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Test: Chemical Reactions and Equations - SSC CGL MCQ


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15 Questions MCQ Test General Awareness for SSC CGL - Test: Chemical Reactions and Equations

Test: Chemical Reactions and Equations for SSC CGL 2024 is part of General Awareness for SSC CGL preparation. The Test: Chemical Reactions and Equations questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Chemical Reactions and Equations MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Reactions and Equations below.
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Test: Chemical Reactions and Equations - Question 1

What type of change involves alterations in physical properties like color, density, and melting point without affecting the chemical composition of matter?

Detailed Solution for Test: Chemical Reactions and Equations - Question 1

Physical changes are alterations that affect the physical properties of a substance without changing its chemical composition. An interesting fact is that physical changes can often be observed through changes in state, such as melting ice or boiling water, where the substance transitions between solid, liquid, and gas states without forming new substances.

Test: Chemical Reactions and Equations - Question 2

Which process results in the formation of a new substance by altering both the composition and chemical properties of matter?

Detailed Solution for Test: Chemical Reactions and Equations - Question 2

Chemical changes involve transformations that lead to the creation of new substances with different chemical properties. For instance, when wood burns to produce ash and gases, or when iron rusts, there is a chemical change occurring. These alterations are typically irreversible and result in the formation of distinct substances.

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Test: Chemical Reactions and Equations - Question 3

Which of the following is an example of a chemical change?

Detailed Solution for Test: Chemical Reactions and Equations - Question 3

The ripening of fruits is a classic example of a chemical change. During this process, enzymes within the fruit catalyze reactions that break down complex molecules into simpler ones, leading to changes in color, texture, and taste. This transformation is irreversible and results in the formation of new substances within the fruit.

Test: Chemical Reactions and Equations - Question 4

What is a key characteristic of a chemical reaction?

Detailed Solution for Test: Chemical Reactions and Equations - Question 4

A key characteristic of a chemical reaction is a change in state. When substances react to produce new substances, observable changes such as a change in state, color, evolution of a gas, or change in temperature can indicate that a chemical reaction has occurred. This transformation is a fundamental aspect of chemical reactions and is often used to identify when a chemical change has taken place.

Test: Chemical Reactions and Equations - Question 5

Which of the following is NOT a common observation indicating a chemical reaction?

Detailed Solution for Test: Chemical Reactions and Equations - Question 5

Among the given options, a change in volume is not a common observation indicating a chemical reaction. While changes in color, evolution of gas, and changes in temperature are typical indicators of chemical reactions, changes in volume are not universally associated with chemical reactions, making it the correct choice in this context.

Test: Chemical Reactions and Equations - Question 6

What is one common outcome of a chemical reaction involving magnesium ribbon?

Detailed Solution for Test: Chemical Reactions and Equations - Question 6

When magnesium ribbon undergoes a chemical reaction, it often results in the formation of a white powder known as magnesium oxide. This process typically involves the magnesium ribbon burning with a dazzling white flame, ultimately transforming into the white powder. The production of this white powder is a characteristic outcome of the chemical reaction involving magnesium ribbon.

Test: Chemical Reactions and Equations - Question 7

What type of reaction is exemplified by the combination of calcium oxide and water to produce slaked lime with the release of a large amount of energy?

Detailed Solution for Test: Chemical Reactions and Equations - Question 7

The reaction between calcium oxide and water resulting in the production of slaked lime with the release of a large amount of energy is a classic example of a combination reaction. In a combination reaction, two or more substances combine to form a single product.

Test: Chemical Reactions and Equations - Question 8

Which type of reaction involves a single compound breaking down into two or more simpler substances, often requiring energy in the form of heat, light, or electricity?

Detailed Solution for Test: Chemical Reactions and Equations - Question 8

Decomposition reactions involve a single compound breaking down into simpler substances. These reactions often require an external source of energy such as heat, light, or electricity to facilitate the breakdown process.

Test: Chemical Reactions and Equations - Question 9

In a displacement reaction, what typically occurs when a more reactive substance replaces a less reactive one in a solution?

Detailed Solution for Test: Chemical Reactions and Equations - Question 9

Displacement reactions involve the exchange of ions between reacting substances, leading to the formation of new compounds. In scenarios where a more reactive substance replaces a less reactive one in a solution, it often results in the formation of a precipitate, which is a solid that forms and does not dissolve in the solvent.

Test: Chemical Reactions and Equations - Question 10

What is the primary role of electrons in oxidation reactions?

Detailed Solution for Test: Chemical Reactions and Equations - Question 10

In oxidation reactions, such as when magnesium changes into magnesium 2 ion, electrons are lost. This loss of electrons is a key characteristic of oxidation. Electrons are crucial in defining oxidation, where the substance that is oxidized loses electrons.

Test: Chemical Reactions and Equations - Question 11

What type of change involves alterations in physical properties like color, density, and hardness without affecting the chemical composition of matter?

Detailed Solution for Test: Chemical Reactions and Equations - Question 11

Physical change refers to alterations in physical properties such as color, density, hardness, and state of matter without affecting the chemical composition of the substance. An example of a physical change is melting ice, where the solid form changes to liquid without altering the chemical structure of water. This type of change can typically be reversed by adjusting temperature and pressure, making it distinct from chemical changes where new substances are formed.

Test: Chemical Reactions and Equations - Question 12

What are some observable indications that a chemical reaction has occurred?

Detailed Solution for Test: Chemical Reactions and Equations - Question 12

The evolution of a gas is one of the observable indications that a chemical reaction has taken place. When certain substances react chemically, they may release gases as a byproduct. This gas evolution can signify that new substances have been formed through the rearrangement of atoms and bonds. In chemical reactions, the formation of gases can be a crucial clue to understanding the transformation of substances at the molecular level.

Test: Chemical Reactions and Equations - Question 13

What is the role of electrons in oxidation ?

Detailed Solution for Test: Chemical Reactions and Equations - Question 13

In oxidation reactions, electrons are lost. This is exemplified when a substance like magnesium changes into a magnesium 2 ion and loses two electrons. This loss of electrons is a key characteristic of oxidation reactions, where the substance undergoing oxidation loses electrons.

Test: Chemical Reactions and Equations - Question 14

What distinguishes a physical change from a chemical change in terms of reversibility?

Detailed Solution for Test: Chemical Reactions and Equations - Question 14

One key distinction between physical and chemical changes lies in their reversibility. Physical changes, such as melting ice or dissolving sugar in water, can typically be reversed by altering temperature or pressure. In contrast, chemical changes, like burning wood or rusting iron, are usually irreversible, as they involve the formation of new substances with different chemical properties.

Test: Chemical Reactions and Equations - Question 15

How can a chemical reaction be visually confirmed?

Detailed Solution for Test: Chemical Reactions and Equations - Question 15

A chemical reaction can be visually confirmed through the formation of a new substance. When substances react to produce entirely different substances with distinct properties, it serves as a clear indication that a chemical reaction has occurred. This transformation involves bond breaking or formation between atoms, leading to the creation of new compounds or elements, highlighting the essence of a chemical reaction.

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