Which of the following substance is an alloy of lead?
Brass
Duralumin
Stainless steel
Soft solder
Correct answer is D
No explanation has been provided for this answer.
Which of the following pairs of solutions will produce a precipitate when mixed?
Pb(NO3)2(aq) and NaCI(aq)
MgSO4(aq) and HCI(aq)
ZnCI2(aq) and NaSO4(aq)
NaOH(aq) and HNO3(aq)
Correct answer is A
\(Pb(NO_3)_{2(aq)} + 2NaCl → PbCl_2 + 2NaNO_3\) Option A will produce insoluble lead(II) chloride.( precipitate)
Hardness in water can be removed by adding
copper (ll) tetraoxosulphate (IV)
sodium trioxocarbonate (IV)
sodium chloride
alum
Correct answer is B
No explanation has been provided for this answer.
Ethyne undergoes the following reactions except
polymerisation
addition
substitution
esterification
Correct answer is D
No explanation has been provided for this answer.
hydrocarbons
alkanoates
alkanols
carbohydrates
Correct answer is B
No explanation has been provided for this answer.