मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

Rewrite the Following Statements by Selecting the Correct Options: Ce{Caco3 ->Delta Cao + Co2 ^}Is a __________ Reaction. - Science and Technology 1

Advertisements
Advertisements

प्रश्न

Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.

पर्याय

  • combination

  • displacement

  • double displacement

  • decomposition

MCQ

उत्तर

Decomposition

In decomposition reactions, one compound breaks down (or decomposes) to form two or more products. When calcium carbonate is heated, it forms calcium oxide and releases carbon dioxide.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
2016-2017 (March)

APPEARS IN

संबंधित प्रश्‍न

Why is the amount of gas collected in one of the test tubes in the following Activity double of the amount collected in the other? Name this gas.

  • Take a plastic mug. Drill two holes at its base and fit rubber stoppers in these holes. Insert carbon electrodes in these rubber stoppers as shown in the following Fig.
  • Connect these electrodes to a 6 volt battery.
  • Fill the mug with water such that the electrodes are immersed. Add a few drops of dilute sulphuric acid to the water.
  • Take two test tubes filled with water and invert them over the two carbon electrodes.
  • Switch on the current and leave the apparatus undisturbed for some time.
  • You will observe the formation of bubbles at both the electrodes. These bubbles displace water in the test tubes.
  • Is the volume of the gas collected the same in both the test tubes?
    • Once the test tubes are filled with the respective gases, remove them carefully.
  • Test these gases one by one by bringing a burning candle close to the mouth of the test tubes.

Caution: This step must be performed carefully by the teacher.

  • What happens in each case?
  • Which gas is present in each test tube?


Write the balanced chemical equation for the following and identify the type of reaction.

\[\ce{Zinc carbonate(s) -> Zinc oxide(s) + Carbon dioxide(g)}\]


Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.


Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity


The white solid compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps burn other things.
(a) What is compound A?
(b) What is compound B?
(c) What is gas C?
(d) What do you think is the black substance X? What is its function?
(e) What is the general name of substances like X?


Give one example of a decomposition reaction which is carried out by applying heat.


What type of chemical reaction is used to extract metals from their naturally occurring compounds like oxides or chlorides?


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

X → Y + Z

 


What type of reaction is represented by the following equation?

NH4NO2 → N2 + 2H2O


State the change in colour observed in following case mentioning the reason:

Silver chloride is exposed to sunlight.


Study the following figure and answer questions. 

a) After heating Calcium carbonate, which gas is formed in a test tube?
b) When we pass this gas through limewater what change, did you observe?
c) Write down the chemical reaction showing the product formation after heating the Calcium carbonate.

 


(a) Design an activity to demonstrate the decomposition reaction of lead nitrate.

(b) Draw labelled diagram of the experimental set-up. List two main observations.

(c) Write balanced chemical equation for the reaction stating the physical state of the reactant and the products.


Rewrite the following statement by selecting the correct option:
________________ is a decomposition reaction.

Answer the following question.
2 g of silver chloride is taken in a china dish and the china dish is placed in sunlight for some time. What will be your observation in this case? Write the chemical reaction involved in the form of a balanced chemical equation. Identify the type of chemical reaction.


Classify the following reaction into different type:

\[\ce{2KClO3(s)->[\Delta] 2KCl(aq) + 3O2(g)}\]


Give a balanced equation for –

A thermal decomposition reaction involving heat on limestone [calcium carbonate]


Differentiate between the following:

Thermal decomposition and thermal dissociation.


The chemical reaction in which two or more products are formed from a single reactant is called _______ reaction.


Explain the reaction given in the figure.


Photolysis is a decomposition reaction caused by ______


The following reaction is used for the preparation of oxygen gas in the laboratory:

\[\ce{2KClO3_{(s)} ->[Heat] 2KCl + 3O2_{(g)}}\]

Which of the following statement about the reaction is correct?


Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:


Which one of the following processes involves chemical reactions?


Which among the following statement(s) is (are) true?

Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride.

(ii) sublimation of silver chloride.

(iii) decomposition of chlorine gas from silver chloride.

(iv) oxidation of silver chloride.


Which of the following is an endothermic process?


Balance the following chemical equation and identify the type of chemical reaction.

`"HgO"("s") overset("(heat)")(->) "Hg"("l") + "O"_2("g")`


On heating blue coloured powder of copper (II) nitrate, in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed

  1. Write a balanced chemical equation of the reaction.
  2. Identify the brown gas X evolved.
  3.  Identify the type of reaction.
  4. What could be the pH range of aqueous solution of the gas X?

The reaction of calcium carbonate, with freshly prepared lime water, is shown below:

Answer the questions with the help of a diagram:

  1. What type of reaction does calcium carbonate undergoes?
  2. What change in colour is observed in lime?
  3. Write the chemical equation.


  1. Identify the gasses evolved at the anode and cathode in the above experimental set up.
  2. Name the process that occurs. Why is it called so?
  3. Illustrate the reaction of the process with the help of a chemical equation.

A metal nitrate 'A' on heating gives a metal oxide along with evolution of a brown coloured gas 'B' and a colourless gas, which helps in burning. Aqueous solution of 'A' when reacted with potassium iodide forms a yellow precipitate.

  1. Identify 'A' and 'B'
  2. Name the types of the reactions involved in the above statement.

Write the molecular formula of calcium carbonate.


Write one equation for decomposition reactions where energy is supplied in the form of electricity.


A solution of a substance ‘X’ is used for whitewashing.

  1. Name the substance ‘X’ and write its formula.
  2. Write the reaction of the substance ‘X’ named in the above formula with water.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×