Chemistry - Metals and Non-metals

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61. Magnesium ribbon is rubbed with sand paper before making it to burn. The reason of rubbing the ribbon is to (NTSE Stage-II, 2015-16)

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62. The element that cannot be used as a reducing agent is (NTSE Stage-II, 2015-16)

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63. Which statement is correct in the following?

  • Option : A
  • Explanation : All metals are tensile. The term tensile strength refers to the amount of tensile (stretching) stress a material can withstand before breaking or failing. The ultimate tensile strength of a material is calculated by dividing the area of the material tested (the cross-section) by the stress placed on the material, generally expressed in terms of pounds or tons per square inch of material.
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