The value of amu is which of the following? from Chemistry NEET

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Lowest MP and BP is of

  • Ar

  • Xe

  • He

  • Ne


12.

H3PO3 is

  • dibasic acid

  • basic

  • tribasic acid

  • neutral


13.

35.4 mL of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is?

  • 0.97 N

  • 0.142 N

  • 0.194 N

  • 0.244 N


14.

When H2S gas is passed in a metal sulphate solution in presence of NH4OH, a white precipitate is produced. The metal is identified as

  • Zn

  • Fe

  • Pb

  • Hg


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15.

The value of amu is which of the following?

  • 1.57 × 10-24 kg

  • 1.66 × 10-24 kg

  • 1.99 × 10-23 kg

  • 1.66 × 10-27 kg


D.

1.66 × 10-27 kg

amu represents atomic mass unit. It is used in place of unified mass unit.

1 amu = 1 Avogram = 1 Aston = 1 Dalton

1 amu = 112 ×  mass of C-12 atom

          = 112 × 1.9924 × 10-23 g

          = 1.66 × 10-24

          = 1.66 × 10-27 g

Therefore, the correct option is d.


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16.

The molecule having largest dipole moment among the following is

  • CHI3

  • CH4

  • CHCl3

  • CCl4


17.

Which of the following electronic configuration represents noble gas?

  • ns2np6

  • ns2np5

  • ns2np4

  • ns2np3


18.

The molarity of pure water is:

  • 100

  • 55.6

  • 18

  • 5.56


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19.

The most reactive hydrocarbon is :

  • methane

  • ethane

  • ethylene

  • acetylene


20.

The density of SO2 at STP is 2.86 kg m3. Its density at 819°C and 2 atmospheres is:

  • 0.715 kg m-3

  • 1.43 kg m-3

  • 2.86 kg m-3

  • 4.26 kg m-3


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