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Questions  

In an experiment, đť‘š grams of a compound X (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below. In the presence of a magnetic field, the pan with X is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound X. 

Identify the correct statement(s)

 

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By Expert Faculty of Sri Chaitanya
a
If X is H2O(l), deflection of the pan is upwards.
b
If X is K4Fe(CN)6(s), deflection of the pan is upwards.
c
If X is O2(g), deflection of the pan is downwards.
d
If X is C6H6(l), deflection of the pan is downwards.

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detailed solution

Correct option is A

Paramagnetic compound (X) are attracted towards magnetic field and the pan is deflected downwards. While the Diamagnetic compound (X) are repelled by magnetic field and pan is deflected upward.(A) X⇒H2O→Diamagnetic (correct)(B) X⇒K4Fe(CN)6(s)→ Diamagnetic (correct)  Here Fe2++ Strong field ligand â†’3d6⇒t2g6,eg0 (C) X⇒O2→ Paramagnetic (correct) Here O2(g) is paramagnetic due to two-unpaired electrons present in Ď€* (antibonding orbitals). (D) X⇒C6H6(â„“)→ Diamagnetic (Incorrect) It is due to presence of 0 unpaired electrons
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