 |
| IMPORTANT CHEMISTRY MCQ |
is quite high but successful number of candidate is countable with smiling face . Nobody is born intelligent but few exceptions are also there. To get success in the entrance exam you need to practice
day to day basis with mixture of MCQ questions , to check your preparation labels . That is the reason in the MCQ question section I use to mix various types of questions . So you can test your label of
understanding and your weakness about particular topics related with these MCQs.
1. Which of the following has anti - haemmoragic property
a) Vitamin D b) Vitamin B2 c) Vitamin B6 d) Vitamin K
2. AgCl ppt , dissolves in NH3 due to formation of
a) [ Ag(NH3 )2] OH b) [ Ag(NH4)2 ]OH c) [ Ag(NH3 )2]Cl d) [Ag(CH4)2]Cl
3. When mercuric iodide is added to the aqueous solution of potassium iodide , the :
a) the freezing point is raised b) freezing point is lowered c) freezing point does not change
d) boiling point does not change
4. Which of the following solution will have pH close to 1.0 ?
a) 100 ml of M /10 HCl + 100 ml of M /10 NaOH
b) 55 ml of M/10 HCl + 45 ml of M /10 NaOH
c) 10 ml of M/10 HCl + 90 ml of M/10 NaOH
d) 75 ml of M/5 HCl + 25 ml of M/5 NaOH
5. A solution has H+ ion concentration 0.0005 M . Its pOH is :
a) 8.279 b) 12.285 c) 10.699 d) 13.335
6. The amount of heat released when 20 ml of 0.5 M NaOH is mixed 100 ml of 0.1 M HCl is x kJ . The
heat of neutralisation ( in kJ / mol ) is :
a) - 100 x b) - 50 x c) + 100 x d) + 50 x
7. Which of the following electrolyte has least molar conductivity ?
a) BeCl2 b) BCl3 c) LiCl d) NaCl
8. Benzene on ozonolysis yields
a) glyoxal b) acetone c) ethanal d) methanol
9. How many structural isomers could be obtained from alkane C6H14 ?
a) Four b) Five c) Six d) Seven
10. Propyne on hydrolysis in presence of H2SO4 and HgSO4 gives
a) acetaldehyde b) acetone c) formaldehyde d) none of these
11. What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaOH ?
a) CH3Cl b) C2H2Cl c) CCl3CHO d) CHCl3
12. The flame colours of metal ions are due to :
a) Frenkel effect b) Schottky effect c) metal deficiency effect d) metal excess defect
13. The reaction of an organic compound with ammonia followed by nitration of the product gives a
powerful explosive called RDX . The organic compound is :
a) phenol b) toluene c) glycerine d) formaldehyde
14. Cumene process is the most important commercial method for the manufacture of phenol Cumene is:
a) iso-propyl benzene b) ethyl benzene c) vinyl benzene d) propyl benzene
15. Prolonged exposure of fat or oil in moist air and light causes bad smell(rancidity ) . It is due to :
a) formation of C6 - C12 fatty acids b) formation of ketone and aldehyde
c) both of these causes d) formation of glycerol
16. Acid hydrolysis of sucrose is a :
a) pseudo first order reaction b) zero order reaction c) second order reaction d) unimolecular
reactionis
17. Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid . The product
so obtained is diazotised and then heated with cuprous bromide . The reaction mixture so formed
contains :
a) mixture of O - and m- bromotoluenes b) mixture of O- and p- bromotoluenes
c) mixture of O- and p- dibromobenzenes d) mixture of O- and p- bromo anilines
18. Which of these compounds is synthesised by chloral ?
a) DDT b) BHC c) Chloroform d) Michlers ketone\
19. When phenol reacts with phthalic anhydride in presence of H2SO4 and heated and hot reaction
mixture is poured in NaOH solution , then product formed is :
a) alizarin b) methyl orange c) fluorescein d) phenolphthalein
20. The function of AlCl3 in Friedel - Craft's reaction is to :
a) absorb HCl b) absorb water c) produce nucleophile d) produce electrophile
a) 1 -Chloropentane b) 2 - Chloropentane c) 1 - Chloro-2-methyl pentane
d) 3 - Chloro - 2 - methyl pentane
22. Green chemistry means such reactions which :
a) are related to the depletion of ozone layer b) study the reactions in plants
c) produce colour during reactions d) reduce the use and production of hazardous chemicals
23. What is the value of i for H3PO4 in an ideal condition ?
a) 4 b) 3 c) 5 d) 6
24. Solubility of CO2 in cold H2O can be increased by :
a) increase in temperature b) increase in pressure c) increase in volume d) decrease in pressure
25. Which of the following is optically active ?
a) 2 - methylpentane b) Etanolamine c) Citric acid d) Glycerol
26. Alkyl halide cannot be obtained from alkane or alkene by reaction with :
a) HBR b) PCl5 c) Cl2 d) HCl
27. Δ S is negative in case of :
a) streching of rubber b) limestone c) evaporation d) boiling of egg
28. Palmitic acid is :
a) C15H31COOH b) C18H37COOH c) C25H51COOH d) C23H47COOH
29. Write the IUPAC name of epichlorohydrin :
a) 2 - chloroethanol b) 2 -hydroxyethyl chloride c) ethylene hydroxy chloride
d) 3 - chloropropan - 1 , 2 - epoxide
30. Mustard gas is :
a) dichloro diethyl sulphide b) dichloro dimethyl sulphide c) dichloro dimethyl ether
d) none of these
31. White vitriol is :
a) FESO4.7H2O b) CuSO4. 5H2O c) NiSO4 . 6H2O d) ZnSO4 . 7H2O
32. What is used to heal wound ?
a) FeCl3 b) NaCl c) PbSO4 d) FeSO4
33. Maximum ionisation energy is associated with :
a) K b) Na c) Rb d) Mg
34. What is the concentration of CO2 in atmosphere :
a) 0.003 % b) 0.034 % c) 3.4 % d) none of these
35. Maximum number of unpaired electron are present in ground state of :
a) Mn b) Zn c) Cu d) Cr
36. 1 mol each of the following compounds is dissolved in 1 L of solution. which will have the largest
ΔTh value ?
a) HF b) HCl c) HBr d) HI
37. Copper atoms are lying on 8 corners and silver atoms on 6 faces while Au at the body centre . Find
the formula :
a) CuAg3Au b) Cu3Au3Ag c) CuAgAu d) Cu2AuAg
38. Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of
metals :
a) FeO , SnO b) SnO , ZnO c) BaO , Na2O2 d) FeO , ZnO
39. Which of the following metal ions will form complexes with the same magnetic moment and geometry
irrespective of the nature of ligands ?
a) Ni 2+ b) Fe 2+ c) Cu 2+ d) Co 2+
40. Which of the following radioisotopes is used as anticancerous ?
a) Na - 24 b) c - 14 c) U - 235 d) Co - 60
a) CH3CH2CH2OH b) CH3CHOHCH3 c) CH3CHOHCH2OH d) CH3CH2CHO
42. Which of the following statement is true ?
a) Trimethyl amines form a soluble compound with Heisenberg reagent and KOH
b) Dimethylamines react with KOH and phenol to form an azo dye
c) Methylamine reacts with nitrous acid and liberates N2 from aqueous solution
d) None of these
43. The vapour pressure of pure benzene at a certain temperature is 0.850 bar . A non volatile , non -
electrolyte solid weighing 0.5g is added to 39.0 g of benzene (molar mass 78 g / ml) . The vapour
pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance ?
a) 58 b) 180 c) 170 d) 145
44. Which statement is true for ferrocene ?
a) All Fe - C are of equal length b) C are sp3 hybridized c) It was the first discovered
organometallic compound d) all of these
45. Calculate change in internal energy if ΔH = - 92.2 kJ , P = 40 atm and ΔV = - 1 L .
a) - 42 kJ b) - 88 kJ c) + 88 kJ d) + 42 kJ
BEST OF LUCK
No comments:
Post a Comment