Types of Chemical Reactions

Q. Slaking of lime is
(i) an endothermic reaction
(ii) an exothermic reaction
(iii) a combination reaction
(iv) a decomposition reaction

1. 
   (i) and (iii)
2. 
   (i) and (iv)
3. 
   (ii) and (iii)
4. 
   (ii) and (iv)

Q.

What is the decomposition of ${\mathrm{FeSO}}_4$?

Q.

When a solution of ferrous sulphate (${\mathrm{FeSO}}_4$) is added to an acidified purple solution of potassium permanganate (${\mathrm{KMnO}}_4$). The purple colour fades and finally disappears. Which one of the following statements is correct?

1. The colour disappears because of dilution and no reaction occurs.

2. Potassium permanganate oxidizes ferrous sulphate and itself is reduced

3. Ferrous sulphate is an oxidizing agent and it oxidizes ${\mathrm{KMnO}}_4$

4. ${\mathrm{KMnO}}_4$, is a reducing agent and it reduces ${\mathrm{FeSO}}_4$.

Q.

Write two observations you make when quicklime is added to water.

Q.

The chemical reaction involved in the corrosion of iron metal is that of :

(a) oxidation as well as displacement (b) reduction as well as combination

(c) oxidation as well as combination (d) reduction as well as displacement

Q.

Is formation of silver chloride by the combination reaction of silver and chlorine a endothermic reaction?

Q. Name the three types of decomposition reaction and give one example for each.

Q.

What change in colour is observed when white silver chloride is left exposed to sunlight . State the type of and state the reaction

Q. The ratio of the volumes of gases liberated at anode and cathode respectively during the electrolysis of water is

1. 
   1 : 2
2. 
   2 : 1
3. 
   2 : 3
4. 
   3 : 2

Q.

An oxidizing agent is a substance which:

a. loses oxygen

b. gains hydrogen

c. gains oxygen

1. Only a

2. Only c

3. Only b

4. Both a and b

Q.

What kind of reaction is rusting of iron?explain.

Q.

What happens when ${\mathrm{SO}}_2$ is passed in an acidified ${\mathrm{KMnO}}_4$ solution?

Q.

How is photolythic decomposition used in photography, also write the reaction involved?

Q.

CH₃OH + CH₃COOH → CH₃COOCH₃ + H₂O

This reaction is an example of:

1. None of the above

2. Combination reaction

3. Photolytic Decomposition reaction

4. Electrolytic Decomposition reaction

Q.

Complete and balance the following equation :

${\mathrm{CaCO}}_3\to \mathrm{\_\_\_\_\_\_}+\mathrm{\_\_\_\_\_\_\_}$

Q.

Why is the decomposition reaction called the opposite of a combination reaction? Give examples for each.

Q. Which of the following reactions/processes proceed with the absorption of energy?

1. 
   Decomposition of silver bromide
2. 
   Decomposition of vegetable matter into compost
3. 
   Combustion of methane
4. 
   Respiration

Q. Identify the type of chemical reaction taking place when silver chloride turns black on exposure to sunlight.

1. Combination reaction
2. Displacement reaction
3. Double displacement reaction
4. Decomposition reaction

Q. Question 5.4
Translate the following statement into chemical equation and then balance it:

Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Q.

Identify the substance oxidized, substance reduced, oxidising agent and reducing agent.
$Mn{O}_2$ + $4HCl$ $\to$ $Mn{Cl}_2$ + $2H_{2}O$ + ${Cl}_2$.

Q.

What is decomposition reaction. Give three examples.

Q. Consider the given statements

Statement - I: Physical states of all reactants and products are same in a heterogeneous reaction

Statement - II: Physical states of all reactants and products are different in a homogeneous reaction

Now, choose the correct option

1. 
   Only statement I is correct
2. 
   Only statement II is correct
3. 
   Both the statements are correct
4. 
   Both the statements are incorrect

Q.

You are given with following material:

Ferrous sulphate crystals

Identify the type of chemical reaction taking place when:

On heating, green ferrous sulphate crystals, reddish-brown solid is left and gas having smell of burning sulphur is noticed.

Q.

Baking soda on thermal ___ gives sodium carbonate, water and carbon dioxide.

Q. Aqueous solution of barium chloride reacts with aqueous solution of sodium sulphate to produce

बेरियम क्लोराइड के जलीय विलयन की सोडियम सल्फेट के जलीय विलयन के साथ अभिक्रिया पर प्राप्त होता है

1. White precipitate of barium sulphate
   
   बेरियम सल्फेट का सफेद अवक्षेप
2. White precipitate of sodium chloride
   
   सोडियम क्लोराइड का सफेद अवक्षेप
3. Yellow precipitate of barium sulphate
   
   बेरियम सल्फेट का पीला अवक्षेप
4. Yellow precipitate of sodium chloride
   
   सोडियम क्लोराइड का पीला अवक्षेप

Q. In which of the following reactions, sulphur dioxide is not behaving as a reducing agent?

1. $H_{2}O+S{O}_2\to H_{2}S{O}_3$
2. $2H_{2}S+S{O}_2\to 3S+2H_{2}O$
3. $K_{2}C{r}_2{O}_7+H_{2}S{O}_4+3S{O}_2\to K_{2}S{O}_4+C{r}_2(S{O}_4{)}_3+H_{2}O$
4. Both (a) and (b)

Q. Number of moles of gaseous product(s) obtained when two moles of lead oxide react with one mole of solid carbon is

जब दो मोल लेड ऑक्साइड की एक मोल ठोस कार्बन के साथ अभिक्रिया होती है, तो प्राप्त गैसीय उत्पाद/उत्पादों के मोलों की संख्या है

1. 1
2. 2
3. 3
4. 4

Q.

(a) Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions.

(b) Express the following facts in the form fo a balanced chemical equation :

"When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed"

Q.

Is polymerization reversible?

Q. The gaseous products obtained on thermal decomposition of iron sulphate is

आयरन सल्फेट के ऊष्मीय अपघटन पर प्राप्त गैसीय उत्पाद हैं

1. SO₂ and O₂
   
   SO₂ तथा O₂
2. SO₃ and H₂S
   
   SO₃ तथा H₂S
3. SO₂ and SO₃
   
   SO₂ तथा SO₃
4. SO₂ and H₂S
   
   SO₂ तथा H₂S