JEE Chemistry Solved Question Paper 2008 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Microcosmic salt is

  • Na4P2O7

  • Na(NH4)HPO4

  • Na(NH3)HPO4H2O

  • MgNH4PO4


2.

The C-O-H bond angle in ethanol is nearly

  • 90°

  • 104°

  • 120°

  • 180°


3.

A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 K, the pKb of NH4OH is 5.0. The pH of the buffer is

  • 10.0

  • 9.0

  • 6.0

  • 8.0


4.

Among NH3, HNO3, NaN3 and Mg3N2 the number of molecules having nitrogen in negative oxidation state is

  • 1

  • 2

  • 3

  • 4


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5.

Born-Haber cycle may be used to calculate

  • electronegativity

  • mass number

  • oxidation number

  • electron affinity


6.

The heat of formation for CO2 (g), H2O (l) and CH4 (g) are -400 kJ mol-1, -280 kJ mol-1 and -70 kJ mol-1 respectively. The heat of combustion of CH4 in kJ mol-1 is

  • 890

  • -160

  • -890

  • -90


7.

The molecule having zero dipole moment is

  • CH2Cl2

  • BF3

  • NF3

  • ClF3


8.

The bond angle is smallest in

  • H2O

  • H2S

  • BeCl2

  • N2O


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9.

Oxygen and sulphur both are the member of same group in periodic table but H2O is liquid while H2S is gas because

  • molecular weight of water is more

  • electronegativity of sulphur is more

  • H2S  is weak acid

  • water molecules are having weak hydrogen bonds between them


10.

Diffusion of helium gas is four times faster than

  • CO2

  • SO2

  • NO2

  • O2


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