The shape of XeO₂F₂ molecule is :

1) tetrahedron
2) pyramid
3) see-saw 
4) square planar

When 0.5g. of sulphur is burnt to SO₂ 4.6 kj of heat is liberated. What is the enthalpy of formation of sulphur dioxide? (S=32 and O=16)

1) -147.2KJ
2) + 147.2KJ
3) + 294.4KJ
4) - 294.4KJ.

AThe artificial sweetener, which is a derivative of sucrose, is:

1) stevia

2) saccharin

3) aspartame

4) sucralose

Acetylene molecule, the two carbon atoms are linked by

1) One sigma bond and two pi-bonds
2) Two sigma bonds and one pi-bond
3) Three sigma bonds
4) Three pi-bonds

Which of the following represents soap?

1)  C₁₅H₃₁COOH

2)  (C₁₇H₃₅COO)₂Ca

3)  C₁₇H₃₅COOK

4)  C₁₇H₃₅COOH

An element having bcc geometry has atomic mass 50. Calculate the density of the unit cell, if its edge length is 290 pm

1) 68.1g/cm³
2) 5.81g/cm³
3) 6.81g/cm³
4) none

Aqueous solution of a metallic nitrate X reacts with NH₄OH to form Y which dissolves in excess NH₄OH. The resulting complex is reduced by acetaldehyde to deposit the metal. X and Y, respectively, are:

1) Cs(NO₃) and CsOH
2) Zn(NO₃)₂ and ZnO
3) AgNO₃ and Ag₂O
4) Mg(NO₃) and Mg(OH)₂

The process of separation of an organic compound  from its aqueous solution by shaking with a suitable solvent is termed solvent extraction or differential extraction.
The organic compound present in aqueous layer moves to the organic solvent because:

1) the organic substance is more soluble in the organic solvent

2) organic compound being lighter moves in the upper layer

3) organic solvent is insoluble in water hence organic compound moves up

4) from the supersaturated aqueous solution the solute starts diffusing

On the basis of Le Chatellier principle, predict which of the following conditions would be unfavorable for the formation of SO3? Given that
2SO2 + O2 ↔ 2SO3 ; ΔH=-42 kcal 

1) Low pressure
2) High pressure
3)high temperature
4)high concentration of SO2

Glycerol is purified by

1) Steam distillation

2) Sublimation

3) Simple distillation

4) Vacuum distillation