Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

A 25 W bulb emits monochromatic yellow light of wavelength of 0.57 μm. Calculate the rate of emission of quanta per second.

  • 7.169 x 1019

  • 4.569 x 1019

  • 8.579 x 1019

  • 9.662 x 1019


12.

The correct set of quantum numbers for the unpaired electron of a chlorine atom is :

  • 2 , 0 , 0 , +12

  • 2 , 1 , -1 , +12

  • 3 , 1 , -1 , ±12

  • 3 , 0 , 0 , ±12


13.

Calculate the radius of a water molecule assuming to be spherical (density= 1 g mL-1) :

  • 1.925 10-8 cm

  • 1.925x 10-9 cm

  • 1.925 10-10 cm

  • 1.925 10-11 cm


14.

When 6 g of a monobasic acid is dissolved in 100 mL solution , it is l N. What is equivalent mass of the acid ?

  • 20 g equiv-1

  • 40 g equiv-1

  • 60 g equiv-1

  • 80 g equiv-1


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15.

Each NH3 molecule has six other NH3 molecules as nearest neighbours in solid state ; H of sublimation of NH3 molecule at the m.p. is 30.8 kJ mol-1 and in the absence of H-bonding estimated Ml of sublimation is 14.4 kJ mol-1 .Hence , strength of H-bond in solid NH3 is :

  • 5.47 kJ mol-1

  • 10.93 kJ mol-1

  • 16.40 kJ mol-1

  • - 16.40 kJ mol-1


16.

Which of the following compounds is the weakest Bronsted base ?


17.

Which one ofthe following is not tetrahedral in shape ?

  • SiCl4

  • NH4+

  • CH4

  • SF4


18.

When 2.495 g of CuSO· x H2O (molar mass 249.5) is heated, 0.05 mole of H2O is lost. Therefore , x is :

  • one

  • three

  • five

  • seven


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19.

N2O is isoelectronic to CO2 and N3-. Which of the following is the structure of N2O ?

  • N-O-N

  • N-N-O


C.

N-N-O

N2O is isoelectronic with COand N3. Hence, its structure is linear i.e. , N=N ➔ 0.


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20.

Number of lone pair in XeOF4 is :

  • zero

  • one

  • two

  • three


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