Marks: 26.                            Time: 47 mins
Instructions:
These  Test series contains 15 questions, among which 8 are MCQ, 3 are msq, and 4 are NAT.
Section -A: MCQ(Multiple choice questions)
Q.1-Q.4 carry one mark
Q .5-Q.8- carry 2 marks
Section -B: MSQ(Multiple select questions)
Q.9-Q.11 carry 2 marks
Section -C: NAT( Numerical answer question)
Q.12-Q.15 carry 2 marks.

The objective of this test series : 

You can learn the following concept Borazine formation reaction, acid-base equilibrium depending on factor organic reaction mechanism like substitution, aromatic character of organic compounds, the structure of oxides of nitrogen, spin only magnetic moment of coordination compound and their comparison, etc. 

                Section -A

Multiple-choice questions

Q.1:

Using chlorobenzene as a solvent, the reagents needed for efficient synthesis of borazine are

1. NH4Cl and BCl3
2. NH4Cl, BCl3, and NaBH4
3. NH4Cl and NaBH4
4. NH3 and BCl3

Q.2:

If it is known that H2S is a weak acid and that ionizes to form 2H^- and S^2-, lowering  the pH of the solution by the addition of HCl should
1. Lower the concentration of S^2-
2. not affect S^2- ion concentration
3. Raise the concentration of S^2-
4. Not possible to state.

Q.3:

Consider the elevation of boiling point produced by 0.1 M solutions of the following
A. Sucrose , B. KBr , C. K3[ Fe( CN)6]  ,
D . K2CO3
1. A > B > C >D
2. A > D > C> B
3. C> D > B > A
4. D > C > A > B

Q. 4:

The reaction of 1- Bromo-3-chlorocyclobutane with metallic sodium in dioxane under reflux conditions gives

A) 1
B) 2
C) 3
D) 4

Q. 5 :

Which one of the following is the most stable carbocation?
A) CCl3^-
B) Ph2CH^-
C) Me2CH^-
D) Me3C^-

Q. 6:

Which of the following penta -chlorides does not exist?
A) PCl5
B) SbCl5
C) AsCl5
D) BiCl5

Q.7:

The shape of BrF3 is
A) Trigonal pyramidal
B) Trigonal planar
C) Trigonal bipyramidal
D) T-Shaped.
Q.8:

The compound formed on methanolysis of P is
A) 1
B) 2
C) 3
D) 4
      

Q.9:

The nitrogen oxide(s) that contain(s) N-N bond(s) is (are)
A) N2O
B) N2O5
C) N2O4
D) N2O5

Q. 10:

Which of the following compounds will not undergo substitution reaction?

A ) 1
B ) 2
C ) 3
D ) 4
Q.11:

Which of the following ions will have same magnetic moment ?
A) Mn2^+
B) Fe^2+
C) Ti ^2+
D) Cr^2+
  

Q.12:

The spin only magnetic moment value of Cr(CO)6 is _________.

Q.13:

1.0 gm of magnesium is burnt with 0.56gm of O2 in a closed vessel. Which reactant will left in excess and how much __________ ? ( At .wt. Mg = 24 ; O =16)

Q.14:

How many species show aromatic character___________ ?
  
Answer :

   Section - A:

Q.1) 2 , Q.2) 1 , Q. 3) 2  , Q. 4) D , Q. 5) A
, Q.6 ) D , Q.7 ) D , Q. 8) D

Section - B:

Q. 9: A, B, C; Q. 10: B, D; Q. 11: B, D

Section - C:

Q. 12: 0 ;  Q.13: 0.16 gm ; Q. 13:  3

Explanation of all questions will publish very soon. Thank you.

M.sc in Chemistry in NIT Rourkela