Chemical Reactions And Equations... I

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  • 1/10 Questions

    When metal reacts with Acid _______ is evolved 

    • Hydrogen gas
    • Nitrogen gas
    • Black precipitate 
    • Yellow precipitate 
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About This Quiz

Explore key concepts in chemistry with the 'Chemical Reactions And Equations. . . I' quiz. This quiz assesses understanding of reaction outcomes, such as precipitate formation, flame characteristics, gas evolution, and reaction products, reinforcing the law of conservation of mass.

Chemical Reactions And Equations... I - Quiz

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  • 2. 

    When Magnesium burns in air ________ is formed. 

    • Dazzling white flame

    • Dazzling yellow flame 

    • Emarald green flame 

    • Bluish green flame

    Correct Answer
    A. Dazzling white flame
    Explanation
    When magnesium burns in air, it reacts with oxygen to form magnesium oxide. During this reaction, a bright and intense white flame is produced. This is because the energy released during the reaction excites the electrons in the magnesium atoms, causing them to emit light in the visible spectrum, which appears as a dazzling white flame.

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  • 3. 

    Fe + CuSO4 - > ______. 

    • FeSO4 + Cu

    • No reaction 

    • CuO + FeS

    • CuSo4 + FeSO4 

    Correct Answer
    A. FeSO4 + Cu
    Explanation
    In this reaction, iron (Fe) reacts with copper sulfate (CuSO4) to form iron sulfate (FeSO4) and copper (Cu). This is a single displacement reaction, where the more reactive metal (iron) replaces the less reactive metal (copper) in the compound.

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  • 4. 

    According to law of conservation of mass, Total mass of reactant is equal to _________

    • Total mass of the product

    • Square of the total mass of product

    • Sum of the total mass of the product and carbon's atomic mass

    • Square root of atomic mass of the products

    Correct Answer
    A. Total mass of the product
    Explanation
    According to the law of conservation of mass, the total mass of the reactant is equal to the total mass of the product. This means that during a chemical reaction, the mass of the reactants before the reaction is equal to the mass of the products after the reaction. This law states that matter cannot be created or destroyed in a chemical reaction, only rearranged. Therefore, the total mass of the reactant must be equal to the total mass of the product.

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  • 5. 

    The chemical formula of Ammonium hydroxide is ______. 

    • NH4 OH

    • NH3OH

    • NaOH

    • NaHCO3

    Correct Answer
    A. NH4 OH
    Explanation
    The correct answer is NH4 OH. Ammonium hydroxide is a compound made up of ammonium (NH4+) and hydroxide (OH-) ions. The chemical formula NH4 OH represents the combination of these ions. The other options, NH3OH, NaOH, and NaHCO3, do not represent the correct formula for ammonium hydroxide.

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  • 6. 

    A short-hand method of representing a chemical reaction is called a _____. 

    • Chemical equation 

    • Balanced equation 

    • Skeletal equation

    • Linear equation 

    Correct Answer
    A. Chemical equation 
    Explanation
    A chemical equation is a short-hand method of representing a chemical reaction. It consists of reactants on the left side, separated by a plus sign, and products on the right side, separated by an arrow. The equation also includes coefficients to represent the number of molecules or moles involved in the reaction. This notation allows chemists to easily understand and communicate the details of a chemical reaction. Balanced equation and skeletal equation are also types of chemical equations, but the term "chemical equation" is a more general term that encompasses all types of equations used to represent chemical reactions.

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  • 7. 

    When aqueous solutions of Barium chloride and Sodium sulphate react together, ________ is formed.... 

    • A white precipitate 

    • Yellow gas

    • A black precipitate

    • Greenish blue gas

    Correct Answer
    A. A white precipitate 
    Explanation
    When aqueous solutions of Barium chloride and Sodium sulphate react together, a white precipitate is formed. This is because Barium chloride and Sodium sulphate react to form Barium sulphate, which is insoluble in water and appears as a white solid precipitate.

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  • 8. 

    The valency of Carbon is ____..

    • 4

    • 6

    • 8

    • 2

    Correct Answer
    A. 4
    Explanation
    Carbon has an atomic number of 6, which means it has 6 electrons. In its ground state, carbon has 2 electrons in its innermost shell and 4 electrons in its outermost shell. The valency of an element is determined by the number of electrons it needs to gain, lose, or share to achieve a stable electron configuration. Since carbon has 4 electrons in its outermost shell, it needs to gain, lose, or share 4 electrons to achieve stability. Therefore, the valency of carbon is 4.

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  • 9. 

    Is magnesium Oxide basic, acidic or neutral?

    • Basic

    • Acidic

    • Neutral 

    • Shows both acidic and basic character

    Correct Answer
    A. Basic
    Explanation
    Magnesium oxide is a basic compound. It is formed by the reaction of magnesium with oxygen. When dissolved in water, it forms magnesium hydroxide, which is a strong base. This compound can also neutralize acids, indicating its basic nature. Therefore, the correct answer is basic.

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  • 10. 

    Calcium Oxide is also called _______ and Calcium hydroxide is also known as _______. 

    • Quick lime, Slaked lime

    • Slaked lime, Quick lime

    • Soda lime, Ginger lime

    • Lime water, Soda ash

    Correct Answer
    A. Quick lime, Slaked lime
    Explanation
    Calcium Oxide is commonly known as Quick lime, while Calcium hydroxide is referred to as Slaked lime.

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  • Current Version
  • Feb 23, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 11, 2020
    Quiz Created by
    Leenasajithnr
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