Back to MCQ Bank

Chemistry

Free set

Showing 1201 to 1225 of 1398 questions (page 49 of 56).

1201. A Buchner funnel with a filter flask is used for

A. sublimation B. distillation C. crystallization D. titration E. filtration under suction

1202. The solution left after crystals have separated out during crystallization is called the

A. mother liquor B. eluent C. filtrate only D. supernatant gas E. distillate

1203. In thin layer chromatography, the stationary phase is supported on

A. a filter funnel B. a column of solvent C. a glass or plastic plate D. a strip of paper E. a metal wire

1204. A gas occupies 2 dm3 at 1 atm. At constant temperature and 4 atm its volume becomes

A. 1 dm3 B. 8 dm3 C. 4 dm3 D. 0.5 dm3 E. 2 dm3

1205. A gas occupying 273 cm3 at 273 K is heated at constant pressure to 546 K. Its new volume is

A. 136 cm3 B. 409 cm3 C. 273 cm3 D. 1092 cm3 E. 546 cm3

1206. Standard temperature and pressure are defined as

A. 273 K and 760 mm of mercury only at the equator B. 0 K and zero pressure C. 298 K and 1 atm D. 373 K and 1 atm E. 273.15 K and 1 atm

1207. The volume occupied by 0.5 mol of any ideal gas at STP is

A. 22.4 dm3 B. 11.2 dm3 C. 2.24 dm3 D. 44.8 dm3 E. 5.6 dm3

1208. A hydrogen bond is typically

A. weaker than a covalent bond but stronger than a London force B. weaker than a London dispersion force C. of zero energy D. stronger than a covalent bond E. identical to an ionic bond

1209. Ice floats on water because

A. water is denser at 0 degrees Celsius than at 4 degrees Celsius B. it contains dissolved air only C. hydrogen bonding gives ice an open structure of lower density D. ice is amorphous E. it is warmer

1210. Molecular solids are generally

A. good conductors of electricity B. hard with high melting points C. soft with low melting points D. network covalent E. ionic in character

1211. Ionic solids conduct electricity

A. only when molten or dissolved B. only as vapours C. in the solid state D. only at absolute zero E. never

1212. Cleavage of a crystal along definite planes shows that

A. the crystal contains water B. the crystal is ionic C. the crystal is amorphous D. the particles are arranged in an ordered pattern E. the crystal is anisotropic in colour only

1213. The three isotopes of hydrogen are

A. hydride, proton and hydronium B. protium, deuterium and tritium C. ortho, meta and para hydrogen D. alpha, beta and gamma hydrogen E. hydrogen, helium and lithium

1214. The maximum number of electrons that a d subshell can hold is

A. 10 B. 2 C. 18 D. 6 E. 14

1215. The wave mechanical model of the atom is based on the equation formulated by

A. Bohr B. Rutherford C. Schrodinger D. Chadwick E. Planck

1216. The existence of discrete spectral lines rather than a continuous spectrum shows that atomic energy is

A. continuous B. quantized C. zero D. independent of the electron E. infinite

1217. The number of lone pairs on the oxygen atom in a water molecule is

A. 3 C. 4 D. 1 E. 2

1218. The shape of the phosphorus pentachloride molecule is

A. tetrahedral B. see saw C. trigonal bipyramidal D. square planar E. octahedral

1219. The number of sigma bonds in an ethyne molecule is

A. 4 B. 3 C. 1 D. 2 E. 5

1220. The number of pi bonds in a benzene molecule, on the Kekule representation, is

A. 3 B. 2 C. 6 D. 1

1221. The specific heat capacity of water is about

A. 1.0 J g-1 K-1 B. 4.18 J g-1 K-1 C. 2.09 J g-1 K-1 D. 336 J g-1 K-1 E. 8.314 J g-1 K-1

1222. The dissolution of ammonium chloride in water lowers the temperature, so the process is

A. endothermic B. exothermic C. isothermal D. spontaneous only above 100 degrees Celsius E. adiabatic

1223. The imaginary surface separating a system from its surroundings is called the

A. phase B. meniscus C. medium D. interface E. boundary

1224. Enthalpy changes of reaction are normally quoted in

A. kJ K-1 B. J K-1 mol-1 C. kJ mol-1 D. J E. mol kJ-1

1225. The enthalpy of formation of a compound can be found from enthalpies of combustion using

A. Raoult's law B. Le Chatelier's principle C. Graham's law D. Hess's law E. Dalton's law

Previous 1 2 … 47 48 49 50 51 … 55 56 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans