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Reaction of l...

Question

Reaction of liquid potassium chromate and barium nitrate solution form solid barium chromate which characteristic of chemical reaction

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Solution

Dear Student

Reaction is as:
K₂CrO₄ (l) + Ba(NO₃)₂ (l) = BaCrO₄ (s) + 2 KNO₃ (l)
This chemical reaction is called as double displacement reaction as exchange of ions is done between both the reactants.
This chemical reaction is also called as precipitation reaction as precipitate of barium chromate is formed.

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Q. When potassium chromate is added to the solution of barium sulphate, a precipitate of barium chromate is formed. What is the colour of it?

Q. Write the balanced chemical equation when lead(II) nitrate reacts with potassium chromate.

Q. Determine the solubilities of silver chromate, barium chromate, ferric hydroxide, lead chloride and mercurous iodide at 298 K from their solubility product constants. Determine also the molarities of individual ions.
The solubility product constants are:
Silver chromate,

1.1 \times 10^{- 12}

Barium chromate,

1.2 \times 10^{- 10}

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1.0 \times 10^{- 38}

Lead dichloride,

1.6 \times 10^{- 5}

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Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide

+

\to

Zinc oxide solid

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Sulphur dioxide gas
ii) Silver nitrate solution

+

Sodium chloride solution

\to

Silver chloride precipitate

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Sodium nitrate solution
iii) Sulphur solid

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Concentrated nitric acid

\to

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Nitrogen dioxide gas

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Water
iv) Barium chloride Solution

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Potassium sulphate Solution

\to

Barium sulphate Precipitate

+

Potassium chloride solution
v) Silver nitrate on heating

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nitrogen dioxide gas

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(a) Give one example of a chemical reaction.

(b) State two characteristics of the chemical reaction which takes place when dilute sulphuric acid is poured over zinc granules.

(c) Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution.

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