Saturday, November 12, 2011

X CBSE | NCERT Carbon and Its Compounds - Test Paper

1. If the pH of water is two, out of soap and detergent which one will you usefor cleaning clothes? (1)

1. Name the compound CH3COOC2H5.Name the acid and alcohol from which it is made .write equation.

2. An organic compound X with a molecular formula C2H6O undergoes oxidation with in presence of Alkaline  KMnO4 to form a compound Y. X on heating in presence of conc. H2SO4 at 443k gives Z which on reaction with H2O in presence of H2SO4 gives back ‘X’ ‘Z’ reacts with Br2 (aq) and decolorizes it.
Identify X, Y &Z and write the reactions involved. (3)

3. An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H2O2 .This compound reacts with ethanol to form a sweet smelling compound B.
(i) Identify the compound A.
(ii) Write the chemical equation for its reaction with ethanol to formcompound ‘B’
(iii) How can we get compound ‘A’ back from B?
(iv)Name the process and write corresponding chemical equation (3)

4. Hydrocarbons X and Y have melting points-1900 C & -900 C respectively.Which one of these has minimum carbon in the molecule &why? (2)

5. Three bottles without labels contain alcohol, ethanoic acid and soap solution separately how will you test which bottle contains what. (3)

6. A compound X has molecular formula C4H10.It undergoes substitution reaction more readily than addition reaction. It burns with blue flame and is present in LPG. Identify ‘X’ and give the balanced equation for its combustion and substitution reaction with Cl2 in the presence of sunlight. (3)

7. A compound ‘A’ works well with hard water. It is used for making shampoos and products for cleaning clothes. A is not 100%biodegradable and causes water pollution. ‘B’ does not work well with hard water. It is 100%biodegradable and does not create water pollution. Identify A&B. (1)

8. Can we use sodium metal for drying alcohol, why? (2)

9. Complete and balance following equation:-
a) CH2=CH2 + H2  --Heat---------->
b) CH4+O2   --------------------à

10. Two alkanes A and B have 4 and 6 carbon atoms respectively in their molecule. In which physical state will they occur at room temp?
i) Give a test that can be used to differentiate chemically between butter and cooking oil.
ii) How will you distinguish between ethanol and ethanoic acid by a suitable chemical test? Write chemical reactions involved.
ii) Complete the following reactions :-
a) CH3COOH + NaHCO3 --coc. H2SO4-------->
b) HCOOH + CH3OH-------------->
c) CH3COOC2H5 + H2O----------->

MCQ MULTIPLE TYPE QUESTIONS

Q1. Which of the following is not a saturated hydrocarbon?
i) cyclohexane.         
 ii)benzene.               
 iii)butane                
 iv)isobutene

Q2.The bond between two identical non matalic atom has a pair of electron?
 i) un equally shared between two atoms.     
 ii) transferd completely from one atom to another. 
iii) with identical spins                     
iv) equally shared between them.

Q 3. Covalent compounds are genarily
i) solubal in water    
ii)insolubal in water      
 iii)ionize in water   
iv)hydrolyse in water

Q 4. Propane with the molecular formula C3H8 has
i)7covalent bonds               
ii)8 covalent bonds               
 iii)9 covalent bonds           
 iv)alcohol

Q5. A hydrocarbon reacts with ammonical cuprons chloride Solution to form a red pricipate .The hydrocarbon is
 i)ethane                
ii)ethane                 
 iii)2-pentyne              
 iv)1-propyne

Q6.Which of the following substance is added to denature Ethanol?
i)methanol               
ii) pyricline      
iii)copper sulphate           
 iv)all of them

Q7. Which of the following is not an allotropic form of carbon
i)fluronie               
ii)fullerence                
iii)diamond            
 iv)graphite

Q8.Detergents are sodium or potassium salts of long chain of ;-
i)aldehydes         
 ii)ketones                 
 iii)carboxylic acid     
iv)sulphonic acid

Q9.Which of the following represents the correct increasing order Of unsaturated carbon ?
 i)alkanes , alkenes , alkynes                               
 ii)alkanes , alkaynes , alkenes
 iii)alkenes , alkynes , alkanes                        
 iv)alkynes , alkanes , alkenes
Q10. In double covalent bond there is sharing of
 i)2 electrons       
 ii)4 electrons                  
 iii) 6electrons                  
 iv)3 electrons

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