In how many of the following reactions, one of the products is obtained as a yellow precipitate?

$B a^{2 +} + C r O_{4}^{2 -} ⟶ P r o d u c t$
$H g^{2 +} + C o^{2 +} + S C N^{-} ⟶ P r o d u c t$
$N H_{4}^{+} + [P t C l_{6}]^{2 -} ⟶ P r o d u c t$
$A g^{+} + C r O_{4}^{2 -} ⟶ P r o d u c t$
$N H_{4}^{+} + [C o (N O_{2})_{6}]^{3 -} ⟶ P r o d u c t$

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Solution

In three reactions, one of the products is obtained as a yellow precipitate.
$B a^{2 +} + C r O_{4}^{2 -} \to B a C r O_{4} ↓ (y e l l o w)$
$H g^{2 +} + C o^{2 +} + S C N^{-} ⟶ H g [C o (S C N)_{4}]$
$N H_{4}^{+} + [P t C l_{6}]^{2 -} ⟶ (N H_{4})_{2} [P t C l_{6}]$
$A g^{+} + C r O_{4}^{2 -} ⟶ A g_{2} C r O_{4} ↓ (r e d)$
$N H_{4}^{+} + [C o (N O_{2})_{6}]^{3 -} ⟶ (N H_{4})_{3} [C o (N O_{2})_{6}]$

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