31.

In which one of the following properties, physiorption and chemisorption resemble each other?

• Force of attraction

• Enthalpy of adsorption

• Temperature effect

• Effect of surface area

Consider the following two complex ions : [CoF₆]^3- and [Co(C₂O₄)₃]^3-. Which of the following statement(s) is/are false?

I. Both are octahedral.

II. [Co(C₂O₄)₃]^3- is diamagnetic while [CoF₆]^3- is paramagnetic.

III. Both are outer orbital complexes.

IV. In both the complexes, the central metal is in the same oxidation state.

• Both II and III

• II, III and IV

• Only III

• Both III and IV

Chlorophyll is a coordination compound of

• Iron

• Magnesium

• Manganese

• Zinc

Freon 12 is manufactured from CCl₄ by

• Wurtz reaction

• Swarts reaction

• Fittig reaction

• Wurtz-Fittig reaction

Which one of the following group 16 elements does not exist in -2 oxidation state?

• S

• Se

• O

• Po

In which one of the following compounds of xenon, highest number of lone pair of electrons is present in xenon?

• XeF₆

• XeF₄

• XeF₂

• XeOF₃

The hybridised state of Al³⁺ in the complex ion formed when AlCl₃ is treated with aqueous acid is

• sp³

• dsp²

• sp³d²

• sp²d

Enzymatic reactions are given in Column I and enzymes in Column II.

Choose the correct matching of enzymatic reaction and enzyme that catalyses the correct reaction from the codes given below.

• A - ii; B - iv; C - v; D - iii; E - i

• A - iii; B - iv; C - i; D - v; E - ii

• A - v; B - iv; C - ii; D - i; E - iii

• A - v; B - iii; C - iv; D - ii; E - i

Which one of the following involves nucleophilic addition?

• Kolbe's reaction of phenol

• Williamson synthesis of ethers

• Aldol formation from ethanol

• Reimer-Tiemann reaction of phenol

375 mg of an alcohol reacts with required amount of methyl magnesium bromide and releases 140 mL of methane gas at STP. The alcohol is

• ethanol

• n-butanol

• methanol

• n-propanol