Decomposition Reaction

Q.

(a) When you have mixed the solutions of lead(II) nitrate and potassium iodide,
(i) what was the colour of the precipitate formed and can you name the precipitate?
(ii) write the balanced chemical equation for this reaction.

(b) What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Q.

What are some real-life double displacement reaction examples?

Q. Wreite the balanced chemical equation of the following word equation.
$\left(p\right)$ Potassium dichromate $+$ hydrochloric acid $\to$ potassium chloride $+$ chromium chloride $+$ water $+$chlorine

Q. Balance the following equation:
f) $P{b}_3{O}_4\to PbO+O_2$

Q.

What are some examples of decomposition reactions?

Q.

Difference between thermal decomposition and thermal dissociation

Q. Balance the following equation:
e) $PbO+N{H}_3\to Pb+H_{2}O+N_2$

Q. Write chemical equations for the following word equation and balance them.
e) Magnesium + Sulphuric acid → Magnesium sulphate + Hydrogen

Q. Give an example of each of the following chemical changes:
(b) A reaction involving
(ii) formation of dirty green precipitate

Q. The decomposition of hydrogen peroxide is a first-order reaction. The half-life of the reaction is 17.0 minutes. What is the rate constant of the reaction?

1. 0.0508
2. 0.0712
3. 0.0408
4. 0.0612

Q. Identify the type of chemical reaction wherein Silver chloride, originally white in colour, turns dark upon exposure to sunlight.

1. Photolytic decomposition
2. Electrolytic decomposition
3. Thermal decomposition
4. Combination reaction

Q.

The number of reactants in a decomposition reaction is:

1. Two

2. Three

3. Four

4. One

Q. Name​
(c) a compound which produces carbon dioxide on heating.​

Q.

What are the products of thermal decomposition of $Ba{O}_2$?

1. $BaO$

2. $Ba$

3. $O_2$

4. $O_3$

Q. Question 34

Why do we store silver chloride in dark coloured bottles?

Q.

In an experiment when heat is supplied to potassium chlorate (KClO₃) it gives potassium chloride (KCl) and oxygen. What type of reaction is this?

1. Combination reaction

2. Endothermic reaction

3. Exothermic reaction

4. Decomposition reaction

Q.

Which one of the following reactions is an example of decomposition reaction?

1. 

2. 

3. 

4. 

Q. Which of the following is not a compound?

1. Marble
2. Washing Soda
3. Quicklime
4. Brass
   

Q.

Give reason for the following :

(a) Silver nitrate solution is kept in coloured bottles.

(b) Molybdenum is used in the manufacture of ammonia.

(c) Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.

Q.

Iodine is used in photography in the form of silver iodide.

1. True
2. False

Q. KCl is an example of acidic salt.

1. True
2. False

Q.

The formation of copper oxide from copper in the presence of oxygen is an ____________ reaction.

$2Cu+O_2\to 2CuO$

1. Reduction

2. Decompositon

3. Oxidation

4. Displacement

Q.

Iron (III) chloride is acidic while sodium carbonate is basic. Explain.

Q.

Indicate the type of the following reaction :

${\mathrm{NH}}_4\mathrm{Cl}\to {\mathrm{NH}}_3+\mathrm{HCl}$

Q. Write chemical equations for the following word equation and balance them.​

f) Sodium reacts with water to form sodium hydroxide and hydrogen.​

Q. Why are decomposition reactions called the opposite of combination reactions? Write an equation for these reactions.

Q.

What is decomposition ? Support your answer by an example.

Q. Balance the following equation:
a) $Fe+H_{2}O\to F{e}_3{O}_4+H_2$

Q. Balance the following equation: h) $S+H_{2}S{O}_4\to S{O}_2+H_{2}O$

Q. State the type of reactions each of the following represent and balance the ones that are not balanced.
(b)$NaOH+HCl\to NaCl+H_{2}O$