Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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21.

When NaCl is dissolved in water , the sodium ions becomes :

  • oxidised

  • reduced

  • hydrolysed

  • hydrated


D.

hydrated

NaCl H2O Na+ + Cl+

Na+ ions and Cl- ions are hydrated by water molecules to stop the again precipitation of NaCl molecules .


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22.

Which of the following is used as moderator :

  • Hard water

  • Heavy water

  • Non-ionised water

  • Mineral water


23.

When SO2 gas is passed through an acidified K2Cr2O7 solution :

  • the solution becomes blue

  • SO2 gets reduced

  • Cr(SO4)3 is formed

  • the solution becomes colourless


24.

In the following reaction ,

P4 + 3NaOH + 3H2 PH3 + 3NaH2PO2

  • phosphorus is oxidised

  • phosphorus is oxidised and reduced

  • phosphorus is reduced

  • sodium is oxidised


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25.

Which of the following will show aromatic behaviour ?

  • None of these


26.

The temporary hardness of water due to calcium bicarbonate can be removed by adding :

  • CaCO3

  • Ca(OH)2

  • CaCl2

  • HCl


27.

Which one does not form oxide on heating ?

  • ZnCO3

  • CaCO3

  • Li2CO3

  • Na2CO3


28.

White lung cancer is caused by :

  • asbestos

  • silica

  • paper

  • textiles


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29.

The substance used in smoke screen is :

  • sodium chloride

  • sodium phosphate

  • calcium fluoride

  • calcium phosphide


30.

Which of the following complexes do not follow EAN rule ?

  • [Fe(CN)6]4-

  • [Fe(CN)6]3-

  • Ni(CO)4

  • [PdCl4]2-


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