JEE Main Test 9

Result

JEE Main Test 9

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following are isoelectronic species?

A
N^2-, O^2-, F^-

B
Al⁺³, Cl^-, Ar

C
Mg⁺², K⁺, Cl^-

D
Na⁺, F^-, Ne

Solution

All Na⁺, F^- and Ne have 10 electrons each and hence are isoelectronic species.
Question 2
4 / -1

If z, w be complex numbers such that z’+iw’=0 and arg(zw)=π, then arg(z)=

A
π/4

B
5 π/4

C
3 π/4

D
π/2

Solution

w’=-z’/i

So (w’)’=(-z’/i)’

Or w=z/i

Therefore arg(z.z/i)= π

Or 2*arg(z)-arg(i)= π

Or 2*arg(z)- π/2= π

Or 2*arg(z)=3 π/2

Or arg(z)=3 π/4