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Materials Metals and Non Metals Test - 18

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Materials Metals and Non Metals Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which metal is stored in kerosene oil?
    Solution
    Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
  • Question 2
    1 / -0
    Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured. The non-metal which is known to form the largest number of compounds is:
    Solution
    Carbon is a non-metal and is  known to form the largest number of compounds due to two reasons:

    1. Catenation - The ability of carbon to form bonds with the atoms of itself resulting in the large chains and rings of carbon. It causes a large no. of chain and ring compounds.
    2. Tetravalency - Due to tetravalency, carbon can form bonds with other tetravalent elements and monovalent elements like hydrogen, chlorine, bromine etc.

    Hence, option A is correct.
  • Question 3
    1 / -0
    Which of the following non-metals react and catches fire on exposure to air?
    Solution
    Phosphorus is a very reactive non-metal. It catches fire if exposed to air.

    Option A is correct.
  • Question 4
    1 / -0
    Which one of the following nutrient is not available in fertilizers?
    Solution
    Potassium, Nitrogen, and Phosphorous are normally derived from the soil in the form of inorganic salts and are nutrients available in fertilizers that make up 0.5 to 6.0 percent. Hence iron is a nutrient that is not available in fertilizers.
  • Question 5
    1 / -0
    Materials which can be drawn into wires are called ductile. Which of the following is not used as a ductile material?
    Solution
    Silver is a soft metal with high thermal and electrical conductivity. It is malleable and ductile similar to gold. However, silver content in ores mines in India is about 1% obtained as a by-product in the mining of gold and lead. Thus, silver is highly expensive to be drawn into wires for the industries.
  • Question 6
    1 / -0
    Calcium phosphate is present in tooth enamel. Its nature is __________.
    Solution
    Tooth enamel is one of the four major tissues that make up the tooth in humans and many other animals. It makes up the visible part of the tooth covering the crown. The other major tissues are dentin, cementum and dental pulp. It protects the teeth but can be easily decayed and destroyed. It is the hardest substance in the human body and contains the highest percentage of minerals 96% . This mineral is hydroxyapetite which is crystalline calcium phosphate. In humans enamel varies in thickness over the surface of the tooth thickest at the cusps and thinnest at the border.
    $${ Ca }_{ 10 }{ (PO }_{ 4 })_{ 6 }{ (OH) }_{ 2 }\left( s \right) +8{ H }^{ + }\left( aq \right) \rightarrow 10{ Ca }^{ 2+ }\left( aq \right) +6{ HPO }_{ 4 }^{ 2- }\left( aq \right) +2{ H }_{ 2 }O\left( l \right)$$
  • Question 7
    1 / -0
    Which of the following is used for dissolution of gold?
    Solution
    Aqua regia is a chemical solution that is obtained by mixing three parts nitric acid and one part hydrochloric acid. It can dissolve gold, platinum, titanium, and other noble metals.
  • Question 8
    1 / -0
    Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?
    Solution
    Lustre means to shine. Shining metals are also called lustrous metal. For example, gold. Non-metals such as sulphur, oxygen, nitrogen are non-lustrous but iodine is a greyish black solid and its crystals have a metallic lustre.
  • Question 9
    1 / -0
    Metal that exists in the liquid state at room temperature is :
    Solution
    Mercury is a metal which is liquid at room temperature.
  • Question 10
    1 / -0
    An element $$A$$ is soft and can be cut with a knife. This is very reactive with air and cannot be kept open in the air. It reacts vigorously with water. The element $$A$$ is:
    Solution
    Sodium is so soft that it can be cut with a knife. It reacts vigorously with oxygen when kept open in the air and hence, we keep it immersed in kerosene oil. It also reacts vigorously with water.
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