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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?
Give an example of a double displacement reaction other than the one given in the following Activity.
•Take about 3 mL of sodium sulphate
solution in a test tube.
• In another test tube, take about 3 mL of
barium chloride solution.
• Mix the two solutions given in the following fig.
• What do you observe?
Write the balanced chemical equation for the following and identify the type of reaction.
\[\ce{Potassium bromide (aq) + Barium iodide (aq) -> Potassium iodide (aq) + Barium bromide (s)}\]
What is the difference between displacement and double displacement reactions? Write equations for these reactions.
What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
What type of chemical reaction is represented by the following equation?
\[\ce{PQ + RS -> PS + RQ}\]
What type of reaction is represented by the following equation?
\[\ce{CuSO4 + 2NaOH -> Cu(OH)2 + Na2SO4}\]
What happens when silver nitrate solution is added to sodium chloride solution?
Name the type of reaction involved.
- What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride?
- Write the balanced chemical equation for the reaction which takes place.
- State the physical conditions of reactants in which the reaction will not take place.
- Name the type of chemical reaction which occurs.
- Give one example of another reaction which is of the same type as the above reaction.
Consider the reaction:
\[\ce{KBr_{(aq)} + AgNO3_{(aq)} -> KNO3_{(aq)} + AgBr_{(s)}}\]
This is an example of:
A metal X forms a water soluble salt XNO3. When an aqueous solution of XNO3 is added to common salt solution, then a white precipitate of compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrohloric acid.
- What is metal X?
- What is salt XNO3?
- Name the compound Y.
- Write the chemical equation of the reaction which takes place on reacting XNO3 solution and common salt solution giving the physical states of all the reactants and products.
- What type of chemical reaction is illustrated by the above equation?
A red-brown metal X forms a salt XSO4. When hydrogen sulphide gas is passed through an aqueous solution of XSO4, then a black precipitate of XS is formed alongwith sulphuric acid solution.
- What could the salt XSO4 be?
- What is the colour of salt XSO4?
- Name the black precipitate XS.
- By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.
- What type of chemical reaction takes place in this case?
Explain the following type of chemical reaction, giving two examples for it:
Double displacement reaction
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
Choose and write the correct option.
What is the type of the following reaction?
BaCl2 + ZnSO4 → BaSO4 + ZnCl2
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.
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a:
Identify the type of reaction taking place in the following case and write the balanced chemical equation for the reaction.
Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.
Differentiate between displacement reaction and a neutralization reaction.
Classify the following reaction into –
- Direct combination
- Decomposition
- Displacement
- Double decomposition
The reaction is – Zinc sulphate reacts with ammonium hydroxide to give ammonium sulphate and zinc hydroxide.
Explain the types of double displacement reactions with examples.
Which option denotes a double displacement 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) \[\ce{CH4 + 2O2 -> CO2 + 2H2O}\]
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
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?
Balance the following chemical equation and identify the type of chemical reaction.
`"TiCl"_4("l") + "Mg"("s") -> "Ti"("s") + "MgCl"_2("s")`
Add potassium chromate (K2CrO4) into the solution of barium sulphate (BaSO4).
- What was the colour of the precipitate formed? Also, write the name of the precipitate.
- Write down the balanced equation for this reaction.
- Will you call this reaction a displacement reaction or a double displacement reaction? Why?
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.
