21.

Oxidation number Fe in K₃ [FeCN)₆] is

• +1

• +2

• +3

• +4

The oxide that gives H₂O₂ on treatment with dilute acid is

• PbO₂

• MnO₂

• Na₂O₂

• TiO₂

CH₃CHCl₂, on hydrolysis, will give

• CH₃CHO

• CH₃COOH

• CHCl₃

• CH₃CH₂OH

What is obtained, when potassium succinate soluton is electrolysed ?

• Ethane

• Ethene

• Ethyne

• All of these

Which of the following has the maximum acidic strength ?

• p-nitrophenol

• p-nitrobenzoic acid

• o-nitrobenzoic acid

• m-nitrobenzoic acid

Lunar caustic is

• AgCl

• AgNO₃

• NaOH

• KNO₃

CH₃COOH $\stackrel{\mathrm{P}/{\mathrm{Br}}_2}{\to }$ CH₂BrCOOH

This reaction is called

• Schotton-Bauman reaction

• Finkelstin reaction

• Hell-Volhard-'Zelinsky reaction

• none of the above

What is 'X' in the following sequence ?

ArN₂Cl $\underset{\mathrm{KCN}}{\overset{\mathrm{CuCN}}{\to }}$ Z $\stackrel{\mathrm{H}.\mathrm{OH}}{\to }$ Y $\underset{∆}{\overset{\mathrm{soda}-\mathrm{lime}}{\to }}$ X

• Benzoic acid

• Sodium benzoate

• Benzaldehyde

• Benzene

Bauxite is an ore of

• boron

• barium

• aluminium

• bismuth

Which of the following turns potassium dichromate paper green?

• NO₂

• HCl

• NH₃

• SO₂