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Showing 2326 to 2350 of 3046 questions (page 94 of 122).

2326. Molality is defined as the number of moles of solute per

A. cubic decimetre of solution B. litre of solvent C. kilogram of solvent D. kilogram of solution E. mole of solvent

2327. Which of the following is not a colligative property?

A. elevation of boiling point B. refractive index C. lowering of vapour pressure D. depression of freezing point E. osmotic pressure

2328. The molal boiling point elevation constant of water is

A. 0.52 K kg mol-1 B. 1.86 K kg mol-1 C. 0.86 K kg mol-1 D. 5.12 K kg mol-1 E. 2.53 K kg mol-1

2329. Raoult's law states that the partial vapour pressure of a component in a solution is proportional to its

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

2330. 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 colloid D. an ideal solution E. a saturated solution

2331. An ideal solution is one in which

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

2332. The oxidation number of manganese in potassium permanganate is

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

2333. The standard electrode potential of the standard hydrogen electrode is taken as

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

2334. One faraday of charge is equal to about

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

2335. In a galvanic cell, oxidation occurs at the

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

2336. During the discharge of a lead accumulator, the substance formed at both electrodes is

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

2337. 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. have a higher electrode potential E. form a stronger acid

2338. In an electrolytic cell, electrical energy is

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

2339. The half life of a first order reaction

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

2340. A catalyst increases the rate of reaction by

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

2341. 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

2342. For a zero order reaction, the rate is

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

2343. The Arrhenius equation relates the rate constant to

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

2344. Enzyme catalysed reactions are highly

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

2345. The modern periodic law states that the properties of elements are a periodic function of their

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

2346. Across a period from left to right, atomic radius generally

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

2347. Ionization energy generally decreases

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

2348. Lithium shows a diagonal relationship with

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

2349. Hydration energy of an ion increases with

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

2350. The flame colour given by potassium compounds is

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

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