample paper, Study notes of Chemistry

Chemistry

Chemistry paper Class 11. Sample Papers

Typology: Study notes

2019/2020

Uploaded on 01/02/2020

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Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in
Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks
Sample Paper-02
Chemistry (Theory)
Class – XI
Time allowed: 3 hours Maximum Marks: 70
General Instructions:
a) All the questions are compulsory.
b) There are 26 questions in total.
c) Questions 1 to 5 are very short answer type questions and carry one mark each.
d) Questions 6 to 10 carry two marks each.
e) Questions 11 to 22 carry three marks each.
f) Questions 23is value based question carrying four marks.
g) Questions 24to 26 carry five marks each.
h) There is no overall choice. However, an internal choice has been provided in one question of
two marks, one question of three marks and all three questions in five marks each. You have
to attempt only one of the choices in such questions.
i) Use of calculators is not permitted. However, you may use log tables if necessary.
1. What will be the volume of ammonia formed if 2L of nitrogen is mixed with 2L of hydrogen at
constant temperature and pressure?
2. Give two examples of state functions.
3. Why the molar enthalpy of vapourisation of acetone is less than that of water?
4. How many electrons are present in 16g of methane?
5. How many grams of Na
2
CO
3
should be dissolved to make 100cc of 0.15M Na
2
CO
3
?
6. Which of these electrons experience lowest effective nuclear charge?
(a) The Br atom containing 35 electrons in which 6 electrons are in 2p orbital or
(b) 6 electrons in 3p orbital and 5 electrons in 4p orbital.
7. Write structural formulas of the following compounds :
(a) 3, 4, 4, 5–Tetramethylheptane
(b) 2,5-Dimethyhexane
Or
Write the structural formula of:
(a) O-Ethylanisole
(b) 2,3 - Dibromo -1 - phenylpentane
8. (a) How change in velocity of a moving particle change the wavelength of the particle?
(b) Give the difference in the angular momentum of an electron present in 3p and 4p
orbitals?
9. What is hydride gap? Why is heavy water used in nuclear reactors?
10. Though carbon dioxide is inert and harmless gas, it is thought to be a serious pollutant. Why?
pf3
pf4

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Download Classs 11 Sample paper and more Study notes Chemistry in PDF only on Docsity!

Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in

Sample Paper- Chemistry (Theory) Class – XI

Time allowed: 3 hours Maximum Marks: 70 General Instructions:

a) All the questions are compulsory. b) There are 26 questions in total. c) Questions 1 to 5 are very short answer type questions and carry one mark each. d) Questions 6 to 10 carry two marks each. e) Questions 11 to 22 carry three marks each. f) Questions 23 is value based question carrying four marks. g) Questions 24 to 26 carry five marks each. h) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions in five marks each. You have to attempt only one of the choices in such questions. i) Use of calculators is not permitted. However, you may use log tables if necessary.

  1. What will be the volume of ammonia formed if 2L of nitrogen is mixed with 2L of hydrogen at constant temperature and pressure?
  2. Give two examples of state functions.
  3. Why the molar enthalpy of vapourisation of acetone is less than that of water?
  4. How many electrons are present in 16g of methane?
  5. How many grams of Na 2 CO 3 should be dissolved to make 100cc of 0.15M Na 2 CO 3?
  6. Which of these electrons experience lowest effective nuclear charge? (a) The Br atom containing 35 electrons in which 6 electrons are in 2p orbital or (b) 6 electrons in 3p orbital and 5 electrons in 4p orbital.
  7. Write structural formulas of the following compounds : (a) 3, 4, 4, 5–Tetramethylheptane (b) 2,5-Dimethyhexane Or Write the structural formula of: (a) O-Ethylanisole (b) 2,3 - Dibromo -1 - phenylpentane
  8. (a) How change in velocity of a moving particle change the wavelength of the particle? (b) Give the difference in the angular momentum of an electron present in 3p and 4p orbitals?
  9. What is hydride gap? Why is heavy water used in nuclear reactors?
  10. Though carbon dioxide is inert and harmless gas, it is thought to be a serious pollutant. Why?

Material downloaded from Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

  1. (a)Give the importance of measuring BOD of a water body (b) What is desirable concentration of fluoride ion pH of drinking water? (c) Give the harmful effect of nitrogen dioxide.
  2. (a)Define: (i) Intensive properties (ii) Adiabatic process (b) Derive ∆G=–T∆Stotal from the relationship
  3. We know that 75% of solar energy reaching the earth, is absorbed by earth’s surface increases its temperature. The rest of heat radiates back to the atmosphere. Some of the heat is trapped by gases such as CO, CH This causes global warming. (a) Suggest some measures to decrease CO gas in the atmosphere. (b) Give a method to save ozone layer. (c) Will the use of solar energy solve our problems? Comment.
  4. Comment on the graph below.
  5. If the density of 3M solution of NaCl is 1.25g/mL, calculate the molality of the solution.
  6. Calculate the standard enthalpy of formation of one mole of CH one mole of methanol takes place at 298 K and 1 atm and after combustion CO (l) are produced and 726 kJ of heat is liberated. Assume that the standard enthalpies of formation of CO 2 (g) and H 2 O (l) are
  7. What are the uses of sodium carbonate?
  8. Describe in detail the expanded octet with suitable exam
  9. How would you prepare alkanes from alkenes?
  10. (a) Calculate the concentration of hydroxyl ion in 0.1 M solution of ammonium hydroxide having Kb = 1.8 × 10 −^5 , if Ksp value of two sparingly soluble salts Ni (OH) 2 × 10 −^15 and 6.0 × 10 −^17 respectively. (b) Which salt is more soluble? (a) When certain buffer is made by mixing sodium formate and formic acid in water, explain how it neutralizes an addition of a small amount of an acid or a base. (b) When a basic buffer is made by mixing ammonium hydroxide and ammonium nitrate in water, explain how it resists change in its pH on addition of a small amount of an acid or a base.
  11. Give the names and formulae of the compounds in the statements given below:

Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

(a)Give the importance of measuring BOD of a water body. What is desirable concentration of fluoride ion pH of drinking water? Give the harmful effect of nitrogen dioxide.

from the relationship G=H – TS. 75% of solar energy reaching the earth, is absorbed by earth’s surface increases its temperature. The rest of heat radiates back to the atmosphere. Some of the heat is trapped by gases such as CO, CH 4 , O 3 , CFC’s and water vapours present in the atmosphere. Suggest some measures to decrease CO gas in the atmosphere. Give a method to save ozone layer. Will the use of solar energy solve our problems? Comment.

of NaCl is 1.25g/mL, calculate the molality of the solution. Calculate the standard enthalpy of formation of one mole of CH 3 OH (l), if the combustion of one mole of methanol takes place at 298 K and 1 atm and after combustion CO produced and 726 kJ of heat is liberated. Assume that the standard enthalpies of O (l) are - 393 kJ/mol and -286 kJ mol respectively. What are the uses of sodium carbonate? Describe in detail the expanded octet with suitable examples. How would you prepare alkanes from alkenes? Calculate the concentration of hydroxyl ion in 0.1 M solution of ammonium hydroxide value of two sparingly soluble salts Ni (OH) respectively. Which salt is more soluble? Or When certain buffer is made by mixing sodium formate and formic acid in water, explain how it neutralizes an addition of a small amount of an acid or a base. When a basic buffer is made by mixing ammonium hydroxide and ammonium nitrate in water, explain how it resists change in its pH on addition of a small amount of an acid or a Give the names and formulae of the compounds in the statements given below:

http://onlineteachers.co.in

75% of solar energy reaching the earth, is absorbed by earth’s surface increases its temperature. The rest of heat radiates back to the atmosphere. Some of the heat , CFC’s and water vapours present in the atmosphere.

of NaCl is 1.25g/mL, calculate the molality of the solution. OH (l), if the combustion of one mole of methanol takes place at 298 K and 1 atm and after combustion CO 2 (g) and H 2 O produced and 726 kJ of heat is liberated. Assume that the standard enthalpies of 286 kJ mol respectively.

Calculate the concentration of hydroxyl ion in 0.1 M solution of ammonium hydroxide value of two sparingly soluble salts Ni (OH) 2 and AgCN are

When certain buffer is made by mixing sodium formate and formic acid in water, explain

When a basic buffer is made by mixing ammonium hydroxide and ammonium nitrate in water, explain how it resists change in its pH on addition of a small amount of an acid or a Give the names and formulae of the compounds in the statements given below:

Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in

by various methods. It is used in the commercial preparation of acetic acid, ethyl acetate etc. Paraldehyde, a trimer of aldehyde is used as hypnotic. (a) Give the best method to prepare acetaldehyde. Give two reasons. (b) Give the chemical equation for Wacker’s process of preparation of acetaldehyde. (c) Give the disadvantage of preparing it from ethyne.

  1. Give the net ionic equation for the reaction of potassium dichromate (VI) with sodium sulphite in an acid solution to give chromium (III) ion and the sulphate ion. Or Explain the reason for the following reactions to proceed differently. Pb 3 O 4 + 8 HCl 3 PbCl 2 + Cl 2 + 4 H 2 O and Pb 3 O 4 + 4 HNO 3  2 Pb(NO 3 ) 2 + PbO 2 + 2 H 2 O