Chemistry Past Questions and Answers

Which of the following statements is NOT true of electrovalent compounds?

A They are solids
B They do not vaporized easily
C They usually dissolve in water
D The elements forming the compounds normally have their valency electrons in a shared state
E They conduct electricity

Question 217:

If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?

A A drying agent
B An oxidizing agent
C A dehydrated agent
D A reducing agent
E A hydrolysing agent

Question 218:

In the reaction C + 2HNO3 â†’ CO2 + NO2 + NO + H2O nitric acid is acting as?

A A reducing agent
B A nitrating agent
C An oxidizing agent
D A catalytic agent
E A neutralizing agent

Question 219:

The brown coloration in nitric acid prepared in the laboratory can be removed by?

A Heating the acid
B Bubbling air through the acid
C Cooling the acid
D Adding a decolorizing agent
E Adding a base

Question 220:

Which of the following processes takes place during electrolysis?

A Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral
B Negative ions are dicharged at the anode by gaining suficient electrons to become neutral
C Positive ions are discharged at the anode by losing sufficient electrons to become neutral
D Negative ions are discharge at the anode by losing sufficient electrons to become neutral
E Nothing happens