Chemistry Past Questions and Answers

Which of the following gases can best be used for demonstrating the fountain experiment? i) Nitrogen (ii) Ammonia (iii) Nitrogen (I) oxide (iv) Hydrogen chloride.

A Ii and iii
B I and iii
C Ii and iv
D Ii only

Question 492:

When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?

A Bubbling it through concentrated H2SO2
B Bubbling it through water and then passing it through calcium oxide
C Passing it directly through calcium oxide
D Passing it directly through calcium chloride

Question 493:

Which of the following elements will form oxide which will dissolve both in dilute HNO3 and NaOH solutions to form salts?

A Al
B Mg
C Ag
D Mn

Question 494:

Stainless steel is an alloy of?

A Iron, carbon and silver
B Iron, carbon and lead
C Iron, carbon and chromium
D Iron and carbon only

Question 495:

Alloys are best prepared by?

A High temperature weilding of the metals
B Electrolysis using the major metallic component as cathode
C Reducing a mixture of the oxies of the elements
D Cooling a molten mixture of the necessary elements