Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Argon is used

  • in filling airships

  • to obtain low temperature

  • in high temperature welding

  • in radiotherapy for treatment of cancer


C.

in high temperature welding

Argon is used in high temperature welding and other operations which require a non-oxidising atmosphere and the absence of nitrogen.


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12.

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

  • O816

  • O818

  • Ne1018

  • O2-816


13.

56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atrn. The partial pressures of oxygen and nitrogen (in atm) are respectively

  • 4, 6

  • 5, 5

  • 2, 8

  • 6, 4


14.

The metal that produces red-violet colour in the non-luminous flame is

  • Ba

  • Ag

  • Rb

  • Pb


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15.

According to the first law of thermodynamics which of the following quantities represents the change in a state function?

  • qrev

  • qrev - Wrev

  • qrevWrev

  • qrev + Wrev


16.

The expression for the solubility product of Ag2CO3 will be

  • Ksp = s2

  • Ksp = 4s3

  • Ksp = 27s4

  • Ksp = s


17.

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? (h = 6.626x 10-34 J-s; velocity of light = 3x108 ms-1)

  • 1 x 1019

  • 1 x 1020

  • 1 x 1021

  • 1 x 1023


18.

Which of the following fluorides does not exist?

  • NF5

  • PF5

  • AsF5

  • SbF5


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19.

Red lead is

  • PbO

  • PbO2

  • Pb3O4

  • Pb2O3


20.

Which will liberate bromine from a solution of potassium bromide?

  • I2

  • Cl2

  • SO2

  • HI


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