The oxidation states of Cr in [Cr(H₂O)₆]Cl₃,[Cr(C₆H₆)2], and K₂[Cr(CN)₂ (O)₂(O₂)(NH₃)] respectively are :

• +3, +2, and +4

• +3, 0, and +6

• +3, 0, and +4

• +3, +4, and +6

Which of the following compounds will be suitable for Kjeldah1’s method for nitrogen estimation?

Glucose on prolonged heating with HI gives

• 6-iodohexanal

• n-Hexane

• 1-Hexene

• Hexanoic acid

The increasing order of basicity of the following compounds is:

• (d) < (b) < (a) < (c)

• (a) < (b) < (c) < (d)

• (b) < (a) < (c) < (d)

• (b) < (a) < (d) < (c)

25.

Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. A reacts with Br₂ to form product B. A and B are respectively:

• 

• 

• 

• 

The major product formed in the following reaction is:

Phenol on treatment with CO₂ in the presence of NaOH followed by acidification produces compound X as the major product. X on treatment with (CH₃CO)₂O in the presence of catalytic amount of H₂SO₄ produces:

The major product of the following reaction is,

The compound that does not produce nitrogen gas by the thermal decomposition is

• (NH₄)₂SO₄

• Ba(N₃)₂

• (NH₄)₂Cr₂O₇

• NH₄NO₂

Which of the following salts is the most basic in aqueous solution?

• Pb(CH₃COO)₂

• Al(CN)₃

• CH₃COOK

• FeCl₃