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Showing 401 to 425 of 3046 questions (page 17 of 122).

401. Solvent extraction is governed by the

A. law of mass action B. distribution law C. law of definite proportions D. Hess's law E. Raoult's law

402. A good solvent for crystallization should

A. dissolve the solute equally well hot and cold B. dissolve the solute more when hot than when cold C. react with the solute D. have a very high boiling point only E. dissolve the impurities only when cold

403. Boyle's law states that at constant temperature the volume of a given mass of gas is

A. directly proportional to pressure B. inversely proportional to pressure C. independent of pressure D. proportional to the square of pressure E. proportional to temperature

404. Extrapolation of the volume against temperature graph for a gas gives absolute zero at

A. 0 degrees Celsius B. -100 degrees Celsius C. -273.16 degrees Celsius D. -373 degrees Celsius E. 100 degrees Celsius

405. The value of the gas constant R in dm3 atm mol-1 K-1 is

A. 8.314 B. 0.0821 C. 1.987 D. 62.4 E. 0.083

406. According to Graham's law, the rate of diffusion of a gas is

A. proportional to its molar mass B. proportional to the square of its molar mass C. inversely proportional to the square root of its molar mass D. independent of molar mass E. proportional to the square root of its molar mass

407. In the van der Waals equation, the constant b accounts for

A. intermolecular attraction B. the volume occupied by the gas molecules C. the kinetic energy of the molecules D. the temperature correction E. the number of moles

408. A gas cannot be liquefied by pressure alone above its

A. boiling point B. melting point C. critical temperature D. inversion temperature E. transition temperature

409. The average kinetic energy of gas molecules is directly proportional to

A. pressure B. volume C. absolute temperature D. molar mass E. density

410. Dalton's law of partial pressures does not apply to gases that

A. are monatomic B. have different molar masses C. react chemically with each other D. are at high temperature E. are at low pressure

411. The abnormally high boiling point of water compared with hydrogen sulphide is due to

A. its low molar mass B. hydrogen bonding C. London dispersion forces D. its ionic character E. covalent network bonding

412. The boiling point of a liquid at reduced external pressure

A. increases B. decreases C. remains unchanged D. becomes zero E. doubles

413. The coordination number of each ion in a sodium chloride crystal is

A. 4 B. 6 C. 8 D. 12 E. 2

414. The existence of a substance in more than one crystalline form is called

A. isomorphism B. polymorphism C. isotopy D. allotropy in solutions only E. anisotropy

415. Which type of solid has the highest melting point?

A. molecular B. ionic C. metallic D. covalent network E. amorphous

416. The maximum number of electrons that can occupy the shell with n = 3 is

A. 8 B. 10 C. 18 D. 32 E. 6

417. For an electron in a 3d orbital, the azimuthal quantum number l is

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

418. The ground state electronic configuration of chromium (Z = 24) is

A. [Ar] 3d4 4s2 B. [Ar] 3d5 4s1 C. [Ar] 3d6 D. [Ar] 4s2 4p4 E. [Ar] 3d3 4s3

419. Rutherford's gold foil experiment established the existence of

A. the electron B. the neutron C. a small dense positively charged nucleus D. energy levels E. orbitals

420. The energy of a photon of frequency nu is given by

A. h/nu B. h nu C. nu/h D. h nu2 E. h/nu2

421. The shape of a p orbital is

A. spherical B. dumb bell C. double dumb bell D. tetrahedral E. planar triangular

422. Hund's rule requires that

A. electrons pair up before occupying empty degenerate orbitals B. degenerate orbitals are singly occupied with parallel spins before pairing C. the lowest energy orbital is filled last D. no two electrons can have the same spin E. d orbitals fill before s orbitals of the same shell

423. The bond angle in a molecule with sp3 hybridization and no lone pairs is

A. 90 degrees B. 104.5 degrees C. 107 degrees D. 109.5 degrees E. 120 degrees

424. The dipole moment of carbon dioxide is zero because the molecule is

A. non-polar in its bonds B. linear and symmetrical C. angular D. tetrahedral E. ionic

425. The shape of the ammonia molecule according to VSEPR theory is

A. trigonal planar B. tetrahedral C. trigonal pyramidal D. linear E. bent with 104.5 degrees

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