JEE Chemistry Solved Question Paper 2007 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

Advertisement
1.

Which one of the following compounds has the smallest bond angle in its molecule ?

  • SO2

  • OH2

  • SH2

  • NH3


2.

The solubility in water of a sparingly soluble salt AB2 is 1.0 × 10-5 mol L-1. Its solubility product number will be

  • 4 × 10-15

  • 4 × 10-10

  • 1 × 10-15

  • 1 × 10-10


3.

If at 298 K the bond energies of C-H, C-C, C=C and H-H bonds are respectively 414, 347, 615 and 435 kJ mol-1, the value of enthalpy change for the reaction

H2C=CH2 (g) + H2 (g) → H3C - CH3 (g) at 298 K will be

  • +250 kJ

  • -250 kJ

  • +125 kJ

  • -125 kJ


4.

The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH is

  • CH3NH2 < NH3 < (CH3)2NH

  • (CH3)2NH < NH3 < CH3NH2

  • NH3 < CH3NH< (CH3)2NH

  • CH3NH< (CH3)2NH < NH3


Advertisement
5.

The solubilities of carbonates decrease down the magnesium group due to a decrease in

  • lattice energies of solids

  • hydration energies of cations

  • inter-ionic attraction

  • entropy of solution formation


6.

Due to the presence of an unpaired electron free radicals are

  • cations

  • anions

  • chemically inactive

  • chemically reactive


7.

Consider the reaction,

N2 + 3H2 → 2NH3

carried out at constant temperature and pressure. If H and U are the enthalpy and internal energy changes for the reaction, which of the following expression is true?

  • H > U

  • H <U

  • H = U

  • H = 0


8.

The molecular shapes of SF4, CF4 and XeF4 are

  • different with 1, 0 and 2 lone pairs of electrons on the central atom, respectively

  • different with 0, 1 and 2 lone pairs of electrons on the central atom, respectively

  • the same with 1, 1 and 1 lone pair of electrons on the central atoms, respectively

  • the same with 2, 0 and 1 lone pairs of electrons on the central atom, respectively


Advertisement
9.

The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 × 107 m-1)

  • 91 nm

  • 192 nm

  • 406 nm

  • 9.1 × 10-8 nm


10.

What is the equilibrium expression for the reaction

P4 (s) + 5O2 (g)  P4O10 (s) ?

  • KcP4O10[P4][O2]5

  • KcP4O105[P4][O2]

  • Kc = [O2]5

  • Kc1[O2]5


Advertisement