21.

In the hydrolysis of an organic chloride in presence of large excess of water

RCl + H₂O → ROH + HCl

• molecularity and order of reaction both are 2

• molecularity is 2 but order of reaction is 1

• molecularity is 1 but order of reaction is 2

• molecularity is 1 but order of reaction is also 1

Which of the following statements regarding ozone is not correct? 

• The ozone molecule is angular in shape.

• The ozone is a resonance hybrid of two structures. 

• The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen

• Ozone is used as germicide and disinfectant for the purification of air

When a manganous salt is fused with a mixture of KNO₃ and solid NaOH, the oxidation number of Mn changes from +2 to

• +4

• +3

• +6

• +7

Ortho and para hydrogens have

• Identical chemical properties but different physical properties 

• Identical physical and chemical properties 

• Identical physical properties  but different chemical properties 

• Different chemical and physical properties 

On mixing alkane with chlorine and irradiating with ultraviolet light, it forms only one monochloroalkane. The alkane is

• Propane

• Pentane 

• Iso-pentane

• Neo-pentane

In which of the following molecules is hydrogen bridge bond present?

• Water

• Inorganic benzene

• Diborane

• Methanol

What is obtained when nitrobenzene is treated sequentially with (i) NH₄Cl/Zn dust and (ii) H₂SO₄/Na₂Cr₂O₇?

• meta-chloronitrobenzene

• para-chloronitrobenzene

• Nitrosobenzene

• Benzene

Aspirin is

• acetyl salicylic acid

• benzoyl salicylic acid

• chloro benzoic acid

• anthranilic acid

The potential of a hydrogen electrode at pH = 10 is 

• 0.59 V

• 0.00 V

• -0.59 V

• - 0.059 

P₄O₁₀ is the anhydride of

• H₃PO₂

• H₃PO₃

• H₃PO₄

• H₄P₂O₇