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Showing 451 to 475 of 3046 questions (page 19 of 122).

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

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

452. One faraday of charge is equal to about

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

453. In a galvanic cell, oxidation occurs at the

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

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

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

455. 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

456. In an electrolytic cell, electrical energy is

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

457. The half life of a first order reaction

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

458. A catalyst increases the rate of reaction by

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

459. The order of a reaction is determined by

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

460. For a zero order reaction, the rate is

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

461. The Arrhenius equation relates the rate constant to

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

462. Enzyme catalysed reactions are highly

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

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

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

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

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

465. Ionization energy generally decreases

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

466. Lithium shows a diagonal relationship with

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

467. Hydration energy of an ion increases with

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

468. The flame colour given by potassium compounds is

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

469. The chemical formula of plaster of Paris is

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

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

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

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

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

472. Boron trifluoride acts as a Lewis acid because boron

A. has a lone pair B. has an incomplete octet C. is highly electronegative D. forms hydrogen bonds E. is a metal

473. Aluminium oxide is described as amphoteric because it reacts with

A. acids only B. bases only C. both acids and bases D. neither acids nor bases E. water only

474. The reluctance of the ns2 electrons to take part in bonding in heavier p-block elements is called

A. the shielding effect B. the inert pair effect C. the lanthanide contraction D. the diagonal relationship E. hyperconjugation

475. The strongest oxidizing agent among the halogens is

A. fluorine B. chlorine C. bromine D. iodine E. astatine

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