JEE Main Test 48

Result

JEE Main Test 48

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Weekly Quiz Competition

Question 1
4 / -1

The hydration energy of Mg²⁺ is larger than that of

A
AI³⁺

B
Na⁺

C
Be²⁺

D
Mg³⁺

Solution

The cation with a higher charge density has a greater heat of hydration.

The order is: Na⁺ < Mg⁺² < Mg⁺³ < Al⁺³

Because of the smaller size of Mg²⁺ than Na⁺ (both are isoelectronic with higher nuclear charge on Mg²⁺), the hydration energy of Mg²⁺ is larger than that of Na⁺.
Question 2
4 / -1

Which one of the following species is not a pseudohalide?

A
CNO^-

B
RCOO^-

C
OCN^-

D
NNN^-

Solution

Pseudohalides are monovalent anions that have properties similar to those of halide ions.

The corresponding dimers of pseudohalides are known as pseudohalogens.

RCOO^- is not a pseudohalide.
Question 3
4 / -1

The correct order of E^o_M²⁺_/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is:

A
Cr > Mn > Fe > Co

B
Mn > Cr > Fe > Co

C
Cr > Fe > Mn > Co

D
Fe > Mn > Cr > Co

Solution

Mn > Cr > Fe > Co

This order is also the order of decreasing stability of the oxidations states of the species involved.

E^o_Mn²⁺_/Mn = -1.18 V

E^o_Cr²⁺_/Cr = -0.56 V

E^o_Fe²⁺_/Fe = -0.44 V

E^oCo²⁺/Co = -0.28 V