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Chemistry Test ...

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  • Question 1
    4 / -1

    What is the energy (in J atom-1) required for the process Be3+(g) → Be4+(g) + e-?

  • Question 2
    4 / -1

    Given below are two statements:

    Statement I: The correct sequence of bond order in the following species is: NO+ > NO > NO-

    Statement II: The correct sequence of the number of unpaired electrons in the following species is: NO- > NO > NO+

    In the light of the above statements, choose the correct answer from the options given below:

  • Question 3
    4 / -1

    Directions For Questions

    Consider the following data:

    (i) 2Fe(s) + 6HCl(aq) → 2FeCl3(aq) + 3H2(g), ΔH1 = –800 kJ/mol

    (ii) H2(g) + Cl2(g) → 2HCl(g), ΔH2 = –184 kJ/mol

    (iii) HCl(g) + aq → HCl(aq), ΔH3 = –75 kJ/mol

    (iv) FeCl3(s) + aq → FeCl3(aq), ΔH4 = –150 kJ/mol

    ...view full instructions

    The enthalpy of formation of anhydrous solid FeCl3 (per mole) is:

  • Question 4
    4 / -1

    9.0 g of a monobasic organic acid (molar mass = 90 g mol-1) is dissolved in 500 g of water at 298 K. The depression in freezing point of water was 0.39°C. What is Ka of the acid? (For water, Kf = 1.86 K kg mol-1. Assume molarity and molality to have the same values.)

  • Question 5
    4 / -1

    The solubility product constants of PbCl2 and AgI are 4x and y respectively at 298 K. The value of (molarity of PbCl2 / molarity of AgI) can be expressed as:

  • Question 6
    4 / -1

    An electrochemical cell is constructed using half cells (in the direction of spontaneous change):

    Zn(OH)2(s) + 2e- → Zn(s) + 2OH-(aq), E° = –1.25 V

    Hg2Cl2(s) + 2e- → 2Hg(l) + 2Cl-(aq), E° = +0.27 V

    Which of the following options is correct?

  • Question 7
    4 / -1

    t1/2 is the time required for 50% completion of a reaction, and t3/4 is the time required for 75% completion. Which of the following correctly represents the relation between t3/4 and t1/2 for zero order and second order reactions respectively?

  • Question 8
    4 / -1

    Given below are two statements:

    Statement I: The first ionisation enthalpy of the elements B, C, N and O follows the order B < C < O < N.

    Statement II: Among Na, Mg, Al and Si, the second ionisation enthalpy is highest for Na.

    In the light of the above statements, choose the correct answer from the options given below:

  • Question 9
    4 / -1

    Given below are two statements:

    Statement I: ClF3 has a T-shaped molecular geometry due to the presence of 2 lone pairs on the central Cl atom.

    Statement II: BrF5 has a square pyramidal geometry due to the presence of 1 lone pair on the central Br atom.

    In the light of the above statements, choose the correct answer from the options given below:

  • Question 10
    4 / -1

    Which of the following sets includes all the species that will change the orange colour of K2Cr2O7 in acidic medium?

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