Correct among the follownig...

Correct among the follownig

`BF_(3)` is a better Lewis base than `BCl_(3)`

`BF_(3)` does not form dimer as B-F bond is less polar.

Hydrides are the only species which may form 3 centre 2 `e^(-)` bond

All the hydrides form 3 centre i.e., bonds.

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The correct Answer is:

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Correct among the following is/are

Ortho hydrogen is thermodynamically more stable

Parahydrogen is kinetically more stable

At room temperature para hydrogn is major component

Ortho and para hydrogens always present in 50:50 ratio

Cs is best oxidising agent due to lowest I.E.

`Li^(+)` is best reducing agent due to highest `|Delta_(hyd)H^(Theta)|`

`Li^(+)` is best reducing agent due to highest `Delta_(hyd)H^(Theta)`

`Cs^(+)` is best oxidising agent due to low `|Delta_(hyd)H^(Theta)|`

The radius of `CI^(Θ)` ion is `1.56 Å` while that of `Na^(o+)` ion is `0.95Å` .

The radius of `CI` atom is `0.99` while that of Na atom is `1.54`

The radius of `CI` atom is `0.99` while that of `CI^( Θ)` ion is `0.81`

The radius of Na atom is 0.95 while that of `Na^(o+)` ion is `1.54` .