Experimentally it was found that a metal oxide has formula M0.98

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.00C. As it does so, it absorbs 208J of heat. The values of q and w for the process will be:(R = 8.314 J/mol K) ( ln 7.5 = 2.01)

  • q =+208J, W = - 208 J

  • q =-208 J, W =-208 J

  • q=-208J, W = +208 J

  • q=-208J, W = +208 J

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2.

For the gaseous state, if most probable speed is denoted by C*, average speed by C and mean square speed by C, then for a large number of molecules the ratios of these speeds are:

  • straight C asterisk times colon stack space straight C with bar on top space colon thin space straight C space equals space 1.225 space colon 1.128 space space colon 1
  • straight C to the power of asterisk times space colon thin space straight C with bar on top space colon space straight C space equals space 1.128 space colon thin space 1.225 space colon space 1
  • straight C to the power of asterisk times space colon thin space straight C with bar on top space colon space straight C space equals space 1.28 space colon thin space 1.225 space colon space
  • straight C to the power of asterisk times space colon thin space straight C with bar on top space colon space straight C space equals space 1.28 space colon thin space 1.225 space colon space
325 Views

3.

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2.The empirical formula of the hydrocarbon is 

  • C2H4

  • C3H4

  • C6H5

  • C6H5

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4.

In which of the following pairs of molecules/ions, both the species are not likely exist?

  • straight H subscript 2 superscript plus comma space He subscript 2 superscript 2 minus end superscript
  • straight H subscript 2 superscript minus comma space He subscript 2 superscript 2 minus end superscript
  • straight H subscript 2 superscript 2 plus end superscript comma He subscript 2
  • straight H subscript 2 superscript 2 plus end superscript comma He subscript 2
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5.

Which of the following exists as covalent crystals in the solid state?

  • Iodine

  • Silicon

  • Sulphur

  • Sulphur

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6.

Which of the following represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar?

  • Ca <S<Ba<Se<Ar

  • S< Se<Ca<Ba< Ar

  • Ba< Ca<Se< S< Ar

  • Ba< Ca<Se< S< Ar

491 Views

7.

Energy of an electron is given by
E =- 2.178 x 10-18open parentheses straight Z squared over straight n squared close parentheses
Wavelength of light required to excite an electron in a hydrogen atom from level n =1 to n=2 will be (h=6.62 x 1034 Js and c = 3.0 x 108 ms-1

  • 1.214 x 10-7 m

  • 2.816 x 10-7 m

  • 6.500 x 10-7 m

  • 6.500 x 10-7 m

504 Views

8.

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be

  • -2.55 eV

  • -5.1 eV

  • -10.2 eV

  • -10.2 eV

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9.

Stability of the species Li2, Li2 and Li2+ increases in the order of:

  • Li2 < Li2+ < Li2-

  • Li2 < Li2+ < Li2 

  • Li2< Li2 < Li2+

  • Li2< Li2 < Li2+

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10.

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+ and M3+ in its oxide. The fraction of the metal which exists as M3+ would be:

  • 7.01%

  • 4.08%

  • 6.05%

  • 6.05%


B.

4.08%

Metal oxide = M0.98O
If ‘x’ ions of M are in +3 state, then
3x + (0.98 – x) × 2 = 2
x = 0.04
So the percentage of metal in +3 state would be

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