How many orbitals are in the d-sub shell?
1
3
5
7
Correct answer is C
No explanation has been provided for this answer.
In which of the following processes is biotechnology not applied?
Manufacture of drugs
Treatment of domestic sewage
Production of alcoholic beverages
Electroplating of metals
Correct answer is D
No explanation has been provided for this answer.
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(NO3)2(aq)+2NaCl→PbCl2+2NaNO3 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.