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Chemical Reactions and Equations Test - 9

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Chemical Reactions and Equations Test - 9
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Weekly Quiz Competition
  • Question 1
    1 / -0

    PbI2 is

    Solution

    PbI2 is not a purely ionic compound, but it is covalent. So, the colorless ions I(-) and Pb(2+) combine into a completely new entity, PbI2. That entity is yellow in color.

  • Question 2
    1 / -0

    The element or compound which undergoes reduction is

    Solution

    An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Examples of oxidizing agents include halogens, potassium nitrate, and nitric acid. 

  • Question 3
    1 / -0

    Which of the following is not an example of chemical change?

    Solution

    Water vapour can again be converted to water so it is a physical change 

  • Question 4
    1 / -0

    Which is the formula of magnesium nitride

    Solution

    Valency of Mg 2 and nitrogen 3 so formula Mg3 N2

  • Question 5
    1 / -0

    What happens when Hydrogen combines with oxygen in the presence of an electric current?

    Solution

    Hydrogen and Oxygen gives water 

  • Question 6
    1 / -0

    Mg ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, Magnesium oxide. Magnesium is

    Solution

    Mg combines with O2 to form MgO so oxidized 

  • Question 7
    1 / -0

    The reactions in which more reactive element can displace less reactive element from a compound are called

    Solution

    One element which is higher in the reactivity series displaces the one which is lower from its compound is called displacement reaction 

  • Question 8
    1 / -0

    Decomposition of ferrous sulphate into Fe2O3, SO2 and SO3 occurs in the presence of

    Solution

    Ferrous sulphate is blue green in colour

    On being heated it loses water of crystallization and forms anhydrous ferrous sulphate . On further heating it decomposes to ferric oxide , sulphur dioxide and sulphur trioxide . It is an example of thermal decomposition 

  • Question 9
    1 / -0

    The compound formed by  Hg+2 and Cl- is

    Solution

    2 Cl{-} + Hg2{2+} = Hg2Cl2

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