JEE Main Test 27

Result

JEE Main Test 27

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Weekly Quiz Competition

Question 1
4 / -1

In gamma ray emission from a nucleus

A
only the neutron number changes

B
only the proton number changes

C
both the neutron number and the proton number change

D
there is no change in the proton number and the neutron number.

Solution

γ - ray emission takes place due to de-excitation of the nucleus.
Hence, option D is correct.
Question 2
4 / -1

Higher order (>3) reactions are rare due to:

A
low probability of simultaneous collision of all the reacting species

B
increase in entropy and activation energy as more molecules are involved

C
shifting of equilibrium towards reactants due to elastic collisions

D
loss of active species on collision

Solution

Higher order (> 3) reactions are rare due to low probability of simultaneous collision of all the reacting species.
Hence, option A is correct
Question 3
4 / -1

The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second inonization enthalpy?

A
V

B
Cr

C
Mn

D
Fe

Solution

Electronic configuration of V= [Ar]3d³4s²

Electronic configuration of Cr= [Ar]3d⁵4s¹

Electronic configuration of Mn= [Ar]3d⁵4s²

Electronic configuration of Fe= [Ar]3d⁶4s²

From the given electronic configurations, it can be easily seen that after losing one electron, chromium will attain the half-filled electronic configuration which is quite stable. Hence, it will be difficult to remove second electron from the d-orbital. Thus, chromium will have the highest second ionization enthalpy among the given elements.