The function of limestone in the extraction of iron in the blast furnace is
removal of the earthly impurities
decomposition of the iron ore
conversion of iron (lll) to iron (ll) compounds
generation of heat for the process
conversion of coke to carbon(ll)oxide
Correct answer is A
No explanation has been provided for this answer.
Which of the following is an alloy of mercury?
Stainless steel
Soft solder
Coinage bronze
Amalgam
Duralumin
Correct answer is D
No explanation has been provided for this answer.
The following alkanols will yield alkanoic acids on reacting with excess acidified K2Cr2O7 except
CH3CH2OH
(CH3)2CHCH2OH
(CH3)3CCH2OH
(CH3)3COH
CH3CH2CH2CH2OH
Correct answer is D
option D is a tertiary alkanol. tertiary alkanols are resistant to oxidation so cannot react with excess acidified \(K_2Cr_2O_7\) to give any product.
In which of the following processes are larger molecules broken down into smaller molecules?
Vulcanization of rubber
Hydrogenation of palm oil
Hydrolysis of starch
Polymerization
Esterification
Correct answer is C
No explanation has been provided for this answer.
The gas produced when a mixture of sodium propanoate and soda lime is heated is
methane
pentane
ethane
butene
ethyne
Correct answer is C
So during the presence of methane, sodium ethanoate with soda lime is used, using sodium propanoate with sodium will produce ethane according to the equation below
\(\CH_3CH_2COONa + NaOH → C_2H_6 + Na_2CO_3\)\