21.

Quantitative measurement of nitrogen in an organic compound is done by the method :

• Berthelot method

• Belstein method

• Lassaigne test

• Kjheldahl method

Brown ring in the test of NO₃^-  is formed due to the formation of :

• FeSO₄ ^. NO

• [Fe(SO₄)₂ ^. NO] H₂O

• Fe(SO₄)₃ ^. NO

• none of these

Which of the following is a false statement ?

• Fluorine is more electronegative than chlorine

• Nitrogen has greater IE₁ than oxygen

• Lithium is amphoteric

• Chlorine is an oxidising agent

Which kind of fission is favoured by sunlight ?

• Heterolytic fission

• Homolytic fission

• Both (a) and (b)

• None of the above

The reagent used in Gatterman Koch aldehyde synthesis is :

• Pb/BaSO₄

• alkaline KMnO₄

• acidic KMnO₄

• CO + HCl

Which type of isomerism is shown by propanal and propanone ?

• Functional group

• Metamerism

• Tautomerism

• Chain isomerism

Which of the following is a use of alum ?

• Making explosives

• Bleaching clothes

• Water softening

• All of the above

Cetane is a compound which has very good ignition property .Chemically it is :

• CH₃(CH₂)₁₄CH₃

• (CH₃)₃C(CH₂)₁₁CH₃

• C₁₇H₃₄

• None of the above

The oxidation number of carbon in CH₂O is :

• - 2

• + 2

• 0

• + 4

Which of the following reaction involves oxidation and reduction ?

• NaBr + HCl $\to$ NaCl + HBr

• HBr + AgNO₃ $\to$ AgBr + HNO₃

• H₂ + Br₂ $\to$ 2HBr

• Na₂O + H₂SO₄ $\to$ Na₂SO₄ + H₂O