JEE Main Test 14

Result

JEE Main Test 14

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by

A
metallic bonding

B
ionic bonding

C
covalent bonding

D
van der Waals bonding

Solution

The Van der Waals force of attraction is attributed to the force between the molecules of a fluid. The conductivity of the semiconductor increases with the increase in the temperature and is dependent on the covalent bonding whereas the conductivity of the metals(metallic bonding0 decreases with the increase in the temperature. For insulators, the conductivity increases with the increase in the temperature.
Question 2
4 / -1

Larger number of oxidiation states are exhibited by the actinoids than those by the lanthanoids the main reason being

A
Due to more energy difference between 5f and 6d than between 4f and 5d orbitals

B
Because of more reactive nature of the actinoids than the lanthanoids

C
Because 4f orbitals more diffused than the 5f orbitals

D
Due to lesser energy difference between 5f and 6d than between 4f and 5d orbitals

Solution

This is because of comparatively lesser difference in the energies of 5f and 6d than 4f and 5d orbitals.
Question 3
4 / -1

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

A
Metal sulphides are less stable than the corresponding oxides

B
CO₂ is more volatile than CS₂

C
Metal sulphides are thermodynamically more stable than CS₂

D
CO₂ is thermodynamically more stable than CS₂

Solution

We know that metal suphides are more stable than CS₂ and therefore cannot be reduced using that.

Similarly, above certain temperatures, metal oxides are less stable than CO₂ and therefore can be reduced by CO₂ very easily.

The fact that CO₂ is more or less volatile than CS₂ is of no significance in the process. Only the relative stability of oxides with CO₂ and sulphides with CS₂ is important.