Practice Test


1) The law of mass action was proposed by


2) Which of the following factors influence a chemical system in accordance with the Le-Chaterlier' principle?


3) Chemical reaction which proceeds only in one direction is called a/an


4) When a reversible reaction acquires the equilibrium state,


5) The rate at which a substance undergoes reaction is proportional to


6) Which one of the following satements is correct?


7) A reversible reaction is said to have attained equilibrium when


8) Small value of equilibrium constant show that


9) At a constant temperature, if a small amount of one of the products is removed, the equilibrium constant


10) The active mass of a solid in heterogeneous equilibrium is taken as


11) Le-Chatelier principle is applicable to


12) The equilibrium constant in a reversible chemical reaction at a given temperature


13) Which one of the following informations can be obtained on the basis of Le-Chatelier principle?


14) The active mass of 64g of HI in a two litre flask would be


15) The numerical value of equilibrium constant is affected by changing


16) The chemical equilibrium is the state of chemical reaction at which


17) Mathematical expression obtained by applying law of mass action to chemically reversible reaction is called


18) Molar concentration per unit volume is called


19) In an irreversible reaction


20) Chemical reaction in which reactants react to form products and the products formed react with each other directly to form the original reactants back is known as _______ reaction


21) A reaction in which heat is absorbed is called as an _______ reaction.


22) A homogeneous reaction is one which occurs only in________ phase


23) If the temperature is kept constant, the reaction which is accompanied by a decrease in volume will be favoured by increasing


24) At a given pressure an endothermic reaction is favoured by increasing


25) The ______ states that "In a homogeneous system at constant temperature the rate at which a substance reacts is proportional to its active mass and rate of a chemical reaction is proportional to the product of active masses of the reacting substances at that moment".


26) According to Bronsted-Lowry concept a base is a substance that


27) According to Lewis concept an acid is a substance which


28) NaCl is a salt of


29) pH of an acidic solution is


30) Buffer solution is the solution which has


31) The degree of dissociation of a weak electrolyte in aqueous solution


32) Solutions with reserved acidity or alkalinity are known as


33) The theory of ionization was put forward by


34) A conjugate acid differs from its conjugate base by


35) Precipitation takes place when the ionic product


36) A buffer solution is a solution whose pH value on keeping in the air


37) An aqueous solution of aluminium sulphate would show


38) The acidic buffer solution can be prepared by mixing solutions of


39) The concept that acid is proton donor and base is proton acceptor was given by


40) Calculate the percent ionisation of 0.05M acetic acid


41) The active mass is denoted by using the symbol


42) The pH of a solution of sodium acetate will be


43) Which of the following is an irreversible reaction?


44) If ammonia is added to pure water, the concentration of a chemical species already present will decrease. This species is


45) A example of a reversible reaction is


46) Which of the following statements is correct about equilibrium constant?


47) Le - Chatelier principle is not applicable to


48) In the reaction, when there is no change in volume


49) According to the Arrhenius concept base is a substance that


50) Which one of the following is the weakest base?


51) A mixture of a weak acid (say acetic acid) and its salts with a strong base (say sodium acetate) acts as a buffer solution. Which other pair of substances from the following may have similar properties?


52) Which of the following is a Lewis base?


53) Ionic product of water is


54) Hydrogen ion concentration of neutral solution is


55) Hydroxyl ion concentration of a neutral solution is


56) pH of solution is defined as


57) The hydroxyl ion concentration in a solution having pH 4 will be


58) The unit of solubility is


59) Which of the following substances on dissolving in water will give a basic solution?


60) For the salt of weak acid and strong base,the hydrolysis constant is given by the expression


61) A 0.2 molar solution of formic acid is 3.2% ionizes. Its ionization constant is


62) The pH of 1.0 M aqueous solution of a weak acid HA is 6.0.Its dissociation constant is


63) A 0.2 M solution of methanoic acid has degree of ionisation 0.032. Its dissociation constant would be


64) Which of the following pairs will form a buffer


65) Which one of the following is a stronger base?