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2351. The chemical formula of plaster of Paris is

A. CaSO4.2H2O B. CaO C. CaSO4.(1/2)H2O D. Ca(OH)2 E. CaCO3

2352. In the Solvay process, the raw materials used are

A. sodium hydroxide and chlorine B. potassium chloride and water C. sodium sulphate and coke D. sodium chloride, limestone and ammonia E. calcium chloride and ammonia only

2353. Lime water turns milky on passing carbon dioxide because of the formation of

A. calcium carbonate B. calcium hydroxide C. carbonic acid D. calcium oxide E. calcium bicarbonate

2354. Boron trifluoride acts as a Lewis acid because boron

A. forms hydrogen bonds B. is a metal C. has a lone pair D. has an incomplete octet E. is highly electronegative

2355. Aluminium oxide is described as amphoteric because it reacts with

A. neither acids nor bases B. both acids and bases C. water only D. bases only E. acids only

2356. The reluctance of the ns2 electrons to take part in bonding in heavier p-block elements is called

A. the lanthanide contraction B. hyperconjugation C. the inert pair effect D. the diagonal relationship E. the shielding effect

2357. The strongest oxidizing agent among the halogens is

A. bromine B. chlorine C. iodine D. astatine E. fluorine

2358. Bleaching powder is prepared by passing chlorine over

A. dry slaked lime B. limestone C. quicklime D. calcium sulphate E. sodium hydroxide solution

2359. Which oxide of nitrogen is known as laughing gas?

A. N2O3 B. N2O C. NO D. NO2 E. N2O5

2360. A transition element is one that has a partially filled

A. f subshell B. s subshell C. d subshell D. valence shell of eight electrons E. p subshell

2361. The colour of most transition metal ions in solution is due to

A. d to d electronic transitions B. hydrogen bonding C. nuclear transitions D. ionic size E. s to p transitions

2362. In the complex ion hexaamminecobalt(III), the coordination number of cobalt is

A. 5 B. 4 C. 2 D. 3 E. 6

2363. EDTA is an example of a

A. cation B. neutral molecule that cannot coordinate C. hexadentate chelating ligand D. bidentate ligand E. monodentate ligand

2364. Transition metals show variable oxidation states because

A. their ionization energies are very high B. their atomic radii are large C. they form only ionic compounds D. the energies of the ns and (n-1)d electrons are close E. they are all diamagnetic

2365. The hybridization of each carbon atom in ethene is

A. sp3 B. sp2 C. sp D. sp3d2 E. sp3d

2366. The halogenation of alkanes in sunlight proceeds by a

A. free radical substitution mechanism B. electrophilic addition mechanism C. rearrangement D. elimination mechanism E. nucleophilic substitution mechanism

2367. According to Markownikoff's rule, addition of hydrogen bromide to propene gives mainly

A. 1-bromopropane B. propane C. propan-1-ol D. 1,2-dibromopropane E. 2-bromopropane

2368. Benzene characteristically undergoes

A. free radical addition B. nucleophilic addition C. electrophilic substitution D. electrophilic addition E. elimination

2369. A primary alkyl halide reacting with a strong nucleophile typically follows

A. E1 elimination B. electrophilic addition C. the SN1 mechanism D. the SN2 mechanism E. free radical substitution

2370. A Grignard reagent has the general formula

A. RMgX B. RZnX C. RAlX D. RLiX E. RNaX

2371. Controlled oxidation of a primary alcohol gives

A. an ester B. an ether C. an alkane D. a ketone E. an aldehyde

2372. Phenol is more acidic than ethanol because

A. it contains a benzene ring that repels electrons B. the phenoxide ion is stabilized by resonance C. it has a higher molar mass D. it is insoluble in water E. it is a stronger nucleophile

2373. Tollen's reagent is used to distinguish

A. alkanes from alkenes B. alcohols from ethers C. amines from amides D. acids from esters E. aldehydes from ketones

2374. Carboxylic acids are more acidic than alcohols because

A. they have a longer chain B. they contain two oxygen atoms of equal bond length only in the acid C. they are liquids D. the carboxylate ion is resonance stabilized E. they are less soluble

2375. The reaction of a carboxylic acid with an alcohol in the presence of an acid catalyst is called

A. decarboxylation B. esterification C. saponification D. nitration E. hydrolysis

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