मराठी

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

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प्रश्न

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

लघु उत्तर
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उत्तर

On adding potassium iodide solution to lead nitrate solution, yellow precipitates of lead iodide are formed, and the colour of the solution changes from colourless to yellow. Hence, formation of a precipitate and a change in colour are the characteristics of this chemical reaction.

\[\ce{2KI_{(aq)} + Pb(NO3)2_{(aq)} -> PbI2_{(s)} + 2KNO3_{(aq)}}\]

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पाठ 1: Chemical Reactions and Equations - Exercise 1 [पृष्ठ २९]

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लखमीर सिंह Chemistry Part 2 [English] Class 10
पाठ 1 Chemical Reactions and Equations
Exercise 1 | Q 17. (c) | पृष्ठ २९

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संबंधित प्रश्‍न

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  1. What do you think substance A is likely to be?
  2. Name the precipitate.
  3. Which type of reaction is this?

What is the difference between displacement and double displacement reactions? Write equations for these reactions.


What do you mean by a precipitation reaction? Explain giving an example.


What type of chemical reaction is represented by the following equation?

\[\ce{PQ + RS -> PS + RQ}\]


What is meant by a double displacement reaction? Explain with the help of one example.


  1. What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride?
  2. Write the balanced chemical equation for the reaction which takes place.
  3. State the physical conditions of reactants in which the reaction will not take place.
  4. Name the type of chemical reaction which occurs.
  5. Give one example of another reaction which is of the same type as the above reaction.

Fill in the blank

In the type of reaction called ....................................., ions two compounds exchange their positive and negative radicals ions respectively.


The aqueous solutions of copper sulphate and zinc sulphate appear

(A) blue and green respectively

(B) green and colourless respectively

(C) blue and brown respectively

(D) blue and colourless respectively.


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(A) I and II

(B) II and III

(C) III and I

(D) All the three


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Explain the types of double displacement reactions with examples.


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(i) \[\ce{Pb + CuCl -> PbCl2 + Cu}\]

(ii) \[\ce{Na2SO4 + BaCl2 -> BaSO4 + 2NaCl}\]

(iii) \[\ce{C + O2 -> CO2}\]

(iv) \[\ce{CH4 + 2O2 -> CO2 + 2H2O}\]


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Add potassium chromate (K2CrO4) into the solution of barium sulphate (BaSO4).

  1. What was the colour of the precipitate formed? Also, write the name of the precipitate.
  2. Write down the balanced equation for this reaction.
  3. Will you call this reaction a displacement reaction or a double displacement reaction? Why?

Identify the product which represents the solid state in the above reaction.


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Lead nitrate + Potassium iodide → Lead iodide + Potassium nitrate

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Give scientific reason.

While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.


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