Which of the following order of ionisation energy is correct? fr

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The significant figures in 1.0024, 1.240 and 0.0020 are respectively

  • 5, 4, 2

  • 3, 3, 1

  • 5, 3, 4

  • 5, 3, 2


2.

A golf-ball weigh 40.0 gm. If it is moving with a velocity of 20.0 ms-1, it's de-Broglie wavelength is

  • 1.66 x 10-34 nm

  • 8.28 x 10-32 nm

  • 8.28 x 10-25 nm

  • 1.66 x 10-24 nm


3.

Which is the shortest wavelength line in the Lyman series of the hydrogen spectrum? (R= 1.097 x 10-2 nm-1)

  • 94.21 nm

  • 91.16 nm

  • 911.6 nm

  • 933.6 nm


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4.

Which of the following order of ionisation energy is correct?

  • B < Be < N < C

  • Be > B > C > N

  • B < Be < C < N

  • Be < B < C < N


C.

B < Be < C < N

Ionisation energy generally increase in a period from left to right. But due to comparatively stabler configuration of Be (1s2, 2s2), it has more ionisation energy than Boron (1s2, 2s2, 2p1) Hence, the correct order is : B < Be < C < N.


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5.

Volume of CO2 obtained from complete decomposition of 20 g CaCO3 at STP is

  • 2.24 litre

  • 4.48 litre

  • 20 litre

  • 22.4 litre


6.

The shape of an orbital is determined by

  • n

  • l

  • m

  • s


7.

The enthalpies of all elements in their standard states are

  • zero

  • >0

  • <0

  • unity


8.

Which of the following, is not a unit of pressure?

  • Atmosphere

  • Torr

  • Pascal

  • Newton


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9.

Which of the following ions, has smallest size?

  • Ca2+

  • Cl-

  • S2-

  • K+


10.

Which of the following acids is monobasic?

  • H3PO3

  • H3PO2

  • H2SO3

  • H3PO4


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