Types of Chemical Reactions Additional One Mark Online Test

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

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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.\(\text{CaCl}_2\)

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\(\text{KI}_{(aq)} + \text{Br}_{2(g)} \rightarrow 2\text{KBr}_{(aq)} + \text{I}_{2(g)}\)

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)

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

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

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

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

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

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

Q10

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

Q11

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

Q12

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

Q13

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

Q14

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

Q15

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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