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Showing 1551 to 1575 of 3046 questions (page 63 of 122).

1551. Raoult's law states that the partial vapour pressure of a component in a solution is proportional to its

A. mass B. molarity C. volume fraction D. molality E. mole fraction

1552. A mixture that distils at constant composition and cannot be separated further by fractional distillation is called

A. an azeotrope B. an emulsion C. a saturated solution D. an ideal solution E. a colloid

1553. An ideal solution is one in which

A. hydrogen bonding is formed on mixing B. the volume decreases on mixing C. the vapour pressure is zero D. the components react E. the enthalpy of mixing is zero and Raoult's law is obeyed

1554. The oxidation number of manganese in potassium permanganate is

A. +3 B. +4 C. +2 D. +7 E. +6

1555. The standard electrode potential of the standard hydrogen electrode is taken as

A. +1.00 V B. 0.00 V C. -0.76 V D. -1.00 V E. +0.76 V

1556. One faraday of charge is equal to about

A. 1.6 x 10^-19 C B. 6.02 x 10^23 C C. 96500 C D. 9650 C E. 965 C

1557. In a galvanic cell, oxidation occurs at the

A. anode B. porous partition C. cathode D. salt bridge E. electrolyte

1558. During the discharge of a lead accumulator, the substance formed at both electrodes is

A. hydrogen B. lead dioxide C. sulphuric acid D. lead E. lead sulphate

1559. A metal placed higher in the electrochemical series than another will

A. be reduced by it B. displace it from its salt solution C. not react with it D. form a stronger acid E. have a higher electrode potential

1560. In an electrolytic cell, electrical energy is

A. stored as heat only B. produced from a spontaneous reaction C. used to drive a non-spontaneous reaction D. converted into light only E. not involved

1561. The half life of a first order reaction

A. increases as the reaction proceeds B. is proportional to the rate constant C. doubles when concentration doubles D. is independent of the initial concentration E. depends on the initial concentration

1562. A catalyst increases the rate of reaction by

A. shifting the equilibrium B. increasing the concentration of reactants C. lowering the activation energy D. increasing the temperature E. increasing the enthalpy change

1563. The order of a reaction is determined by

A. the enthalpy change B. the molecularity C. the equilibrium constant D. experiment E. the stoichiometric equation

1564. For a zero order reaction, the rate is

A. inversely proportional to concentration B. independent of the concentration of the reactant C. zero at all times D. proportional to the concentration of the reactant E. proportional to the square of the concentration

1565. The Arrhenius equation relates the rate constant to

A. enthalpy and entropy B. concentration and volume C. pH and temperature D. pressure and volume E. temperature and activation energy

1566. Enzyme catalysed reactions are highly

A. specific B. independent of pH C. irreversible at all temperatures D. endothermic E. non-specific

1567. The modern periodic law states that the properties of elements are a periodic function of their

A. valency B. atomic volume C. atomic number D. atomic mass E. density

1568. Across a period from left to right, atomic radius generally

A. increases then decreases B. decreases C. remains constant D. increases E. doubles

1569. Ionization energy generally decreases

A. with increasing nuclear charge B. with decreasing atomic size C. for half filled subshells D. down a group E. across a period

1570. Lithium shows a diagonal relationship with

A. beryllium B. aluminium C. sodium D. calcium E. magnesium

1571. Hydration energy of an ion increases with

A. increasing charge density B. increasing ionic size C. decreasing charge D. decreasing charge density E. increasing atomic mass

1572. The flame colour given by potassium compounds is

A. golden yellow B. apple green C. crimson D. brick red E. lilac

1573. The chemical formula of plaster of Paris is

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

1574. In the Solvay process, the raw materials used are

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

1575. Lime water turns milky on passing carbon dioxide because of the formation of

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

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