The strongest base among the following is

• Amide ion

• Hydroxide ion

• Trimethylamine

• Ammonia

When potassium is reacted with water which compound(s) is are formed preferentially?

• K₂O

• KO₂

• Both K₂O and KO₂

• K₂O₂

Select the most appropriate statement In BF₃.

• All the bonds are completely ionic.

• All the bonds are covalent.

• The B-F bond is partially ionic.

• B-F bond has partial double bond character.

When MnO₂ is fused with KOH and KNO₂ , a coloured compound is formed. Choose the right compound with the appropriate colour.

• K₂MnO₄, green

• KMnO₄, purple

• Mn₂O₃, brown

• Mn₃O₄, black

Identify the case(s) where there is change is oxidation number

• Acidified solution of CrO${}_4^{2-}$

• SO₂ gas bubbled through an acidic solution Cr₂O${}_7^{2-}$

• Alkaline solution of CrO${}_7^{2-}$

• Ammoniacal solution of CrO${}_4^{2-}$

The solution which does not produce precipitate when treated with aqueous K₂CO₃ is

• BaCl₂

• CaBr₂

• MgCl₂

• Na₂SO₄

Lassaigne's test (with silver nitrate) is commonly used to detect halogens such as chlorine, bromine and iodine but not useful to detect fluorine because the product AgF formed is

• Volatile

• Reactive

• Explosive

• Soluble in water

The reaction in propene with HBr is presence of peroxide proceeds through the intermediate

• H₃C - $\underset{.}{\mathrm{C}}$H - CH₃

• H₃C - $\underset{.}{\mathrm{C}}$H -CH₂Br

• H₃C - $\stackrel{\mathrm{Br}}{\stackrel{|}{\mathrm{CH}}} - \stackrel{.}{\mathrm{C}}$H₂

• H₃C - CH₂ - $\stackrel{.}{\mathrm{C}}$H₂

Cycloheptatrienyl cation is

• Non-benzenoid and non-aromatic

• Non-benzenoid and aromatic

• Benzenoid and non-aromatic

• Benzenoid and aromatic

30.

Which of the following is not true about a catalyst?

• Mechanism of the reaction in presence and absence of catalyst could be different.

• Use of catalyst cannot change the order of the reaction

• Catalyst enhances both forward and backwards reaction at equal rate.

• Catalyst participates in the reaction, but not consumed in the process.