41.

Which is correct about physical adsorption?

• High temperature and high pressure favour adsorption

• High temperature and low pressure favour adsorption

• Low temperature and high pressure favour adsorption

• Low temperature and low pressure favour adsorption

Excess of copper in toxic proportions in plants/animals can be removed by chelating with

• EDTA

• ethane-1,2-diamine

• oxalate ion

• D-pencillamine

Which will undergo S_N2 reaction fastest among the following halogen compounds?

• CH₃CH₂F

• CH₃CH₂Cl

• CH₃CH₂Br

• CH₃CH₂I

The α and β -forms of glucose are

• isomers of D(+) glucose and L(-) glucose respectively

• diastereoisomers of glucose

• anomers of glucose

• isomers which differ in the configuration of C-2

Ethanoic acid on heating with ammonia forms compound A which on treatment with bromine and sodium hydroxide gives compound B. Compound B on treatment with NaNO₃/dil.HCl gives compound C. The compounds A, B and C respectively are

• ethanamide, methanamine, methanol

• propanamide, ethanamine, ethanol

• N-ethylpropanamide, methaneisonitrile, methanamine

• ethanamine, bromoethane, ethanediazoniumchloride

Which one of the following forms the constituent of cell wall of plant cells?

• Starch

• Glycogen

• Cellulose

• Amylose

A thermoplastic among the following is

• bakelite

• polystyrene

• terylene

• urea-formaldehyde resin

Consider the following antibiotics

(i) erythromycin
(ii) ofloxacin
(iii) chloramphenicol
(iv) penicillin
(v) tetracycline

The pair of bactericidal antibiotics is

• (i) and (iii)

• (ii) and (iv)

• (iii) and (v)

• (i) and (iv)