What is a portal system?

  • A
    $A$ vein that starts from an organ and ends in the heart.
  • B
    An artery that divides in an organ and reforms by the union of its capillaries.
  • C
    Blood entering the heart after passing from the digestive tract to the kidneys.
  • D
    $A$ vein that starts as capillaries in one organ and ends as capillaries in another organ before returning to the heart.

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The increasing order of magnetic moments of the following complexes is:-
$I. [Fe(CN)_6]^{4-}$
$II. [Fe(CN)_6]^{3-}$
$III. [Cr(NH_3)_6]^{3+}$
$IV. [Ni(H_2O)_4]^{2+}$

Two infinite length wires carry currents $8A$ and $6A$ respectively and are placed along the $X$ and $Y$-axes. The magnetic field at a point $P(0, 0, d) \ m$ will be:

Four successive members of the first series of the transition metals are listed below. For which one of them the standard electrode potential $(E^o_{M^{2+}/M})$ value has a positive sign?

Urea upon hydrolysis yields:

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