MOST IMPORTANT CHEMISTRY MCQ FOR NEET, AIIMS & JIPMER PART -- 01

IMPORTANT CHEMISTRY MCQ

1. Which of the following has lowest ionization potential ?
     a) Sr          b) Sn         c) Sb      d) Xe

2. Which of the following is not tetrahedral ?

     a)  SiCl₄       b)  BF₄       c) NH₃     d)  SeCl₄

3.   Zwitter ion is :

       a) a molecule with positive charge having one atomless 

       b) a molecule having both positive and negative charges on opposite ends 

       c) a small molecule having only negative charge

       d) a molecule having only positive charge on one of its atom

4. The compound in brown ring test is :

      a)  [ Fe (H₂O )₅ NO ] SO₄      b) [Fe (H₂O )₄ NO ] SO₄    c) [Fe (H₂O ) NO₂ ] SO₄ d) none of these

5. When aniline is heated to 440 degree C to 460 degree C with sulphuric acid , it will give :

    a) sulphanalic acid b) aniline hydrogen sulphate c) aniline sulphite  d) benzene sulphonic acid

6. Which of the following does not show Tyndal effect ?

     a) True solution     b) suspension       c) emulsion       d) gel  

7.  n = 4 , l = 2 and m = 0 refer to :

      a)    4s        b)    4p       c)    4d      d)    4f     

8. Which of the following 0.1M aqueous solution will have lowest freezing point?

      a) Urea     b) Glucose   c) Sodium Chloride     d) potassium sulphate

9. When chloroform reacts with phenol in the presence of KOH (aq) the reaction is called :

      a) Wurtz reaction   b) Reimer-Tiemann reaction   c)Friedel-Crafts reaction     d)Perkin reaction    

10. Which of the following is an ionic hydride ?

        a) NaH       b) HCl    c)  NH₃    d) silicon hydride

11. The percentage of gold in 20 carat gold is :

       a) 95           b) 83.33            c) 80            d) 38.67 

12.  Lucas reagent will give instant turbidity with :

         a) primary alcohol    b) secondary alcohol     c) tertiary alcohol    d) methane

13. Which of the following most stable ?

         a)  C⁺H₃     b)  R₂C⁺H         c)   R₃C⁺        d)   RC⁺H₂    

14.  The bond order in C ₂⁺ is :

       a) 1              b) 2                c) 0.5          d) 1.5

15. Which  of the following is non metalloid ?

       a) Si        b) Se     c) As     d) Te

16. Pressure is increased with temperature for constant volume and fixed mass of a gas due to :

      a) increase in intermolecular attraction            b) decrease in the mean free path

      c) increase in the collision between molecule  d) increase of K.E of molecule

 17. Which of the following compound is formed by Na on fusion with an organic compound having

        nitrogen as an extra element: 

         a) NaN   b) NaCN    c) NaNO     d) NaC

18. The  density of HCl is 1.21 g / ml . Its normality is :

      a)  33.15 N  b) 18.3 N  c) 198 N     d) 35 N

19. DDT is used as :

      a) insecticide    b) antibiotic  c) antiseptic  d) herbicide

20. Hybridization in phosphorous trichloride is :

      a)  sp³        b) sp²        c) sp³ d       d) sp        

21. The half life is 5 min. how much % of radioactive compound remains after 20 minutes ?

        a) 6.25 %     b) 93.75 %   c) 12.5 %      d) 87.5%

22. At S.T.P 10g of calcium carbonate on decomposition will liberates carbon di oxide :

        a)  22.4 litre       b)  10 litre        c)  2.24 litre       d)  15 litre

23. Oxidation number of aluminium in Na₃AlF₆ is :
       a)  +3      b) +2    c) - 2   d) +1

24. The E.A.N of  Ni in  Ni(CO)4 is:
        a) 36     b) 34  c) 32    d) 30

25. The product of pressure and volume (pv ) has a unit of :
       a) force   b) energy    c) entropy   d) impulse

26. Amines cannot show :
       a) geometrical isomerism b) optical isomerism c) metamerism d) none of these

27.  Silicons are :
       a) halo derivatives of alkyl silanes b) tetra alkyl silanes  c) hydrolysis product of alkyl
          halosilanes    d) polymers of halosilanes
 

28. Acetic acid and formic acid do not differ in their action on :

        a) ammonical Silver nitrate         b) sodium bi carbonate                 c) neutral ferric chloride                             d) conc. sulphuric acid

29. Which of the following is not a colloid  ?

         a) milk   b) blood  c) muddy water   d) none of these

30. Which of the following does not have  covalent bond ?

         a) NaOH        b) NH4Cl        c) CsCl       d) H2O

31. By passage of IF of electricity , which is not obtained ?

        a) 1 mol of Cu      b) 0.5 mol of Mg     c) 9g of Al    d) 5.6 L of O2 gas at anode

32. Which of the folowing is not a state function ?

         a) Entopy   b) Internal energy  c) Heat  d) Free energy  

33. The molecular mass of NaCl as determined by osmotic pressure measurement is :

         a) 58.5   b) less than 58.5   c) more than 58.5  d) unpredictable 

34. Which is not a pi bonded complex ?

        a) Zeisse's salt b) Ferrocene  c) Dibenzene chromium  d) tetraethyl lead

35. When yellow solution of FeCl3 is treated with SnCl2 the colour changes to :

       a) green     b) black     c) grey      d) no colour change   

36. Ethanamide on treatment with Br2 / NaOH gives :

        a) ethanamine  b) ethyl alcohol  c) methanamine  d) bromoform

37. Which of the following is not a polymer :

       a) DNA   b)Teflon  C) Freon  d) Gutta Purcha

38. Which is not an ore of magnesium ?

        a) Dolamite    b) Carnalite    c) Felspar       d) Sorel's cement  

39. Which of the following is a three dimensional silicate ?
        a) Mica     b) Spodumene   c) Zeolite      d) None of these

40. MgCl2. 6H2O when heated gives :
        a) Magnesium oxide  b) magnesium oxychloride   c) magnesium dichloride 
        d) magnesium chloride

41. The shape of IF7 molecule is :
        a) pentagonal bipyramidal   b) trigonal bipyramidal    c) tetrahedral  d) octahedral 

42. Oxidation state of iron in  Fe₃O₄ is :
       a) 8 /3       b) 3 / 4          c) 3 / 2      d) 1 / 2

43. Reduction of nitrobenzene in the presence of Zn and KOH gives :
        a) hydrazobenzene     b) nitrobenzene     c) azobenzene     d) azoxybenzene 

44. The inert gas abundantly found in atmosphere is 
       a) Ac     b) Kr     c) He      d) Ar

45. In which of the following the bond length between hybridized carbon atom and other carbon atom is minimum ?
        a) Propyne      b) Propene     c) Butane    d) Propane



     
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                          ANSWER ON THE 5 TH FEBRUARY 2017