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Chemistry Test 19
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Chemistry Test 19
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  • Question 1/10
    1 / -0
    During which type of chemical reaction, heat is absorbed?
    Solutions
    Chemical reactions are generally accompanied by heat changes.
    • A reaction in which heat is evolved is called exothermic chemical reaction.
    • A reaction in which heat is absorbed is called endothermic chemical reaction.
  • Question 2/10
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    Which fibre is used in making bristles for a toothbrush?
    Solutions
    Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name. It is used in making bristles for brushes, synthetic fibres, and parachutes etc.
  • Question 3/10
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    Which of the following compounds is an example of an aromatic hydrocarbon?
    Solutions
    Toluene is an example of an aromatic hydrocarbon.
    An aromatic hydrocarbon is a hydrocarbon with sigma bonds and delocalized pi electrons between carbon atoms forming a circle.
  • Question 4/10
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    Which of the following element of halogen family does not exist in the earth’s crust?
    Solutions
    All the halogen elements except astatine exist in theearth’s crust.
    The halogen family consists of the elements fluorine, F; chlorine, Cl; bromine, Br; iodine, I; and astatine, At.
  • Question 5/10
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    ‘Laughing Gas’ is the common name of which chemical compound?
    Solutions
    • Nitrous oxide commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N2O.
    • At room temperature, it is a colourless non-flammable gas, with a slight metallic scent and taste.
  • Question 6/10
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    Ozone is a ______ of oxygen?
    Solutions
    • Ozone is an allotrope of oxygen, where allotrope means different forms of the same element for example carbon has got two allotrope in the form of diamond and graphite. Other type of oxygen allotrope are dioxygen and tetra oxygen.
  • Question 7/10
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    Which acid is used in  batteries?
    Solutions
    Sulfuric acid is used in  batteries. Each cell of a lead storage battery consists of alternate plates of lead (cathode) and lead coated with lead dioxide (anode) immersed in an electrolyte of the sulfuric acid solution.
  • Question 8/10
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    PET is a very familiar form of _____________. It is used for making bottles.
    Solutions
    PET is a very familiar form of Polyester. It is used for making bottles, utensils,films, wire. Polyesters are polymers formed from a dicarboxylic acid and a diol. Their most familiar applications are in clothing, food packaging and plastic water and carbonated soft drink bottles.
  • Question 9/10
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    Which acid is found in apples?
    Solutions
    The acid found in apples is known as malic acid. Malic acid, which is a dicarboxylic acid, is also found in wine, rhubarb and grapes. It is used as a flavouring agent to impart a tart taste to foods.
  • Question 10/10
    1 / -0
    Which of the following is not a chemical reaction?
    Solutions
    Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed, the chemical composition is not altered.Physical changes can often be reversed. Allowing the water to evaporate will return the salt to a solid state.
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