2 Which factor has no effect on enzyme activity? A pH B Temperature C Substrate concentration D Color of enzyme
3 The reaction of carboxylic acids with bases is called: A Esterification B Neutralization C Oxidation D Reduction
4 Which property of alcohols makes them useful as disinfectants? A High melting point B Ability to kill microbes C Sweet taste D Insolubility in water
6 Which bacteria are responsible for conversion of ethanol into vinegar? A Lactobacillus B Acetobacter C Rhizobium D E. coli
7 Bacterial oxidation of ethanol produces: A Methanoic acid B Ethanoic acid C Propanoic acid D Butanoic acid
9 The law of conservation of mass states that mass is: A Created B Destroyed C Neither created nor destroyed D Always increased
10 An increase in temperature generally causes the reaction rate to: A Decrease B Remain constant C Increase D Stop
14 A fuel cell produces electricity by: A Burning fuel directly B Electrochemical reaction C Nuclear reaction D Photosynthesis
15 Activation energy is defined as: A Energy released during reaction B Minimum energy required for reaction C Energy of products D Total energy of reactants
16 The reactivity series helps in predicting: A Atomic mass B Metal displacement reactions C Color of metals D Density of metals
19 A physical change is one in which: A New substance is formed B Mass is destroyed C No new substance is formed D Energy is released only