Fluorobenzene (C₆H₅F) can be synthesized in the laboratory  

1)  by direct fluorination of benzene with F2  gas  
2)  by reacting bromobenzene with NaF solution  
3)  by heating phenol with HF and KF
4)  from aniline by diazotisation followed by heating the diazonium salt with HBF₄
   

Glycerol is purified by

1) Steam distillation

2) Sublimation

3) Simple distillation

4) Vacuum distillation

When 2 g of a gas A is introduced into an evacuated flask kept at 25°C, the pressure is found to be 1 atm. If 3g of another gas B is then added to the same flask, the pressure becomes 1.5 atm. Assuming ideal gas behavior, find the ratio of molecular masses MA : MB.

Select one:

1) 1?2
2) 3?1 
3) 2?1
4) 1?3

Which of the following compounds can exhibit linkage isomerism?

1) [Co(en)₃]Cl₃
2) [CoCl₂(en)₂]Cl
3) [CoCl(NO₂)(en)₂]Br
4) [CoCl(NH₃)₅]Br₂

For a chemical reaction A ® products, the rate of reaction doubles when the concentration of A is increased by 4 times. The order of reaction is

1)  0

2)  1/2

3)  1

4)  4

For the reaction between KMnO₄? and H₂O₂?, the number of electrons transferred per mole of H₂?O₂? is:

1) 1

2) 2

3) 3 

4) 4

0.3g of an oxalate salts was dissolved in 100mLsolution. The solution required 90mL of N/20KMnO₄ for complete oxidation. The %of oxalate ion in salt is::

1) 3.3%

2) 66%

3) 70%

4) 40%

The ionization constant of phenol is more than that of ethanol because:

1) phenoxide ion is a stronger base than ethoxide ion
2) phenoxide ion is stabilized by resonance
3) ethoxide ion is stabilized by resonance
4) phenoxide ion is aromatic while ethoxide ion is aliphatic

The highest magnetic moment is shown by the transition metal with the configuration:

1) 3d²
2) 3d⁶
3) 3d⁷
4) 3d⁹

The ionization energy of the electron in the lowest orbit of hydrogen atom is 13.6 eV. The energies required in eV to remove electron from three lowest orbits of hydrogen atom are

1) 13.6, 6.8, 8.4
2) 13.6, 10.2, 3.4
3) 13.6, 27.2, 40.8
4) 13.6, 3.4, 1.51