When n-hexane is heated with anhydrous AlCl₃ and HCl gas, the major product obtained is

• 1-chlorohexane

• 2-chlorohexane

• 3-chlorohexane

• mixture of 2-methylpentane and 3-methylpentane

How many monochloro structural isomers are expected in free radical monochlorination of 2-methylbutane?

• 3

• 4

• 5

• 6

23.

Green chemistry deals with

• study of plant physiology

• study of extraction of natural products from plants

• detailed study of reactions involved in the synthesis of chlorophyll

• utilization of existing knowledge base for reducing the chemical hazards along with developmental activities

Potassium dichromate belongs to which crystal system?

• Tetragonal

• Orthorhombic

• Triclinic

• Hexagonal

The reaction of H₂ is given below

H₂ + CO + R - CH = CH₂ → R - CH₂

-CH₂-CHO is specifically called as

• hydrogenation

• reduction

• hydroformylation

• dehydration

Which one of the following is an incorrect statement?

• O₃ oxidises PbS to PbSO4

• O₃ oxidises nitric oxide to nitrogen dioxide

• O₃ oxidises aqueous Kl at pH = 9.2

• The two oxygen-oxygen bond lengths in O₃ are different

A sample of sea water contains 5 × 10^-3 g of dissolved oxygen in 1 kg of the sample. The concentration of O₂ in that sea water sample in ppm is

• 5

• 5 × 10^-3

• 5 × 10^-2

• 5 × 10^-1

In a reaction, 2A + B → 3C, the concentration of A decreases from 0.5 mol L^-1 to 0.3 mol L^-1 in 10 minutes. The rate of production of 'C' during this period is

• 0.01 mol L^-1 min^-1

• 0.04 mol L^-1 min^-1

• 0.05 mol L^-1 min^-1

• 0.03 mol L^-1 min^-1

Ammonium ion (NH₄⁺) reacts with nitrite ion (NO${}_2^{-}$) in aqueous solution according to the equation

NH₄⁺ (aq) + NO${}_2^{-}$ (aq) → N₂ (g) + 2H₂O (l)

The following initial rates of reaction have been measured for the given reactant concentrations.

Which of the following is the rate law for this reaction?

• Rate = k[NH₄⁺][NO${}_2^{-}$]⁴

• Rate = k [NH${}_4^{+}$][NO${}_2^{-}$]

• Rate = k [NH${}_4^{+}$][NO${}_2^{-}$]²

• Rate = k[NH${}_4^{+}$]²[NO${}_2^{-}$]

Gold sol can be prepared by

• reduction of gold (Ill) chloride with formalin solution

• hydrolysis of gold (III) chloride

• oxidation of gold by aqua-regia

• peptization