OBJECTIVE IMPORTANT QUESTION OF CHEMISTRY

ENGEENERING ENTRANCE AND MEDICAL ENTRANE EXAM-2013/2014

                                     SUBJECT--CHEMISTRY  

Q1-Which of the following will not give co₂ gas with NaHSO_3.? 

A)     Phenol                                        B) Succinic acid

C) Benzoic acid                          D) Acetic acid

Q2- Bezaldehyde reacts with acetic anhydride, gives-

A)    Benzoic acid                         B) Cinnamic acid

C) Succinic acid                        D) Acetophenone

Q3-Cacl₂ undergoes 20% dissociation. What is it vant Hoff factor-

  A) 1.6                                            B) 1.4

  C)  2.4                                            D) 2.8

Q4-Which of the following compound have 1.732 magnetic moment-

        A)  [Cucl₆]^4-                               B) [Crcl₆]^4-

        C) [Co (OH]^4-                                     D) [ Zncl₆]^4-

  Q5-100ml of 0.2M CH₃COOH mixed with 200 ml of o.1M CH₃COONa. If PKa is 4.74, then pH of the buffer solution is-

A)    5.78                                             B) 4.74

C) 3.43                                              D) 7.02

Q6-Which set of the quantum number, is not correct-

A)    N  =4         l=2      m=0       s=+1/2

B)    N  =2         l=0      m=0       s=-1/2

C)    N  =3         l =2     m=-1      s=-1/2

D)   N =2          l =0    m =-1      s=-1/2

Q7- The reduction of But 2-yne with H₂/Pd−BaSO₄ (lindlar catalyst) gives-

 A) Cis but 2-ene              B) Transe But 2-ene 

 C) Butane                        D) All of these

Q8- Which of the following is used as an antiknocking agent-

      A) Tri methane silane        B) Tetra ethyl lead

C) Tetra methyl zinc           D) Aluminum iso propoxide

Q9-Which of the following will give positive iodoform test?

A)  C ₆H ₅ONa              B)            CH ₃CN       

 C) CH ₃CH ₂COCH₃   D)             CH ₃COOH

Q10-. Which of the following will give cannizaro reaction-?

A) HCHO                           B) CH ₃CH ₂CHO  

 C) CH ₃COCH ₃                           D) CH ₃CHO

Q11-Which of the following is used as an antiknocking agent-

A) Tri methane silane          B) Tetra ethyl lead

C) Tetra methyl zinc           D) Aluminum iso propoxide

      B) Tetra ethyl lead

C) Tetra methyl zinc           D) Aluminum iso propoxide

Q9-Which of the following will give positive iodoform test?

A)  C ₆H ₅ONa              B)            CH ₃CN       

 C) CH ₃CH ₂COCH₃   D)             CH ₃COOH

Q10-. Which of the following will give cannizaro reaction-?

A) HCHO                           B) CH ₃CH ₂CHO  

 C) CH ₃COCH ₃                           D) CH ₃CHO

Q11-Which of the following is used as an antiknocking agent-

A) Tri methane silane          B) Tetra ethyl lead

C) Tetra methyl zinc           D) Aluminum iso propoxide

Q12-p_H value of 10^-8 M Hcl aqueous solution is

      A) 6.96                                B) 8

C) 6                                     D) 14