Mixed Practice

Free set

Showing 901 to 925 of 3046 questions (page 37 of 122).

901. For the reaction N2 + 3H2 giving 2NH3, increasing the pressure shifts the equilibrium

A. not at all B. to the left C. first left then right D. to the right E. towards the gas with higher molar mass

902. A catalyst added to a reversible reaction at equilibrium

A. does not change the position of equilibrium B. increases the value of Kc C. reduces the yield D. shifts the equilibrium to the left E. shifts the equilibrium to the right

903. The pH of a 0.001 mol dm-3 solution of hydrochloric acid is

A. 2 B. 4 C. 3 D. 11 E. 1

904. At 25 degrees Celsius, the sum of pH and pOH for an aqueous solution is

A. 1 B. 14 C. 7 D. 10

905. A buffer solution can be prepared from

A. two strong acids B. a strong base alone C. a strong acid and its salt D. a weak acid and its salt with a strong base E. a neutral salt alone

906. The solubility of a sparingly soluble salt decreases on adding a soluble salt with a common ion. This is called

A. the buffer effect B. Le Chatelier suppression of Ksp C. hydrolysis D. the salt bridge effect E. the common ion effect

907. Kc has no units when

A. a catalyst is used B. the reaction is at high pressure C. the reaction is irreversible D. the total number of moles of gaseous reactants equals that of products E. the reaction is exothermic

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

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

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

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

910. The molal boiling point elevation constant of water is

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

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

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

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

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

913. 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

914. The oxidation number of manganese in potassium permanganate is

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

915. 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

916. 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. 965 C E. 9650 C

917. In a galvanic cell, oxidation occurs at the

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

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

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

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

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

920. In an electrolytic cell, electrical energy is

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

921. The half life of a first order reaction

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

922. A catalyst increases the rate of reaction by

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

923. The order of a reaction is determined by

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

924. For a zero order reaction, the rate is

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

925. The Arrhenius equation relates the rate constant to

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

Previous 1 2 … 35 36 37 38 39 … 121 122 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans