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Standard XII

Chemistry

1900's Physics and Wave

the ionic rad...

Question

the ionic radii of A^+and b ions are 0.98×10^{-10} mand 1.81×10^{-10} m.the coordination no of each ion in AB is

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Q. The ionic radii of

A^{+}

and

B^{-}

ions are

0.98 \times 10^{- 10}

m and

1.81 \times 10^{- 10}

m. The coordination number of each ion in

A B

The ionic radii of $A^{+}$ and $B^{-}$ ions are $0.98 \times 10^{- 10} m$ and $1.81 \times 10^{- 10} m$ . The coordination number of each ion in AB is

Q. If the concentration of

A^{+}

ions in a solution of a sparingly soluble salt,

A B

10^{- 3} M .

Find the concentration of

B^{-}

ions at which the precipitation of

A B

starts.
Given : Solubility product of AB is

1.0 \times 10^{- 8}

Q. A solution is 0.1 M in each of

{P O}_{4}^{3 -}, {S O}_{4}^{- 3}

and

{C l}^{-}

ions. Solid

{A g N O}_{3}

is added gradually to this solution which causes no change in volume of the solution. Given

K_{a p} (A g C l) = 1.8 \times 10^{- 10}

K_{a p} ({A g}_{2} {S O}_{4}) = 1.21 \times 10^{- 3}

and

K_{a p} ({A g}_{3} {S O}_{4}) = 2.7 \times 10^{- 18}

.
The concentrations of first and third ions when the second ion starts precipitating, respectively, are:

Q. Assertion : Formula mass (in grams) of magnesium chloride has

12.044 \times 10^{23}

magnesium ions. Reason : One formula mass of an ionic compound has

6.022 \times 10^{23}

ions of each type.

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