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Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations


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Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 1

H2SO4 + 2NaOH → Na2SO4 + 2H2O
Above equation is a:

(i) neutralization reaction

(ii) double displacement reaction

(iii) decomposition reaction

(iv) addition reaction

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 1
  • neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form salt and water as products. In a neutralization reaction, there is a combination of H+ ions and OH ions that form water.
  • A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Double displacement reactions typically result in the formation of a product that is a precipitate. 
    Double displacement reactions take the form: AB + CD → AD + CB

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 2

Identify the following reactions as endothermic or exothermic,

(i) 2NaHCO3 + energy → Na2CO3 + H2O + CO2

(ii) 2Mg + O2 → 2MgO + energy

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 2
  • Reaction with the absorption of energy is called an endothermic reaction.
    In reaction (i) Sodium Bicarbonate needs the energy to form sodium carbonate, water and carbon dioxide. 
    Hence it is an endothermic reaction.
  • Reaction with the release of energy is called an exothermic reaction.
    In the reaction (ii) on the burning of magnesium wire, magnesium oxide is formed by the release of energy in the form of heat and light.
    Hence it is an exothermic reaction.

 

 

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 3

Correct balanced equation from the following reactions is:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 3 On balancing the atoms of all the elements, we will get the following chemical equation-

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 4

In a double displacement reaction?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 4 Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 5

The reaction, 3MnO2(s) + 4AI(s) → 3Mn(l) + 2Al2O5(s) + Heat is an example of:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 5 3MnO2(s) + 4AI(s) → 3Mn(l) + 2Al2O5(s)

Aluminium being more reactive displaces the manganese metal and forms a new compound. Hence it is a displacement reaction.

The heat is also released along with the formation of products, hence it is an exothermic reaction.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 6

The reaction Pb(NO3)2 + 2NaI → 2NaNO3 + PbI2 ↓ is classified as

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 6 In this reaction, two new substances lead iodide, and sodium nitrate are formed by an interchange of radicals in lead nitrate and sodium iodide.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 7

Which of the statements about the reaction below are incorrect?
2PbO(s) + C(s) → 2Pb(s) + CO2 (g)

(i) Lead is getting reduced.
(ii) Carbon dioxide is getting oxidised.
(iii) Carbon is getting oxidised.
(iv) Lead oxide is getting reduced.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 7

In the above reaction, lead oxide is getting converted to lead and carbon is getting converted to carbon dioxide. Lead oxide is losing oxygen whereas carbon is gaining oxygen. Loss of oxygen is known as reduction while gaining oxygen is called oxidation. Hence, Lead oxide is getting reduced and carbon is getting reduced. Thus statements (iii) and (iv) are correct whereas statements (i) and (ii) are incorrect.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 8

Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 8

In the given reaction, Ferric oxide is getting converted to Iron while aluminium is getting oxidized to aluminium oxide. Thus, iron is going from a combined state to a free state whereas aluminium is going from a free state to the combined state. Such a reaction is called displacement reaction as in displacement reactions, the more reactive metal (Al in this case) displaces the less reactive metal (Fe in this case) from its compound.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 9

What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.​

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 9

When metals react with acids, H2 gas is evolved along with the formation of the respective salt of metal.
Fe(s) + 2HCl(aq) → FeCl2(s) + H2(g) ↑

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 10

Two different atoms or groups of atoms (ions) are exchanged in ______ reactions.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 10 A double displacement reaction is a reaction where part of one reactant is replaced by part of another reactant. AB + CD → AD + CB

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 11

When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen.

2Pb(NO3)2 → 2PbO + 4NO2 + O2

The reaction is an example of:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 11

A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. The general form of a decomposition reaction is AB→A+B. Most decomposition reactions require an input of energy in the form of heat, light, or electricity.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 12

Thermal decomposition of a substance is brought about with the help of

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 12 Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 13

Aluminium can displace Zinc metal from the aqueous solution of zinc sulphate because of ______.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 13 In the displacement series of metals for displacement reactions, aluminium is above the zinc metal signifying that aluminium is more reactive than zinc. Therefore, aluminium can displace Zn metal from the aqueous solution of zinc sulphate.

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 14

The reaction Pb(NO3)2 + 2NaI → 2NaNO3 + Pbl2 ↓ is classified as

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 14

In this reaction, two new substances lead iodide, and sodium nitrate are formed by an interchange of radicals in lead nitrate and sodium iodide.

 

 

Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 15

A piece of granulated zinc was dropped into a copper sulphate solution. After some time, the colour of the solution changed from:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Chemical Reactions & Equations - Question 15 When a piece of granulated zinc was dropped into the copper sulphate solution, the colour of the solution changes from blue to colourless as the following reaction takes place

Zn + CuSO4 → ZnSO4 + Cu blue colourless.

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