The ONO angle is maximum in from Chemistry NEET Year 2004 Free S

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Dimethyl glyoxime gives a red precipitate with Ni2+, which is used for its detection. To get this precipitate readily the best pH range is

  • < 1

  • 2-3

  • 3- 4

  • 9- 11


2.

The statement true for N3- is

  • it has a non-linear structure

  • it is called pseudohalogen

  • the formal oxidation state of nitrogen in this anion is -1

  • it is isoelectronic with NO2


3.

Shape of O2F2 is similar to that of

  • C2F2

  • H2O2

  • H2F2

  • C2H2


4.

The liquefied metal expanding on solidification is

  • Ga

  • Al

  • Zn

  • Cu.


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5.

The compound insoluble in water is

  • mercurous nitrate

  • mercuric nitrate

  • mercurous chloride

  • mercurous perchlorate.


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6.

The ONO angle is maximum in

  • NO3-

  • NO2-

  • NO2

  • NO2+


D.

NO2+

The nitrate ion has three resonance structure, with the double bond on a different oxygen for each. In all resonance structures the nitrogen has three bonds, therefore, its hybridisation is sp2. Each of the oxygen atoms also has sp2 hybridisation, since the hybridisation is determined by the resonance structure with the double bond, where the oxygen has a double bond and two lone pairs.

The actual geometry of the polyatomic ion is trigonal planar with bond angles of 120°,

NO2-:18 electrons; ideal geometry trigonal planar, sp2 with bond angle of 116°.

NO2 : 17 electrons, ideal geometry trigonal planar; sp2 with bond angle of 134°.

NO2+: 16 electrons; ideal geometry linear ; sp with bond angle of 180°,

               O....=N+=O....


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7.

The dipole moment is the highest for

  • trans-2-butene

  • 1,3-dimethylbenzene

  • acetophenone

  • ethanol.


8.

For principle quantum number n = 4, the total number of orbitals having l= 3 is

  • 3

  • 7

  • 5

  • 9


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9.

How much energy is released when 6 moles of octane is burnt in air? Given Hf° for CO2(g) , H2O(g) and C8H18(l)  respectively are - 490, -240 and +160 kJ/mol.

  • -6.2 kJ

  • -37.4 kJ

  • -35.5 kJ

  • -20.0 kJ


10.

For the equilibrium H2O(l)  H2O(g) at 1 atm and 298K.

  • standard free energy change is equal to zero (G°= 0)

  • free energy change is less than zero (G° < 0)

  • standard free energy change is less than zero (G°< 0)

  • standard free energy change is greater than zero (G° > 0).


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