Chemistry Sample Test Paper 3 - AIEEE 2009

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(SOLVED)
Note : All Answers are in red.

1. Which will not exist
NCl₅
IF₇
OF₄
bI₂

2. Assertion : Ionic compounds tend to be non-volatile. Reason : Intermolecular forces in these compounds are weak.
A
B
C
D

3. Assertion : Water is a good solvent for ionic compounds but poor one for covalent compounds. Reason : Hydration energy of ions releases sufficient energy to ovecome lattice energy and break hydrogen bonds in water while covalent bonded compounds interact so weakly that even van der Waal s forces between molecules of the covalent compounds cannot be broken.
A
B
C
D

4. Assertion : Na₂SO₄ is soluble in water while BaSO₄ is insoluble. Reason : Lattice energy of BaSO₄ exceeds its hydration energy.
A
B
C
D

5. Assertion : p_y and p_z cannot combine to give molecular orbital. Reason : Both p_y and p_z are dumb-bell shaped.
A
B
C
D

6. Assertion : The atoms in a covalent molecule are said to share electrons, yet some covalent molecules are polar. Reason : In polar covalent molecule, the shared electrons spend more time on the average near one of the atoms.
A
B
C
D

7. Assertion : The bond angle of PBr₃ is greater than PH₃ but the bond angle of NBr₃ is less than NH₃. Reason : Electronegativity of phosphorus atom is less than that of nitrogen.
A
B
C
D

8. Assertion : Although PF₅, PCl₅ and PBr₅ are known, the pentahalides of nitrogen have not been observed Reason : Phosphorus has lower electronegativity than nitrogen.
A
B
C
D

9. Assertion : BO₃^3- and CO₃^2- possess plane triangular shape. Reason : The central atoms in these species are in sp² state of hybridization.
A
B
C
D

10. Assertion : NO₃^_ is planar while NH₃ is pyramidal. Reason : N in NO₃^- is sp² and in NH₃ it is sp³ hybridized.
A
B
C
D