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Chemistry Test 131
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Chemistry Test 131
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  • Question 1/10
    4 / -1

    The intermediate formed in the following reaction is-

    Solutions

    The reaction is an example of cine subsitution or elimination addition

     

  • Question 2/10
    4 / -1

    The compound present in brorax bead is

    Solutions

    This test is meant for detecting the coloured cations. When borax is heated on a platinum loop it swells up into a white porous mass first which on subsequent heating melts into a shining transparent glass bead (B2O3).

    When this glass bead is heated with coloured compounds, a characteristic colour of metaborate is formed.

    However, in a reducing flame, a different colour is obtained.

     

  • Question 3/10
    4 / -1

    The correct decreasing order of acidic nature is

    Solutions

    Acidic character depends on stability of conjugate base. More stable conjugate base, more will be the acidic character

    Electronegativity of Cl > Br > I So stability order of conjugate bases CIO- > BrO- > IO- Hence acidic character HCIO > HBrO > HIO

     

  • Question 4/10
    4 / -1

    In  the formal charge on each oxygen atom and P - 0 bond order respectively are

    Solutions

    3 negative charges of the ion is beings h are d by 4 oxygen atoms,
    ∴ formal charge on an O atom = -3/4

     

  • Question 5/10
    4 / -1

    Which one of the following compounds is not aromatic?

    Solutions

    Aromaticity of a compound can be decided by Huckel's rule.
    Huckel's rules are as follows:
    1. Compound must be cyclic
    2. The cyclic compound must have resonance and complete delocalization of electrons i.e., there must be conjugation.
    3. The total number of pi electrons must fit the formula = 4n + 2, where n is a non - negative integer.
    The important summary of this concept is as follows: (Remember this summary)

     

  • Question 6/10
    4 / -1

    The actinoids exhibit more number of oxidation states in general than the lanthanoids because

    Solutions

    shielding effect of 5f < shielding effect of 4f

    so Zeff (z effect) in actinoidis < Zeff (z effect) in lanthanoid

    so extraction of electrons in actinoid is easy than lanthanoid which has 4f and better shielding.

     

  • Question 7/10
    4 / -1

    The compound  when kept in pentane converts to a constitutional isomer. Identify that 
    isomer.

    Solutions

     

  • Question 8/10
    4 / -1

    The vapour pressure of water at 20 °C is 17.5 torr. What will be the no. of moles of water present in one litre of air at 20 °C and 40% relative humidity.(R =0.082 L atm/mol-k)

    Solutions

     

  • Question 9/10
    4 / -1

    0.400 g of impure CaSO4 (Molar mass = 136) solution when treated with excess of barium chloride solution, gave 0.617 g of anhydrous BaSO4 (Molar mass = 233). The percentage of CaSO4 present in the sample is

    Solutions

     

  • Question 10/10
    4 / -1

    At temperature 300 K for reaction  C2H4(g) + 3O2(g)→ 2CO2(g) + 2H2O(l); ΔH = − 336.2 kcal. The approximate value of ΔU  at 300 K for the same reaction (R = 2 cal degree− 1 mol− 1) will be-

    Solutions

    C2H4(g) + 3 O2(g)→2 CO2(g) + 2 H2O(l)

    At 300 K ΔH = − 336.2 kcal

    Δng = 2 − (1 + 3) = − 2

    T = 300 K, ΔH = − 336.2 kcal,

    R = 2 × 10−3 kcal degree−1 mol−1

    ΔH = ΔU+ ΔngRT

    − 336.2 = ΔU + (− 2) × 300 × 2 × 10−3

    ΔU = − 336.2 + 1.2 = − 335.0 kcal

     

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