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Showing 951 to 975 of 3046 questions (page 39 of 122).

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

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

952. A Grignard reagent has the general formula

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

953. Controlled oxidation of a primary alcohol gives

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

954. Phenol is more acidic than ethanol because

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

955. Tollen's reagent is used to distinguish

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

956. Carboxylic acids are more acidic than alcohols because

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

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

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

958. At its isoelectric point, an amino acid exists mainly as

A. a neutral unionized molecule B. an anion C. a zwitterion D. a free radical E. a cation

959. The linkage joining amino acid residues in a protein is

A. a glycosidic bond B. an ester linkage C. an ionic bond D. a peptide bond E. a disulphide bond only

960. Nylon 6,6 is an example of

A. a condensation polymer B. an addition polymer C. a natural polymer D. a silicone E. an elastomer formed by vulcanization

961. Which of the following is a reducing sugar?

A. glycogen B. cellulose C. sucrose D. starch E. glucose

962. The percentage of nitrogen in urea is about

A. 35% B. 21% C. 46% D. 82% E. 60%

963. Depletion of stratospheric ozone is mainly caused by

A. nitrogen gas B. chlorofluorocarbons C. sulphur dioxide D. carbon dioxide E. methane

964. Acid rain is caused mainly by the oxides of

A. carbon and hydrogen B. sulphur and nitrogen C. silicon and boron D. sodium and potassium E. iron and copper

965. The chief greenhouse gas responsible for the enhanced greenhouse effect is

A. nitrogen B. argon C. oxygen D. carbon dioxide E. helium

966. The stationary phase in thin layer chromatography is usually

A. silica gel or alumina B. the sample itself C. air D. water only E. the mobile solvent

967. Which quantity has the same dimensions as work?

A. pressure B. power C. torque D. impulse E. force

968. The number of significant figures in 1.230 x 10^4 is

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

969. The sum of 2.50 cm and 1.6 cm, expressed to the correct number of decimal places, is

A. 4.100 cm B. 4.16 cm C. 4.10 cm D. 4 cm E. 4.1 cm

970. One radian is approximately equal to

A. 180 degrees B. 6.28 degrees C. 1 degree D. 57.3 degrees E. 3.14 degrees

971. Two vectors of magnitudes 3 and 4 units give a resultant of 7 units. The angle between them is

A. 180 degrees B. 0 degrees C. 45 degrees D. 120 degrees E. 90 degrees

972. The cross product of a vector with itself is

A. undefined B. twice the vector C. the null vector D. a unit vector E. its magnitude squared

973. The magnitude of the cross product of two vectors of magnitudes 2 and 3 units with 30 degrees between them is

A. 3 B. 6 C. 5.2 D. 1.5

974. A force of 5 N acts perpendicular to a spanner at a distance of 0.2 m from the pivot. The torque produced is

A. 25 N m B. 5 N m C. 10 N m D. 1 N m E. 0.04 N m

975. The projection of vector A along vector B is given by

A. A.B / |A| B. A.B C. A.B / |B| D. A x B E. |A| |B|

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