JEE Chemistry Solved Question Paper 2012 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

  • Mg< Ca< Cl< P

  • Cl <P <Mg< Ca

  • P <Cl< Ca< Mg

  • Ca <Mg <P < Cl


2.

The reaction

           2A(g) + B(g) 3C(g) + D(g)

is begun with the concentrations of A and B both at an initial value of 1.00 M. When equilibrium is reached, the concentration of D is measured and found to be 0.25 M. The value for the equilibrium constant for this reaction is given by the expression

  • [(0.75)3 (0.25)] ÷ [(1.00)2 (1.00)]

  • [(0.75)3 (0.25)] ÷ [(0.50)2 (0.75)]

  • [(0.75)3 (0.25)] ÷ [(0.50)2 (0.25)]

  • [(0.75)3 (0.25)] ÷ [(0.75)(0.25)]


3.

The pressure exerted by 6.0g of methane gas in a 0.03 mvessel at 129°C is (Atomic masses: C = 12.01, H = 1.01 and R= 8.314JK-1 mol-1)

  • 215216 Pa

  • 13409 Pa

  • 41648 Pa

  • 31684 Pa


4.

Match List I (Equations) with List II (Types of process) and select the correct option.
 

List I

(Equation)

 

List II

(Types of process)

A. Kp >Q 1. Non-spontaneous
B. G° < RT in Q  2. Equilibrium
C. Kp =Q 3. Spontaneous and endothermic
D. T > HS 4. Spontaneous

  • A B C D
    1 2 3 4
  • A B C D
    3 4 2 1
  • A B C D
    4 1 2 3
  • A B C D
    2 1 1 3

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5.

Among the following which one has the highest cation of anion size ratio?

  • Csl

  • CsF

  • LiF

  • NaF


6.

Some of the properties of the two species, NO3- and H3O+ are described below. Which one of them is correct?

  • Dissimilar in hybridisation for the central atom with different structures

  • Isostructural with same hybridisation for the central atom

  • Isostructural with different hybridisation for the central atom

  • Similar in hybridisation for the central atom with different structures


7.

Which has the maximum number of molecules among the following?

  • 44 g CO2

  • 48 g O3

  • 8g H2

  • 64g SO2


8.

Consider the following processes H (kJ/mol)

      12A   B + 1503B  2C + D - 125E+A  2D + 350for B+ D  E + 2C, H will be

  • 525 k.J/mol

  • -175 kJ/mol

  • -325kJ/mol

  • 325 kJ/mol


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9.

Which of the following structures is the most preferred and hence of lowest energy for SO3?


10.

What is the value of electron gain enthalpy of Na if IE1 of Na = 5.1 eV?

  • -5.1 eV

  • -10.2 eV

  • +2.55 eV

  • +10.2eV


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