Endothermic and Exothermic Reaction

Q.

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

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

1. Both Assertion and Reason are false.

2. Assertion is false, but Reason is true.

3. Both Assertion and Reason are true. The reason is the correct explanation of Assertion.

4. Both Assertion and Reason are true. The reason is not the correct explanation of Assertion.

Q.

Identify the type of chemical reaction in the following statements and define each of them:
(a) Digestion of food in our body

(b) Rusting of iron.

(c) Heating of manganese dioxide with aluminum powder

(d) Blue color of copper sulfate solution disappears when iron filings are added to it.

(e) Dilute hydrochloric acid is added to sodium hydroxide solution to form sodium chloride and water.

Q.

A green-colored hydrated metallic salt on heating loses its water of crystallization molecules and gives a suffocating smell. Identify the salt and write the chemical reaction.

Q.

Define exothermic and endothermic reactions. Give two examples of each.

Q.

When ammonium chloride is dissolved in water the solution becomes colder. The change is

Q.

What is sorption give an example?

Q.

A reaction in which heat is released along with the formation of products is called a/an ___ reaction.

1. endothermic

2. neutralisation

3. exothermic

4. decomposition

Q.

What are the demerits of the chemical equation?

Q. When methane undergoes complete combustion, the products formed are:

1. Carbon Dioxide and Hydrogen
2. Oxygen and Hydrogen
3. Nitrogen and Oxygen
4. Carbon Dioxide and Water

Q. Why does respiration considered as an exothermic reaction? Explain.

Q.

The electrolytic decomposition of water gives ${\mathrm{H}}_2\mathrm{and}{\mathrm{O}}_2$ in the ratio of?

1. $1:2$ by volume

2. $2:1$ by volume

3. $8:1$ by mass

4. $1:2$ by mass

Q.

Substances that are formed as a result of a chemical reaction are called ________ and are written on the ________ side of the equation.

1. reactants, left hand

2. products, right hand

3. reactants, right hand

4. products, left hand

Q. A substance added to food containing fats and oils to retain its taste and flavour is called:

Q.

Formation of Nitric Oxide is an___ reaction.

Q. Burning of coal and photosynthesis are examples of and reactions respectively.

1. exothermic
2. endothermic
3. double displacement
4. displacement

Q. What will happen if heat is provided to pure oxygen?

Q.

The decomposition of vegetable matter into compost is an example of _____.

1. Endothermic

2. Exothermic

3. Displacement

4. Redox

Q.

How do you know if a Reaction Absorbs or Release Energy?

Q.

State the effect of :

(a) an endothermic reaction.

(b) an exothermic reaction on the surroun dings.

Q. Which of the following is an endothermic process?

1. Reaction of water with quicklime
2. Dilution of an acid
3. Neutralisation of an acid using base
4. Sublimation of camphor crystals

Q. The decomposition of vegetable into compost is an example of __________ reaction.

1. endothermic
2. displacement
3. None of these
4. exothermic

Q.

The digestion of food is an example of ________ reaction.

Q. Why is photosynthesis considered an endothermic reaction?

Q.

• when ignited in air Magnesium burns with a dazzling __________ flame. (White/ Yellow)

Q.

Which statement is correct about the following reaction?
ZnO + CO → Zn + $C{O}_2$

1. ZnO is being oxidised.

2. ZnO is being reduced.

3. CO₂ is being oxidised.

4. CO is being reduced.

Q. The law of conservation of mass is valid for which of the following?
(a) Reactions involving oxidation.
(b) Nuclear reactions.
(c) Endothermic reactions.

1. a and c
2. a and b
3. b and c
4. b only

Q. Assertion :Respiration is an exothermic process Reason: $C{H}_4+2O_2\to C{O}_2+2H_{2}O,$ is an endothermic process

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

What are the products obtained when we bring about thermal decomposition of $CaC{O}_3$?

1. None of the choices

2. $CaO$ and $H_{2}O$

3. $C{O}_2$ and $CaO$

4. $C{O}_2$ and $Ca$

Q.

Which gas is liberated in the above reaction?

1. Chlorine

2. Hydrogen

3. Oxygen

4. Nitrogen

Q. How will you indicate the following effects in a chemical equation?