Which of the following processes does not involve the use of limestone?
Extraction of iron in the blast furnance
Manufacture of tetraoxosulphate (VI) acid by Contact process
Production of washing soda by Solvay process
Production of cement
Correct answer is B
No explanation has been provided for this answer.
The following substances are ores of metals except
bauxite
cuprite
cassiterite
graphite
Correct answer is D
No explanation has been provided for this answer.
The reagent that can be used to distinguish ethene from ethyne is
ammoniacal silver trioxonitrate (V) solution
Benedict solution
bromine water
Fehling's solution
Correct answer is A
To distinguish between ethene and ethyne: i Add a few drops of ammonical copper(I) chloride to each of ethylene (ethene) and acetylene (ethyne). No change will be observed in the case of ethylene (ethene) but in the case of acetylene (ethyne), a red precipitate of copper acetylide is formed. similar result
ii) When ammoniacal Silver Nitrate (AgNO3) is added to Ethyne then it gives white precipitates. But when Ammoniacal silver nitrate is added to Ethene then no reaction occurs and no precipitates obtain.
The compound that makes palm wine taste sour after exposure to the air for few days is
ethanol
ethanoic acid
methanol
methanoic acid
Correct answer is A
No explanation has been provided for this answer.
When bromine is added to ethene at room temperature, the compound formed is
1,1 - dibromoethane
1,2 - dibromoethene
1,1 - dibromoethene
1,2 - dibromoethane
Correct answer is D
Ethene is an alkene, meaning it has a carbon to carbon double bond. When Bromine is added, an addition reaction occurs forming 1,2 dibromoethane.
C2H4 + Br2 -> C2H4Br2