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JEE Main Test 142
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JEE Main Test 142
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  • Question 1/10
    4 / -1

    The half-life period of radioactive element is 140 days. After 560 days, 1 g of element will reduce to

    Solutions

     

  • Question 2/10
    4 / -1

    Correct order of decreasing thermal stabililty is as

    Solutions

     

  • Question 3/10
    4 / -1

    When dil. H2 SO4 is added to aqueous solution of potassium chromate, yellow colour of solution turns to orange colour. It indicates

    Solutions

    When dil. H2SO4 is added to aqueous solution of K2CrO4, yellow color of solution turns to orange colour (i.e. K2Cr2O7). So if the solution turned from yellow, to orange, the equilibrium was shifted to the right, if the solution turned yellow, the equilibrium was shifted to the left.

    Hence it indicates that monocentric complex is converted into dicentric complex.

     

  • Question 4/10
    4 / -1

    Which requires catalyst ?

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  • Question 5/10
    4 / -1

    Which of the following system is most stable for a chelate ?

    Solutions

    Chelates are more stable than non – chelated compounds of comparable composition and the more extensive the chelation – i.e., the larger the number of ring closures to a metal atom, the more stable the compound.

    Therefore five fused cyclid system is most stable for a chelate.

     

  • Question 6/10
    4 / -1

    The final product, in the below reaction, is

    Solutions

    Bromination of aniline yields tribromo aniline Diacotization of the product followed by treatement with trifluoro – hydrido – boron removes amine group.

     

  • Question 7/10
    4 / -1

    Reduction of nitrobenzene in the presence of Zn /NH4 Cl gives

    Solutions

    Zinc dust and ammonium chloride convert nitro benzene to the corresponding hydroxylamine

     

  • Question 8/10
    4 / -1

    Secondary nitro alkanes can be converted into ketones by using Y. Identify Y from the following.

  • Question 9/10
    4 / -1

    OB and OC are two roads enclosing an angle of 120°. X and Y start from 0 at the same time. X travels along OB with a speed of 4 km/h and Y travels along OC with a speed of 3 km/h. The rate at which the shortest distance between X and Y is increasing after 1 h is

    Solutions

     

  • Question 10/10
    4 / -1

    Solutions

     

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