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Entrance Guru: Chemistry Model questions and answers part 3

Posted by: VinAy KrishNan Posted date: 8:53 PM / comment : 0 ,


1) The chemical name of phosgene is :
 a) Phosphorus 
 b) Carbonyl chloride
 c) Phosphorus oxychloride
 d) Phosphorus trichloride

2) Basicity of orthophosphoric acid is
 a) 2
 b) 3
 c) 4
 d) 5

3) Cane sugar reacts with conc. HNO3 to give 

 a) CO2 & H2O
 b) Oxalic acid 
 c) Co & H2O
 d) Carbonic acid

4) Which of the following halides is the most acidic?
 a) PCl3
 b) SbCl3
 c) BiCl3
 d) CCl4

5) In which of the following NH3 is not used?
 a) Cold storage
 b) Anaesthetic 
 c) Manufacture of rayon and plastic 
 d) none of these 
    
                                                        Answers


1) b) Carbonyl chloride is known as phosgene 

2) b) orthophosphoric acid, contains three P-oh groups and is therefore ,tribasic

3) b) Sugarcane  on reaction with conc.HNO3 gives oxalic acid 

4) a) PCl3

5) b) NH3 not used as anaesthetic 


Entrance Guru:Chemistry Model questions and answers part 2

Posted by: VinAy KrishNan Posted date: 8:19 PM / comment : 0 ,

                                                              Chemistry
1) When a colloidal solution is observed under an ultra microscope,we can see :
   a) light scattered by colloidal particles 
   b) size of colloidal particles
   c) shape of the colloidal particles
   d) relative size of colloidal particles

2) Gold number is minimum in case of :
   a) Gelatin
   b) Egg albumin
   c) Gum arabic
   d) Starch

3) which of the following catalysts is used for preparing toluene by reacting benzene with methyl chloride?
   a) Ni
   b) Anhydrous AlCl 3 
   c) Pd
   d) Pt

4) In the hydrogenation of oil the catalyst used is 
   a) Iron
   b) Platinum 
   c) Nickel
   d) Molybdenum

5) Mist is an example of colloidal system of :
   a) Liquid dispersed in gas 
   b) Gas dispersed in gas
   c) Solid dispersed in gas 
   d) Solid dispersed in liquid 
                                                      Answers  
1) a) When a colloidal solution is observed under an ultra microscope ,we can see light      scattered by colloidal particles

2) a) Gold number is minimum in the case of gelatin


3) b) benzene is treated with CH3Cl in the presence of catalyst AlCl3 gives toluene

4) c) In hydrogenation of oils,Ni is used as a catalyst

5) a) Mist is a colloidal system of liquid dispersed in gas

Entrance Guru:Chemistry Model questions and answers part 1

Posted by: VinAy KrishNan Posted date: 8:32 PM / comment : 0 , ,

Chemistry

1) In a multi -electron atom, which of the following orbitals described by the three quantum    numbers will have the same energy in the absence of magnetic and electric fields?

  i) n=1, l=0,m=0
  ii) n=2,l=0,m=0
  iii) n=2,l=1,m=1
  iv) n=3,l=2,m=1
  v) n=3,l=2,m=0

  a) (i)&(ii)
  b) (ii)&(iii)
  c) (iii)&(iv)
  d) (iv)&(v)

2) Which one of the following has the regular tetrahedral structure?
      (Atomic number B=5, S=16, Ni=28 ,Xe=54)

 a) XeF4
 b) SF4
 c) BF4-
 d) [Ni(CN)4]2-

3) The function of enzymes in the living system is to

 a) catalysis biochemical reactions
 b) provide energy
 c) transport oxygen
 d) provide immunity

4) Which of the following molecules/ions does not
 a) O22-
 b) B2
 c) N2+ 
 d) O2

5) Aspirin is an acetylation product of 

 a) m-Hydroxybenzoic acid
 b) o-Dihydroxybenzene 
 c) o-Hydroxybenzoic acid
 d) p-Dihydroxybenzene 

Answers

1) d) (iv)&(v)  Orbitals having same (n + 1) value in the absence of electric and magnetic field will have same energy.

2) c)BF4- is regular tetrahedral

3) a) catalysis biochemical reactions The enzymes are globular proteins which catalyse chemical reactions in the living systems.

4) a) O22-

5) c) o-Hydroxybenzoic acid  Aspirin is acetyl salicylic acid,which is formed by acetylation of                                   o- Hydroxybenzoic acid


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