chemistry: exp. Test 2023

written by gogorabei | June 19, 2023

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#1. 16)The furnaces that change iron III oxide to an alloy of Iron and Carbon respectively are …………..

a)Open furnace then Medrix furnace

a)Open furnace then Medrix furnace

b)Oxygen convertor then the blast furnace

b)Oxygen convertor then the blast furnace

c)Blast furnace then Medrix furnace.

c)Blast furnace then Medrix furnace.

d)Blast furnace then open furnace

d)Blast furnace then open furnace

#2. 18)During operation of fuel cell. Which one of the following choices is correct ?

a)Concentration of electrolyte remains constant

a)Concentration of electrolyte remains constant

b)Decreasing the concentration of electrolyte

b)Decreasing the concentration of electrolyte

c)Decreasing the value of pH of electrolyte

c)Decreasing the value of pH of electrolyte

d)Increasing the value of pH of electrolyte

d)Increasing the value of pH of electrolyte

#3. 20)On adding diluted hydrochloric acid to two different salts individually, two gases evolve that can be oxidized, So the salts are ………..

a)K2S2O3 – KHCO3

a)K2S2O3 – KHCO3

b)K2S – KNO2

b)K2S – KNO2

c)K2CO3 – KNO2

c)K2CO3 – KNO2

d)K2SO3 – KNO2

d)K2SO3 – KNO2