English
Maharashtra State BoardSSC (English Medium) 10th Standard

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

Advertisements
Advertisements

Question

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

Options

  • combination

  • displacement

  • double displacement

  • decomposition

MCQ
Advertisements

Solution

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
  Is there an error in this question or solution?
2016-2017 (March)

APPEARS IN

RELATED QUESTIONS

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


A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.

  1. What is substance P? Write its common name as well as chemical formula.
  2. What is substance Q?
  3. What is gas R?
  4. What is substance S? What is its clear solution known as?
  5. What is substance T? Name any two natural forms in which substance T occurs in nature.

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.

  1. What is compound A?
  2. What is compound B?
  3. What is gas C?
  4. What do you think is the black substance X? What is its function?
  5. What is the general name of substances like X?

State an important use of decomposition reactions.


Give one example of a decomposition reaction which is carried out with electricity.


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


What type of reaction is represented by the following equation?

\[\ce{CaCO3 -> CaO + CO2}\]


What type of reaction is represented by the following equation?

\[\ce{NH4Cl -> NH3 + HCl}\]


What type of chemical reaction takes place when electricity is passed through water?


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

\[\ce{X -> Y + Z}\]


What type of reaction is represented by the following equation?

\[\ce{NH4NO2 -> N2 + 2H2O}\]


What is meant by a decomposition reaction?


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

Silver chloride is exposed to sunlight.


Which of the following can be decomposed by the action of light?


Two metals X and Y form the salts XSO4 and Y2SO4, respectively. The solution of salt XSO4 is blue in colour whereas that of Y2SO4 is colourless. When barium chloride solution is added to XSO4 solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to Y2SO4 solution, then the same white precipitate Z is formed along with colourless common salt solution.

  1. What could the metals X and Y be?
  2. Write the name and formula of salt XSO4.
  3. Write the name and formula of salt Y2SO4.
  4. What is the name and formula of white precipitate Z?
  5. Write the name and formula of the salt which turns the solution green in the first case.

What are thermal decomposition reactions ? Explain with an example.


Give a scientific reason.

When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.


Identify the type of following reaction :


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 student wants to study a decomposition reaction by taking ferrous sulphate crystals. Write two precautions he must observe while performing the experiment. 


How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?


Give a balanced equation for –

An electrolytic decomposition reaction involving a neutral liquid


Differentiate between the following:

Thermal decomposition and thermal dissociation.


Photolysis is a decomposition reaction caused by ______


Electrolysis is type of ______ reaction.


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.


Assertion: Decomposition of vegetable matter into compost is an endothermic reaction.

Reason: Decomposition reaction involves breakdown of a single reactant into simpler products.


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.


These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Assertion: Silver bromide decomposition is used in black and white photography.

Reason: Light provides energy for this exothermic reaction.


  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 the decomposition reaction where energy is supplied in the form of electricity.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×