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JEE Advanced Mix Test 17

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JEE Advanced Mix Test 17
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Mark the correct options.

    Solution

    K x-ray is emitted when electron jumps from outer shell to K shell. This is equivalent to hole jumping from K shell
    to outer shell. λK < λL

  • Question 2
    4 / -1

    An electron makes a transition from n = 2 to n = 1 state in a hydrogen like atom.

    Solution

  • Question 3
    4 / -1

    Statement–2 : In α decay the mass number decreases by 4 unit and atomic number decreases by 2 unit. In β decay (negative β) the mass number remains unchanged and atomic number increases by 1 unit.

    In γ decay, mass number and atomic number remains unchanged.

    Solution

    Statement-2 is true by definition and correctly explains the staement-1, namely, undergoes 2 α decays, 2β decays (negative β) and 2 γ decays. As a result the daughter product is 

  • Question 4
    4 / -1

    Statement–1 : In the duration electron jumps from first excited state to ground state in a stationary isolated hydrogen atom, angular momentum of the electron about the nucleus is conserved.

    Statement–2 : As the electron jumps from first excited state to ground state, in a hydrogen atom, the electrostatic force on electron is always directed towards the nucleus.

    Solution

    As electron jumps from n = 2 to n = 1, angular momentum  does not remain conserved.

    Hence statement-1 is false.

  • Question 5
    4 / -1

    In column-I, consider each process just before and just after it occurs. Initial system is isolated from all other bodies. Consider all product particles (even those having rest mass zero) in the system. Match the system in column-I with the result they produce in column-II.

    Solution

    (A) In the given spontaneous radioactive decay, the number of protons remain constant and all conservation principles are obeyed.

    (B) In fusion reaction of two hydrogen nuclei, a proton is decreased as positron shall be emitted in the reaction. All the three conservation principles are obeyed.

    (C) In the given fission reaction the number of protons remain constant and all conservation principles are obeyed.

    (D) In beta negative decay, a neutron is converted into a proton and the electron is ejected out.

  • Question 6
    4 / -1

    Which of the following statement is correct with respect to the metal carbonyls of Ist transition series?

    Solution

    Order of C–O bond strength; [Mn(CO)6]+ > [Cr(CO)6] > [V(CO)6]- > [Ti(CO)6]2- and [Ni(CO)4] > [Co(CO)4]- > [Fe(CO)4]2-

    (A) True statement.

    (B) As + ve charge on the central metal atom increases, the less readily the metal can donate electron density into
    the π* orbitals of CO ligand to weaken the C–O bond.

    (C) In the carbonylate anions, the metal has a greater electron density to be dispersed, with the result that M–Cπ
    bonding is enhanced and the C–O bond is diminished in strength.

  • Question 7
    4 / -1

    Solution

  • Question 8
    4 / -1

    When CS2 layer containing both Br2 and I2 (2 : 1) is shaken with excess of Cl2 water, the violet colour due to I2 disappears and a pale yellow colour appears in the solution. The disappearance of violet colour and appearance of pale yellow colour is due to the formation of :

    Solution

  • Question 9
    4 / -1

    The following flow diagram represents the extraction of magnesium from sea water.

    Which of the following options describes the correct reactants, products and reaction conditions ?

    Solution

  • Question 10
    4 / -1

    Concentrated sulphuric acid is added followed by heating of each of the following test tubes labelled (i) to (v).

    Which of the following statement is incorrect about these observations ?

    Solution

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