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Showing 1501 to 1525 of 3046 questions (page 61 of 122).

1501. Isotopes of an element are separated on the basis of

A. chemical reactivity B. boiling point of the compound C. difference in colour D. difference in charge only E. difference in mass

1502. A fluted filter paper is used in filtration to

A. increase the surface area available for filtration B. dry the precipitate C. remove coloured impurities D. reduce the pore size E. neutralize the filtrate

1503. Which pair of substances can be purified by sublimation?

A. glucose and urea B. sodium chloride and sugar C. iodine and naphthalene D. ethanol and water E. copper sulphate and alum

1504. In paper chromatography, the Rf value of a component is always

A. greater than 1 B. independent of the solvent C. negative D. equal to 1 E. less than or equal to 1

1505. Solvent extraction is governed by the

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

1506. A good solvent for crystallization should

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

1507. Boyle's law states that at constant temperature the volume of a given mass of gas is

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

1508. Extrapolation of the volume against temperature graph for a gas gives absolute zero at

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

1509. The value of the gas constant R in dm3 atm mol-1 K-1 is

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

1510. According to Graham's law, the rate of diffusion of a gas is

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

1511. In the van der Waals equation, the constant b accounts for

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

1512. A gas cannot be liquefied by pressure alone above its

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

1513. The average kinetic energy of gas molecules is directly proportional to

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

1514. Dalton's law of partial pressures does not apply to gases that

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

1515. The abnormally high boiling point of water compared with hydrogen sulphide is due to

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

1516. The boiling point of a liquid at reduced external pressure

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

1517. The coordination number of each ion in a sodium chloride crystal is

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

1518. The existence of a substance in more than one crystalline form is called

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

1519. Which type of solid has the highest melting point?

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

1520. The maximum number of electrons that can occupy the shell with n = 3 is

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

1521. For an electron in a 3d orbital, the azimuthal quantum number l is

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

1522. The ground state electronic configuration of chromium (Z = 24) is

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

1523. Rutherford's gold foil experiment established the existence of

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

1524. The energy of a photon of frequency nu is given by

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

1525. The shape of a p orbital is

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

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