21.

Which one of the following will most readily be dehydrated in acidic solution?

• 

• 

• 

• 

K₂[HgI₄] detects the following ion

• Cl^-

• NO${}_2^{-}$

• NO${}_3^{-}$

• NH${}_4^{+}$

Which is the correct statement?

• Hydrogen peroxide can oxidise permanganate ion.

• Permanganate ion can oxidise manganous ion.

• Manganate ion is more stable than permanganate ion.

• Permanganate ion cannot be reduced to manganate ion

Vapour pressure of a solution at 100° C having 3.42 g of cane sugar in 180 g water is

• 759.2 mm

• 760 mm

• 740 mm

• 748.5 mm

The correct representation of a complex ion is

• [Co(H₂O)(NH₃)₄Cl]²⁺

• [CoCl(H₂O)(NH₃)₄]²⁺

• [Co(NH₃)₄Cl(H₂O)]²⁺

• [Co(NH₃)₄(H₂O)Cl]²⁺

Chlorine is least reactive in

• methyl chloride

• ethyl chloride

• vinyl chloride

• allyl chloride

Calcination is used in metallurgy for removal of

• water and sulphide

• water and CO₂

• CO₂ and H₂S

• H₂O and H₂S

What is the value of x on the [Ni(CN)₄]^x complex ion?

• +2

• -2

• 0 (zero)

• +4

75% of a first order reaction was completed in 32 min. When was 50% of the reaction completed?

• In 16 min

• In 24 min

• In 8 min

• In 4 min

The activation energy of a reaction is zero. The rate constant of this reaction

• Increases with an increase of temperature

• decreases with an increase of temperature

• decreases with decrease of temperature

• is independent of temperature