Decomposition Reaction

Q.

Balance this equation: $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\to \mathrm{PbO}+{\mathrm{NO}}_2+{\mathrm{O}}_2$

Q. Lead nitrate on thermal decomposition produces:

1. Lead oxide
2. Nitrogen dioxide
3. Nitrogen trioxide
4. Carbon dioxide

Q.

Balance this equation with steps: ${\mathrm{C}}_2{\mathrm{H}}_6+{\mathrm{O}}_2\to {\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$

Q.

Balance the following equation: ${\mathrm{NH}}_3+{\mathrm{O}}_2\to \mathrm{NO}+{\mathrm{H}}_2\mathrm{O}$

Q.

What happens when silver chloride is exposed to sunlight ? Write a chemical equation for this reaction. Also give one use of such a reaction.

Q.

Some examples for electrolytic decomposition reaction.

Q.

2 gram of Lead Nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. Now answer the following

(A) State the colour of the fumes evolved and the Residue left.

(B) Name the type of chemical reaction that has taken place stating its balanced chemical equation

Q. Question 26

Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Q.

Silver chloride and silver bromide are used in black and white photography.Which of the following are correct in regard to these reactions?

(i) Energy in the form of light is required for the reactions to occur.

(ii) Both the reactions are endothermic.

(iii) Only silver chloride decomposes into solid metal and non - metal gas.

(iv) Both compounds decompose into their respective metal and non - metal gases.

1. (ii), (iii)

2. (ii), (iii), (i)

3. (i), (ii), (iv)

4. (i), (iv)

Q.

Balance the following chemical equation:

${\mathrm{SO}}_2+{\mathrm{H}}_2\mathrm{S}\to {\mathrm{H}}_2\mathrm{O}+\mathrm{S}$

Q.

What change in colour is observed when white silver chloride is left exposed to sun light, state the type of chemical reaction in this change

Q. What is thermal, photolytic and electrolysis decomposition?

Q.

Define the term decomposition reaction?

Q.

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.

(a) Name the iron salt.

(b) Name the type of reaction that takes place during the heating of iron salt.

(c) Write a chemical equation for the reaction involved.

Q.

Question 39

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

(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identity the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?

Q.

What happens when quick lime is added to water?

Q.

What happens when electric current is passed through acidified water? Name the type of reaction involved.

Q.

What Are Thermal Decomposition Reactions? Explain With An Example.

Q.

A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water . What change would be observed in lime water ? What will happen if excess gas is passed through the lime water ? With the help of Balanced chemical equation for all the changes explain the observation.

Q. Question 4
What will happen if the solution of sodium hydrogen carbonate is heated? Give the equation of the reaction involved.

Q.

Write balanced chemical equations for the following chemical reactions.

(a) Hydrogen+ Chlorine → Hydrogen Chloride

(b) Lead+ Copper Chloride → Lead Chloride + Copper

(c) Zinc Oxide + Carbon → Zinc + Carbon Monoxide

Q.

Write the balanced chemical equation of the following word equation

$\text{Potassium Dichromate + Sulphuric Acid → Potassium Sulphate + Chromium Sulphate + Water + Oxygen}$

Q.

Name the type of following Chemical reaction $\underset{\mathrm{Calcium}\mathrm{carbonate}}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}\to \underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$

Q.

A colourless lead salt, when heated, produces a yellow residue and brown fumes.

(a) Name the lead salt.

(b) Name the brown fumes.

(c) Write a chemical equation of the reaction involved.

Q.

$\underset{\mathrm{Potassium}\mathrm{dichromate}}{{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\left(\mathrm{s}\right)}+\underset{\mathrm{Sulfuric}\mathrm{acid}}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}+\underset{\mathrm{Sulfur}\mathrm{dioxide}}{{\mathrm{SO}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Potassium}\mathrm{sulfate}}{{\mathrm{K}}_2{\mathrm{SO}}_4\left(\mathrm{s}\right)}+\underset{\mathrm{Chromium}\mathrm{sulfate}}{{\mathrm{Cr}}_2{\left({\mathrm{SO}}_4\right)}_3\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$ Balance by partial equation method.

Q.

A metal salt MX when exposed to light splits up to form metal M and a gas $X_2$. Metal M is used in making ornaments whereas gas $X_2$ is used in making bleaching powder. The salt MX is itself used in black and white photography.

(a) What do you think metal M is ?

(b) What could be gas $X_2$ ?

(c) Name the metal salt MX.

(d) Name any two salt solutions which on mixing together can produce a precipitate of salt MX.

(e) What type of chemical reaction takes place when salt MX is exposed to light ? Write the equation of the reaction.

Q.

Is decomposition of vegetable is exothermic or endothermic reaction? If it is exothermic reaction than what type of decomposition reaction is this?

Q.

Balance the following skeletal equations.

${\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{H}}_2\to \mathrm{Fe}+{\mathrm{H}}_2\mathrm{O}$

Q.

What is a skeletal reaction?

Q.

Balance each one of the following chemical equations:

${\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$