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Chemistry Test 273
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Chemistry Test 273
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  • Question 1/10
    4 / -1

    A metal in a compound can be displaced by another metal in the uncombined state. Which metal is a better reducing agent in such a case?

    Solutions

    Concept of Reducing Agent:

    A reducing agent is a substance that loses or "donates" an electron to another substance in a redox chemical reaction. Therefore, a good reducing agent is the one that gets oxidized easily, or in other words, the one that can easily lose electrons.

    Characteristics of a Good Reducing Agent:

    Electron Loss: A better reducing agent is the one that loses more electrons. This is because by losing electrons, the reducing agent gets oxidized and in turn reduces the other substance. This is the basic principle of a redox reaction.

    Reactivity: The reactivity of the metal also determines its capacity as a reducing agent. Metals that are high in the reactivity series are good reducing agents. This is because they can easily lose electrons and get oxidized.

    Stability: Metals that are less stable are better reducing agents because they can easily lose electrons to attain a stable state.

    Hence, Option A is the correct answer - a better reducing agent is the one that loses more electrons.

     

  • Question 2/10
    4 / -1

    In which case change of oxidation number of V is maximum?

    Solutions

     

  • Question 3/10
    4 / -1

    The oxidation number of P in Ba(H2PO2)2, Ba(H2PO3)2 and Ba(H2PO4)2 are respectively

    Solutions

     

  • Question 4/10
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    Solutions

     

  • Question 5/10
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    Which is chlorate (I) ion?

    Solutions

    ClO3- : A very reactive inorganic anion.

    The term chlorate can also be used to describe any compound containing the chlorate ion, normally chlorate salts. 

    Example: Potassium chlorate, KClO3

     

  • Question 6/10
    4 / -1

    How much heat will be required at constant pressure to form 1.28 kg of CaC2 from CaO(s) & C(s) ?

    Given :

    ΔfH°(CaO, s) = -152 kcal/mol

    ΔfH°(CaC2, s) = -14 kcal/mol

    ΔfH°(CO, g) = -26 kcal/mol

    Solutions

     

  • Question 7/10
    4 / -1

    The enthalpy of neutralisation of a weak acid in 1 M solution with a strong base is -56.1 kJ mol-1. If the enthalpy of ionization of the acid is 1.5 kJ mol-1 and enthalpy of neutralization of the strong acid with a strong base is -57.3 kJ equiv-1, what is % ionization of the weak acid in molar solution (assume the acid to be monobasic) ?

    Solutions

    The correct answer is option C

    Ideally, the enthalpy of neutralization should be - 57.3 K.J + 1.5 K.J = - 55.8 KJ.

    But it is - 56.1 KJ.

     

  • Question 8/10
    4 / -1

    From the following data, the heat of formation of Ca(OH)2(s) at 18°C is ………..kcal:

    Solutions

    The correct answer is Option B.

    Ca(s) + O2(g) + H2(g) → Ca(OH)2 , ΔHf = ?

    Desired equation = eq (iii) + eq(i) - eq (ii)

    ΔHf = (−151.80)+(−15.26)−(−68.37)

    ΔHf = (-151.80)+(-15.26)-(-68.37)

    ΔHf = −235.43KCalmol−1

     

  • Question 9/10
    4 / -1

    The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be -

    Solutions

     

  • Question 10/10
    4 / -1

    How many litres of water must be added to litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?

    Solutions

    That means the volume of water added to the original solution of 1 L = 10 −1 = 9 L

     

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