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प्रश्न
Give scientific reason.
It takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.
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उत्तर
- The rate of a chemical reaction depends upon the size of the reactant particles taking part in the reaction.
- Smaller the size of the reactant particles, higher is the rate of reaction.
- The size of reactant particles is more in pieces of Shahabad tile as compared to powder of Shahabad tile.
- When HCl is added to pieces of Shahabad tile, the CO2 effervescence is formed slowly. However, when HCl is added to Shahabad powder, the CO2 effervescence is formed at a faster rate.
Hence, it takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.
संबंधित प्रश्न
When the substance ‘A’ is added to a solution of BaSO4, a yellow precipitate is formed.
- What do you think substance A is likely to be?
- Name the precipitate.
- Which type of reaction is this?
Write the balanced chemical equation for the following and identify the type of reaction.
\[\ce{Potassium bromide (aq) + Barium iodide (aq) -> Potassium iodide (aq) + Barium bromide (s)}\]
Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution.
What type of chemical reaction is represented by the following equation?
PQ + RS → PS + RQ
What type of reaction is represented by the following equation?
CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4
What is meant by double displacement reaction? Explain with help of one example.
What happens when silver nitrate solution is added to sodium chloride solution?
Name the type of reaction involved.
(a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride?
(b) Write the balanced chemical equation for the reaction which takes place.
(c) State the physical conditions of reactants in which the reaction will not take place.
(d) Name the type of chemical reaction which occurs.
(e) Give one example of another reaction which is of the same type as the above reaction.
Consider the reaction:
KBr (aq) + AgNO3 (aq) → KNO3 (aq) + AgBr (s)
This is an example of:
(a) decomposition reaction
(b) combination reaction
(c) double displacement reaction
(d) displacement 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.
Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solutions. After some time a change will be observe in
(A) I and II
(B) II and III
(C) III and I
(D) All the three
(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
(ii) What type of reaction is this?
(iii) Write a balanced chemical equation to represent the above reaction.
Study the following chemical reaction and answer the questions given below:
\[\ce{AgNO3_{(aq)} + NaCl_{(aq)} -> \underset{(Precipitate)}{AgCl_{(s)}}↓ + NaNO3_{(aq)}}\]
- Identify and write the type of chemical reaction.
- Write the definition of the above type of chemical reaction.
- Write the names of the reactants and products of the above reaction.
If sodium chloride is added to the silver nitrate solution:
a. which precipitate is formed?
b. name the type of reaction.
c. write the chemical equation.
In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
- exchange of atoms takes place
- exchange of ions takes place
- a precipitate is produced
- an insoluble salt is produced
The correct option is:
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
List two types of reactions in which this reaction can be placed.
Differentiate between displacement reaction and a neutralization reaction.
Which of the following represents a precipitation reaction?
Which among the following is (are) double displacement reaction(s)?
(i) \[\ce{Pb + CuCl -> PbCl2 + Cu}\]
(ii) \[\ce{Na2SO4 + BaCl2 -> BaSO4 + 2NaCl}\]
(iii) \[\ce{C + O2 -> CO2}\]
(iv) \[\ce{CH4 + 2O2 -> CO2 + 2H2O}\]
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
Identify the product which represents the solid state in the above reaction.
Write balanced chemical equation for the following word equation.
Lead nitrate + Potassium iodide → Lead iodide + Potassium nitrate
Is this a double displacement reaction? Justify your answer. Name the compound precipitated and write the ions present in it.
Write the method of preparation of Ca(OH)2. What happens when CO2 is passed through it? Write balanced chemical equation for the reaction involved.
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.
Give an example of a double displacement reaction.
