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Standard XII

Chemistry

Heat of Formation

Gradual addit...

Question

Gradual addition of $K I$ solution to $B i (N O_{3})_{3}$ solution initially produces a dark brown precipitate which dissolves in excess of $K I$ to give a clear yellow solution. Reaction equation is given by :
$B i I_{x} + K I ⟶ K [B i I_{y}]$ . Determine x and y.

x = 3, y = 4

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x = 2, y = 2

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x = 2, y = 3

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x = 4, y = 3

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Solution

The correct option is A $x = 3, y = 4$
Bi belongs to nitrogen family (group VA).
Due to inert pair effect, it forms compounds in +3 oxidation state.
Thus, $x = 3$
The value of y can be calculated by balancing the charges in $K [B i I_{y}]$ .
$+ 1 + 3 + y (- 1) = 0$
$+ 1 + 3 - y = 0$
$y = 4$

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Gradual addition of KI solution to Bi(NO3)3 solution initially produces a dark brown precipitate which dissolves in excess of KI to give a clear yellow solution. Reaction equation is given by :BiIx+KI⟶K[BiIy]. Determine x and y.

The correct option is A x=3,y=4Bi belongs to nitrogen family (group VA).Due to inert pair effect, it forms compounds in +3 oxidation state.Thus, x=3The value of y can be calculated by balancing the charges in K[BiIy].+1+3+y(−1)=0+1+3−y=0y=4

Gradual addition of $K I$ solution to $B i (N O_{3})_{3}$ solution initially produces a dark brown precipitate which dissolves in excess of $K I$ to give a clear yellow solution. Reaction equation is given by :
$B i I_{x} + K I ⟶ K [B i I_{y}]$ . Determine x and y.

The correct option is A $x = 3, y = 4$
Bi belongs to nitrogen family (group VA).
Due to inert pair effect, it forms compounds in +3 oxidation state.
Thus, $x = 3$
The value of y can be calculated by balancing the charges in $K [B i I_{y}]$ .
$+ 1 + 3 + y (- 1) = 0$
$+ 1 + 3 - y = 0$
$y = 4$