Back to MCQ Bank

Chemistry

Free set

Showing 1026 to 1050 of 1398 questions (page 42 of 56).

1026. The lattice energy of an ionic compound is determined indirectly using the

A. Carnot cycle B. Haber process C. Born Haber cycle D. Kelvin scale E. Hess cycle for combustion only

1027. A system that can exchange energy but not matter with its surroundings is called

A. an isolated system B. a closed system C. a homogeneous system D. an open system E. an adiabatic system only

1028. For the reaction N2 + 3H2 giving 2NH3, increasing the pressure shifts the equilibrium

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

1029. A catalyst added to a reversible reaction at equilibrium

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

1030. The pH of a 0.001 mol dm-3 solution of hydrochloric acid is

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

1031. At 25 degrees Celsius, the sum of pH and pOH for an aqueous solution is

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

1032. 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

1033. 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. hydrolysis C. the salt bridge effect D. Le Chatelier suppression of Ksp E. the common ion effect

1034. Kc has no units when

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

1035. 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

1036. 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

1037. 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

1038. 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

1039. 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

1040. 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

1041. The oxidation number of manganese in potassium permanganate is

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

1042. 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

1043. 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

1044. In a galvanic cell, oxidation occurs at the

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

1045. 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

1046. 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

1047. 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

1048. 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

1049. 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

1050. 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

Previous 1 2 … 40 41 42 43 44 … 55 56 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans