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JEE Main Test 133

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JEE Main Test 133
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Weekly Quiz Competition
  • Question 1
    4 / -1

    A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room ?

    Solution

     

  • Question 2
    4 / -1

    Which of the following statements regarding sulphur is incorrect ?

    Solution

     

  • Question 3
    4 / -1

    Formation of coloured ions by transition metals signifies

    Solution

    Coloured compounds of transition elements is associated with partially filled (n - 1)d orbitals. The transition undergoes electronic unpaired d – electrons undergoes electronic transition from one – d – orbitial to another. During this d – d transition process the electrons absorb certain process the electrons absorb certain energy from the radiation and emit the remainder of energy as colored light. The color of ion is complementary of color absorbedby it. Hence colored ion is formed due to d – d transition which falls in visible region for all transition elements.

     

     

  • Question 4
    4 / -1

    The correct structure of ethylenediaminetetraacetic acid (EDTA) is

    Solution

     

  • Question 5
    4 / -1

    Reaction of alkyl halides with aromatic compounds in presence of anhy. AlCl3 is known as

    Solution

     

  • Question 6
    4 / -1

    A man of 2 m height walks at a uniform speed of 6 km/h, away from a lamp post of 6 m height. The rate at which the length of his shadow increase is

    Solution

     

  • Question 7
    4 / -1

    Gabriel's synthesis is used frequently for the preparation of which of the following?

    Solution

    The gabriel synthesis is a chemical reaction that transforms primary alkyl halides into primary amines. Traditionally the reaction uses potassium phthalimide.

     

  • Question 8
    4 / -1

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  • Question 9
    4 / -1

    Identify the correct product formed during the following reaction

    Solution

     

  • Question 10
    4 / -1

    Phenol is heated with a solution of mixture of KBr and KBrO3 .The major product obtained in the above reaction is

    Solution

     

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