Types of Chemical Reactions One Mark Online Test

Types of Chemical Reactions One Mark Online Test (10th Standard Science)

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\(\text{H}_{2(g)} + \text{Cl}_{2(g)} \rightarrow 2\text{HCl}_{(g)}\) is a

A.Decomposition Reaction B.Combination Reaction C.Single Displacement Reaction D.Double Displacement Reaction

Photolysis is a decomposition reaction caused by ___________

A.heat B.electricity C.light D.mechanical energy

A reaction between carbon and oxygen is represented by \(\text{C}_{(s)} + \text{O}_{2(g)} \rightarrow \text{CO}_{2(g)} + \text{Heat}\). In which of the type(s), the above reaction can be classified? (i) Combination Reaction (ii) Combustion Reaction (iii) Decomposition Reaction (iv) Irreversible Reaction

A.i and ii B.i and iv C.i, ii and iii D.i, ii and iv

The chemical equation \(\text{Na}_2\text{SO}_{4(aq)} + \text{BaCl}_{2(aq)} \rightarrow \text{BaSO}_{4(s)}\downarrow + 2\text{NaCl}_{(aq)}\) represents which of the following types of reaction?

A.Neutralisation B.Combustion C.Precipitation D.Single displacement

Which of the following statements are correct about a chemical equilibrium? (i) It is dynamic in nature (ii) The rate of the forward and backward reactions are equal at equilibrium (iii) Irreversible reactions do not attain chemical equilibrium (iv) The concentration of reactants and products may be different

A.i, ii and iii B.i, ii and iv C.ii, iii and iv D.i, iii and iv

A single displacement reaction is represented by \(\text{X}_{(s)} + 2\text{HCl}_{(aq)} \rightarrow \text{XCl}_{2(aq)} + \text{H}_{2(g)}\). Which of the following(s) could be \(\text{X}\)? (i) Zn (ii) Ag (iii) Cu (iv) Mg Choose the best pair.

A.i and ii B.ii and iii C.iii and iv D.i and iv

Which of the following is not an "element + element \(\rightarrow\) compound" type reaction?

A.\(\text{C}_{(s)} + \text{O}_{2(g)} \rightarrow \text{CO}_{2(g)}\) B.\(2\text{K}_{(s)} + \text{Br}_{2(l)} \rightarrow 2\text{KBr}_{(s)}\) C.\(2\text{CO}_{(g)} + \text{O}_{2(g)} \rightarrow 2\text{CO}_{2(g)}\) D.\(4\text{Fe}_{(s)} + 3\text{O}_{2(g)} \rightarrow 2\text{Fe}_2\text{O}_{3(s)}\)

Which of the following represents a precipitation reaction?

A.\(\text{A}_{(s)} + \text{B}_{(s)} \rightarrow \text{C}_{(s)} + \text{D}_{(s)}\) B.\(\text{A}_{(s)} + \text{B}_{(aq)} \rightarrow \text{C}_{(aq)} + \text{D}_{(l)}\) C.\(\text{A}_{(aq)} + \text{B}_{(aq)} \rightarrow \text{C}_{(s)} + \text{D}_{(aq)}\) D.\(\text{A}_{(aq)} + \text{B}_{(s)} \rightarrow \text{C}_{(aq)} + \text{D}_{(l)}\)

The pH of a solution is 3. Its \([\text{OH}^-]\) concentration is

A.\(1 \times 10^{-3}\text{ M}\) B.\(3\text{ M}\) C.\(1 \times 10^{-11}\text{ M}\) D.\(11\text{ M}\)

Q10

Powdered \(\text{CaCO}_3\) reacts more rapidly than flaky \(\text{CaCO}_3\) because of ___________.

A.large surface area B.high pressure C.high concentration D.high temperature

Q11

When slaked lime is applied to walls during white washing, it reacts slowly with a gas in the air to form a thin, shiny layer. What is the chemical formula of this shiny layer?

A.\(\text{Ca(OH)}_2\) B.\(\text{CaO}\) C.\(\text{CaCO}_3\) D.\(\text{CaCl}_2\)

Q12

According to the activity of halogens, which of the following single displacement reactions will NOT occur in practice?

A.2\(\text{NaCl}_{(aq)} + \text{F}_{2(g)} \rightarrow 2\text{NaF}_{(aq)} + \text{Cl}_{2(g)}\) B.2\(\text{NaF}_{(aq)} + \text{Cl}_{2(g)} \rightarrow 2\text{NaCl}_{(aq)} + \text{F}_{2(g)}\) C.2\(\text{KBr}_{(aq)} + \text{Cl}_{2(g)} \rightarrow 2\text{KCl}_{(aq)} + \text{Br}_{2(g)}\) D.2\(\text{KI}_{(aq)} + \text{Br}_{2(g)} \rightarrow 2\text{KBr}_{(aq)} + \text{I}_{2(g)}\)

Q13

Based on the activity series of metals, which of the following metals is the most reactive and placed at the top of the series?

A.Sodium (Na) B.Calcium (Ca) C.Potassium (K) D.Magnesium (Mg)

Q14

The reaction between silicon dioxide and calcium oxide to form calcium silicate (\(\text{SiO}_{2(s)} + \text{CaO}_{(s)} \rightarrow \text{CaSiO}_{3(s)}\)) is classified under which type of combination reaction?

A.Element + Element \(\rightarrow\) Compound B.Compound + Element \(\rightarrow\) Compound C.Compound + Compound \(\rightarrow\) Compound D.Element + Compound \(\rightarrow\) Element

Q15

During the thermal decomposition of mercury (II) oxide, which is a thermolysis reaction, the reactant decomposes into:

A.Two simpler compounds B.A compound and an element C.Two elements D.A compound and water

Q16

Granulated zinc reacts faster with \(2\text{ M}\) hydrochloric acid than with \(1\text{ M}\) hydrochloric acid. This rate increase is directly due to the influence of which factor?

A.Nature of reactants B.Surface area of reactants C.Concentration of reactants D.Temperature of reaction mixture

Q17

In the decomposition of potassium chlorate into potassium chloride and oxygen, manganese dioxide (\(\text{MnO}_2\)) is added. What role does manganese dioxide play in this chemical reaction?

A.It acts as a reactant and is completely consumed B.It acts as an endothermic heat absorber C.It acts as a catalyst to increase the reaction rate D.It acts as an inhibitor to prevent the reaction

Q18

Why is chemical equilibrium referred to as a dynamic equilibrium?

A.Because the reaction completely stops at equilibrium B.Because both forward and backward reactions continue to occur at equal rates C.Because the concentration of reactants becomes zero D.Because the pressure of the system continuously fluctuates

Q19

The equilibrium attained during the physical process of melting of ice is known as:

A.Chemical equilibrium B.Dynamic gas equilibrium C.Physical equilibrium D.Static solid equilibrium

Q20

For a general reaction \(\text{A} \rightarrow \text{B}\), the rate of reaction can be represented by which of the following expressions?

A.\(\text{Rate} = +\frac{d[\text{A}]}{dt} = -\frac{d[\text{B}]}{dt}\) B.\(\text{Rate} = -\frac{d[\text{A}]}{dt} = +\frac{d[\text{B}]}{dt}\) C.\(\text{Rate} = -\frac{d[\text{A}]}{dt} = -\frac{d[\text{B}]}{dt}\) D.\(\text{Rate} = +\frac{d[\text{A}]}{dt} = +\frac{d[\text{B}]}{dt}\)

Q21

In the human body, all vital biochemical reactions take place within a narrow, regulated pH range of:

A.7.0 to 7.8 B.5.6 to 6.0 C.8.2 to 9.0 D.1.5 to 3.5

Q22

Rainwater is classified as 'acid rain' when its pH value falls below which threshold?

A.7.0 B.6.5 C.5.6 D.4.0

Q23

What is the pH of a \(1.0 \times 10^{-4}\text{ M}\) solution of nitric acid (\(\text{HNO}_3\))?

A.10 B.4 C.1.4 D.14

Q24

Calculate the pH of a \(1.0 \times 10^{-4}\text{ M}\) solution of sodium hydroxide (\(\text{NaOH}\)).

A.4 B.7 C.10 D.14

Q25

On recharging a mobile phone, the chemical reactions that provide energy during discharging are reversed. This process is a practical application of:

A.Thermal irreversible decomposition B.Reversible reactions under suitable conditions C.Rapid uncontrolled combustion D.Unidirectional double displacement

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This free online practice test covers Types of Chemical Reactions from the 10th Standard Science (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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