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10th Carbon and Its Compounds Solved Paper-1

28/8/2011

1 Comment

 
Q. 1. How much percentage of earth’s crust constitutes carbon element ?

Ans. The earth’s crust has only 0·02% of carbon in the form of minerals. 

Q. 2. What do you mean by covalency ? 

Ans. Covalency is defined as the number of electrons shared by an atom. 

Q. 3. What is covalent bond ? 

Ans. A bond formed by the sharing of electrons is called covalent bond. 

Q. 4. What is functional group ? 

Ans. A functional group is an atom or a group of atoms that characterizes the chemical properties of an organic compound. 


Q. 5. What is organic chemistry ? 

Ans. The branch of chemistry that deals with study of compounds of carbon except for oxides of carbon, carbonate and hydrogen carbonate salts is called organic chemistry. 

Q. 6. What are Hydrocarbons ? 

Ans. These are the compunds of carbon and hydrogen are called hydrocarbon. 

Q. 7. What are saturated carbon compounds ? 

Ans. The compunds of carbon in which carbon-carbon atoms are linked by single covalent bond are called saturated carbon atoms; Alkanes. 

Q. 8. What are unsaturated carbon compunds ? 

Ans. The compounds of carbon in which carbon-carbon atoms are linked by multiple bonds i.e. double or triple bonds are called unsaturatedcarbon compounds, e.g : Alkenes or Alkynes. 

Q. 9. Define Allotropy. 

Ans. The phenomena by virtue of which an element can exist in two or more than two forms having similar chemical properties but different physical properties is called allotropy. 


Q. 10. What is vinegar ? 

Ans. Vivegar is 5–8% solution of acetic acid in water.


SHORT ANSWERS TYPE QUESTIONS   2 Marks each 

1.What is combustion ? 
Ans. It is the process of burning of a substance in the presence of oxygen to produce carbon dioxide along with heat and light.Combustion reactions are also called oxidation reactions.
e.g. : CH4 + O2 ——> CO2 + H2O + Heat and light 

2. Write two differences between oils and fats. 
Ans. 
Oils : 1. Oils are liquid at room temperature 2. Oils contaning unsaturated fatty acids.
Fats : 1. Fats are solid at room temperature.    2. Fats containing saturated fatty acids. 

3. Define Esterification ? 
Ans. It is the process of formation of ester by the reaction between an alcohol and an acid is called esterification. e.g. : Reaction between ethanol and ethanoic acid in presence of conc. H2SO4. 
CH3COOH        +        C2H5OH ——> CH3COOC2H5 + H2O
Ethanoic acid               Ethanol                Ethylethanoate      Water 

4. What is saponification ? 

Ans. It is the alkaline hydrolysis of esters to give back the carboxylic acid and alcohol. As it is used in the prepation of soap, it is called saponification. 
CH3COOH     +      NaOH             ——> CH3COONa           +       C2H5OH
Ethanoic acid     Sodiumhydroxide             Sodiumethanoate                Ethanol 

5. Which of the following hydrocarbons undergo addition reactions :
C2H6, C3H8, C3H6, C2H2and CH4. 

Ans. Unsaturated hydrocarbons, i.e., Alkenes and alkynes undergo addition reactions. Alkenes and alkynes have general formula CnH2n and CnH2n -2. 
Thus compounds — C3H6 (propene) and, C2H2 (ethyne) ; undergo addition rections. 

6. How can you differentiate saturated and unsaturated Hydrocarbon on the basis of burning behaviour ? 


Ans. On burning, saturated hydrocarbons give a clean flame whereas unsaturated Hydrocarbons on heating give a yellow flame with lots of black smoke. 

7. Write two ill-effects of drinking excess of alcohol ? 


Ans. (1) Alcohol causes addiction and makes person dependent on it.
(2) If consumed in large quantities, it may cause death by damaging liver. 

8. What is denatured alcohol ? 


Ans. Alcohol which is made unfit for the drinking purposes is called denatured alcohol. It is ethyl alcohol (C2H5OH) mixed with poisonous substances like methanol, copper sulphate, etc. 

9. Give two advantages of synthetic detergents over soaps ? 


Ans. (1) Synthetic detergents can be used with hard water also whereas soaps cannot with hard water.
(2) Synthetic detergents are more soluble and have better cleansing action than soaps.

10. What are substitution reactions ? 


Ans. It is a type of reaction in which a chemical reagent (substituent) displaces the another atom or group (leaving group) in a compound, e.g., Substitution of Hydrogen of Methane by chlorine 
CH4           + Cl2         --Sunlight ---------->       CH3Cl              +              HCl 
Methane    Chlorine                                       Methyl Chloride           Hydrogen Chloride 
                                                                                           or 
                                                                                 Chloramethane

SHORT ANSWERS TYPE QUESTIONS 3 Marks each

1. Differentiate between diamond and graphite. 

Ans. Diamond :

1. Diamond has 3-dimensional network structure.
2. Each carbon in diamond is bonded to four other carbon atoms.
3. No free electron is left.
4. It is a bad conductor of electricity.
5. It is hard.

Graphite :

1. Graphite has hexagonal sheet layer structure.
2. Each carbon atom in graphite is bonded to three other carbon carbon atoms.
3. Each carbon has one free electron with it.
4. It is a good conductor of electricity.
5. It is soft and slippery.

2. How is combustion different from pyrolysis ? 

Ans. Combustion means heating a compound in the presence of excess or limited supply of air, e.g., combustion of methane gives carbon dioxide and water. 
CH4 + O2 ——> CO2 + H2O + Heat and light. 
Pyrolysis means the decomposition of a hydrocarbon into its element on strong heating in the absence of air, e.g. : Pyrolysis of methane gives carbon and hydrogen.
CH4               ------100°C-------------> C + 2H2 
                            In abesebce of air

3.Discuss the method of preparation of soap in the laboratory. 

Ans. In laboratory, soap is prepared by heating of equal volumes of castor oil and concentrated sodium hydroxide solution taken in a beaker. A paste of soap is formed by constant stirring during heating. Most of the soap separates out but some of it remains dissolved in solution. NaCl is then added to precipated out all the soap from equeoussolution. On cooling the solution, solid soap separates out.
Glycerl Oleate + Sodium ---Heat -> Sodium Oleate + Glycerol 
 Glycerol is obtained as a byproduct in this process. 

4. Write five ill effects of alcohol drinking. 

Ans. (1) Alcohol is an intoxicant and its drinking result lose in the sense of discrimination.
(2) It ruins the health of the person by damaging liver and making his brain dull.
(3) Alcohol drinking by the head of a family worsens the economic condition of the family.
(4) The alcohol drinking by the head of a family has very bad effect on the psychological development of the children.
(5) Drinking adulterated alcohol causes blindness or even death. 

5. Differentiate between soaps and synthetic Detergents. 

Ans. Differences between soaps and synthetic detergents :

Soaps :

1. They are the sodium salts of the long chain carboxylic acids. The ionic group in soaps is – COO Na
2. Soaps have relatively weak cleansing action.
3. Soaps are prepared from animal fats or vegtable oils.
4. They are not suitable for washing clothes in Hard water.
5. Soaps are biodegradable.

Synthetic Detergents :

1. Synthetic detergents are the sodium salts of long chain benzene sulphone acids or long chair alkyl hydrogen sulphate. The ionic group in a synthetic detergent is — SO3Na or —SO4—Na+.
2. Synthetic detergents have a strong cleasing action.
3. Synthetic detergents are prepared from the hydrocarbons.
4. Synthetic detergents can be used for washing clothes even in Hard Water.
5. Synthetic detergents are non-biodegradable. 

6. Differentiate between ionic compounds and covalent compounds. 

Ans. Difference between ionic compounds and covalent compounds :

Ionic compounds :

1. Ionic compounds have constituents particles called ions.
2. In these compounds the ions of opposite charge are held together by strong electrostatic forces of attraction.
3. They have high melting and boiling points.
4. These conduct electricity in solution or in molten state.

Covalent compounds :

1. Covalent compounds have constituent particles called molecules. 
2. In these compounds the molecules are held together by weak attractive forces.
3. They have low melting and boiling points.
4. These are largely non-conductor. 

7. Give some important properties of ethanol (ethyl alcohol). 

Ans. (1) Ethanol (C2H5OH) is highly soluble in water.
(2) It is a colourless liquid at room temperature.
(3) It has very low melting point (156 K).
(4) It has low boiling point (351 K or 78ºC).
(5) It is one of the main components of alcoholic drinks.
(6) It is a good organic solvent.
(7) Ethanol alcohol reacts with Na metal vigorously to evolve H2 gas. 
2C2H5OH + 2Na ——> 2C2H5ONa + H2 (g) 
Sodium ethoxide
(8) It burns with blue flame in the presence of O2 of air. This combustion is an oxidation process. 
C2H5OH + 3O2  -Combustion ----->2CO2 + 3H2O + Heat and light 

8. Give five main advantages of synthetic detergents over soaps. 

Ans. Following are the advantages of synthetic detergents :
a. Synthetic detergents can be used even with hard water but soaps cannot be used with hard water.
b. Synthetic detergents have a stronger cleansing action than soaps.
c. Synthetic detegents are more soluble in water than soaps.
d. Synthetic detergents are prepeard from the hydrocarbons white soaps are prepared from from animal fat or vegetable oil which leads to their deficiency for human consumption.
e. Synthetic detergents can be used even in acidic solution but not the soaps. 

9. Write important uses of (a) ethanol and (b) ethanoic acid. 

Ans. (a) Uses of ethanol :

(1) Ethanol (ethyl alcohol) is used for making alcoholic drinks like wines, whiskies, beer, etc.
(2) It is used for making wood polish.
(3) It is used for making some medicines like cough syrups, tincture iodine and some tonics.
(4) It is used for making antifreeze material for cooling engines of vehicles.

(b) Uses of ethanoic acid :

(1) Dil. solution of ethanoic acid (acidic acid) in water is called vinegar, which is used as a preservative of pickles.
(2) It is used as a useful reagent in the chemical laboratories.
(3) It is used for making many C– compounds.
(4) It is used for making esters which are used as flavouring agents and perfumes.

10. What happens when ethanol reacts with   (i) sodium     (ii) potassium permanganate solution. 

Ans-(i) with sodium metal ,sodium ethoxide formed. 

2CH3CH2OH+2Na ------------> 2CH3CH2ONa + H2 

(ii) With alkaline potassium permanganate, ethanol is oxidised to ethanoic acid. 

CH3CH2OH+2[O] --------> KMnO4 ---Dil.H2SO4 -----> CH3COOH + H2O

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Sample Question Paper Class 10 Mathematics SA-1 -2011-2012

26/8/2011

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      • 10th Area Related to Circles
      • 10th Surface Areas and Volumes
      • 10th Probability
      • 10th Constructions
    • 10th Social Science
      • 10th History and Geography
      • 10th Civics and Economics
    • 10th CBSE English
    • 10th Solved Assignments
  • CLASS 9
    • 9th Science term I
      • IX Motion and Rest
      • IX Force and Laws of motions
      • IX Gravitation
      • IX Matter in our surrounding
      • IX Is Matter around Us Pure
      • IX Biology Term-1
        • Cell structure n function class9
        • Tissue class9
        • Improvement in food resources class9
    • 9th Science term II
      • Atoms and Molecules
      • Structure of the Atom
      • Thrust and Pressure
      • Work and Energy
      • Sound
      • IX Biology Term-2
        • Diversity in Living Organisms
        • Natural Resources
        • Why Do We Fall ill ?
    • 9th Maths term I
      • IX Number system
      • IX Polynomials
      • IX Introduction to Euclid Geometry
      • IX Lines and Angles
      • IX Triangles
      • IX Coordinate geometry
      • IX Area of triangles by Heron's formula
    • 9th Maths term II
      • Linear equations in two variables
      • Quadrilaterals
      • Area of Parallelogram and Triangle
      • Circle
      • Surface Areas and Volumes
      • Constructions
      • Statistics
      • Probability
    • IX Social Science
      • 9th Social Science Term-1
      • 9th Social Science Term-2
    • IX English and Hindi
    • CBSE ASL Corner
  • IX Sample Papers
    • 9th Mid Term Papers
    • 9th Final Exam papers
    • 9th Sample Paper 2018
    • IX Sample Papers SA-I
      • 9 Mathematics SA1
      • 9 Science SA1
      • 9 Social Science SA1
      • 9 English and Hindi SA1
    • IX Sample Paper SA-II
      • Mathematics
      • Science
      • Social Science
      • English Hindi Sanskrit
    • IX Practical skill Science
  • X Sample Papers
    • 10th Board Exam Papers
      • 10th Mid Term Papers
      • 10th Sample Paper 2018-19
    • X Sample Paper SA-I
      • X Mathematics SA1
      • X Science SA1
      • X Social Science SA1
      • 10th English sa-1 paper
      • 10th Hindiand sanskrit sa-1 paper
    • X Sample Paper SA-II
      • Mathematics
      • Science
      • Science Practicals MCQ
      • Social Science
      • Hindi English and Sanskrit
  • CLASS 8
    • 8th Science
      • Class 8 Physics
        • Force Pressure and Frictions
        • Sound
        • Chemical Effects of Electric Current
        • Refraction of Light and Our Eyes
        • Some Natural Phenomenon
        • Stars and the Solar System
      • Class 8 Chemistry
        • Synthetic fibre and Plastics
        • Metals and Non-Metals
        • Combustion ,Flame and Fuel
        • Coal Petroleum, Natural Gases
        • Air and Water Pollution
      • Class 8 Biology
        • Crop Production and Management
        • Microorganisms friend and foe
        • Cell structure and functions
        • Reproduction in animals
        • Reaching the Age of Adolescence
        • Conservation of plants and animals
    • Class 8 Mathematics
      • Algebra
        • Rational Number
        • Square and Square Roots
        • Algebraic Expression
        • Factorization
        • Exponent and Power
        • Linear Equations
      • Commercial math
        • Unitary Methods
        • Percentage
        • Profit and Loss
        • Discounts & Sales Tax
        • Compound Interest
      • Geometry/Mensuration
        • Quadrilateral
        • Practical Geometry
        • Perimeter and Area
        • Data Handling
        • Introduction of Graphs
    • Class 8 Sample papers
      • 8th Question paper sa1
      • 8th Question paper sa2
  • CLASS 07
    • class 7 Science
      • class 7 Physics
      • class 7 chemistry
      • class 7 Biology
      • 7th Science Test Papers
      • 7th Science Solved Papers
    • class 7th Maths
      • Class 07 Maths Tem-I
      • Class 07 Maths Tem-II
    • Class7 Exam Papers
  • Class 06
    • 6th Maths
    • 6th science
      • 6th Science Term-1
      • 6th Science Term-2
  • NCERT Solutions
    • X Science and Maths
    • IX Science and Maths
  • Class 11 - 12
    • 12th Sample paper
    • 11th Study Material
      • 11th Physics
      • 11th Chemistry
      • 11th Maths
    • 12th Study Material
  • NTSE
    • NTSE SAMPLE PAPER