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Chemistry Test 259
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Chemistry Test 259
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  • Question 1/10
    4 / -1

    For the reaction 2HI(g) ⇌ H2(g) + I2( g) The degree of dissociation (α) of HI(g) is related to equilibrium constant, Kp by the expression

    Solutions

     

  • Question 2/10
    4 / -1

    In graphite, electrons are

    Solutions

    In graphite, each carbon is sp2-hybridized and the single occupied unhybridized porbitals of C-atoms overlap side wise to give π-electron cloud which is delocalized and thus the electrons are spread out between the structure.

     

  • Question 3/10
    4 / -1

    The half-life of a reaction A → product is increased two times when the concentration of A is double. The order of the reaction is

    Solutions

    For a zero-order reaction, the half-life is directly proportional to the initial concentration of A. Hence, the reaction is of zero order.

     

  • Question 4/10
    4 / -1

    The correct order of pseudohalide, polyhalide and interhalogen are

    Solutions

    Some complex ions of nitrogen show similarities with halide ions. These are called pseudohalide ions e.g., NCO−,CN−etc.

    Halogen, among themselves, form complex ions which are called polyhalide ions. e.g., I−3,BrI−2 etc.

    Similarly, interhalogens are the compounds of halogen in which one halogen is cation and other halogen is anion. E.g., IF7, ICl5, BrF3,IF5 etc .

     

  • Question 5/10
    4 / -1

    Oxymercuration-demercuration of CH3CH = CH2 produces

    Solutions

    In oxymercuration - demercuration, more stable carbocation is formed and water attacks on more substituted carbon. The reaction is as follows:

  • Question 6/10
    4 / -1

    The incorrect statement is:

    Solutions

    (1) [Fe(H2O)6]2+, Fe2+ → 3d6 → 4 unpaired electron

    [Cr(H2O)6]2+, Cr2+ → 3d4 → 4 unpaired electron

    (2) [Ni(NH3)4(H2O)2]2+, Ni2+ → 3d8 → 2 unpaired electron

    μm = 2.83 B.M

    (3) In gemstone, ruby has Cr3+ ion occupying the octahedral sites of aluminium oxide (Al2O3) normally occupied by Al3+ ion.

    (4) The complementary color of violet is yellow.

     

  • Question 7/10
    4 / -1

    Assertion A: Enol form of acetone [CH3COCH3] exists in < 0.1% quantity. However, the enol form of acetyl acetone [CH3COCH2OCCH3] exists in approximately 15% quantity.

    Reason R: Enol form of acetyl acetone is stabilised by intramolecular hydrogen bonding, which is not possible in enol form of acetone.

    Solutions

     

  • Question 8/10
    4 / -1

    For the reaction given below:

    The compound which is not formed as a product in the reaction is a

    Solutions

     

  • Question 9/10
    4 / -1

    Which one of the following reactions will not yield propionic acid?

    Solutions

    All except option 1 give propionic acid as the product, but option 1 yields butanoic as the product.

     

  • Question 10/10
    4 / -1

    Two statements are given below:

    Statement I: The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms acid immediately below and above it in the series.

    Statement II: The solubility of monocarboxylic acids in water decreases with increase in molar mass.

    Solutions

    Statement I is correct as monocarboxylic acids with even number of carbon atoms show better packing efficiency in solid state. Statement II is also correct as the solubility of carboxylic acids decreases with increase in molar mass

     

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