which one of the following processes is used in the conversion of oil to fat?

a.saponification

b.dehydration

c.hydrogenation

d.polymerisation

which one of the following substances when mixed with water conduct electricity?

a.kerosene

b.hydrogen chloride

c.glucose

d.carbon tetrachloride

which one of the following alloys can be used for make surgical blades?

a.brass

b.bronze

c.solder

d.steel

a mixture of iron and sulphur was heated. which one of the following is true about the product?

a.the product is soluble in water

b.the product reacts with acids to produce hydrogen sulphide

C.the product reacts with acids to produce hydrogen

d.the composition of the products can be separated using a magnet

which one of the following processes increases the amount of nitrogen in the atmosphere?

a.photosynthesis

b.haber process

c.respiration

d.denitrification

which one of the following zinc solutes is an insoluble salt?

a.ZnCO ₃

b.ZnSO ₄

C.ZnCl ₂

d.Zn(NO ₃) ₂

the similarly between sulphur dioxide and carbon dioxide is that both

a.are reducing agents

b.turn lime water milky

c.dissolve in water to form acids

d.turn potassium dichromate solution green

which one of the following is used as a catalyst during laboratory preparation of oxygen?

a.iron

b.platinum

c.magnesium(IV) oxide

d. vanadium(V) oxide

which one of the following acids, when in a dilute solution have a pH of about 1?

a.citric acid

b.ethanoic acid

c.carbonic acid

d.hydrochloric acid

which one of the following statements is true about equal volumes of oxygen and carbon dioxide under the same temperature and pressure. the two gases

a. have equal number of molecules

b.have equal masses

c.have equal density

d.move at the same speed

the atomic number of element Z is 12. what is the atomic number of element W which is immediately below Z in the same group of the periodic table

a. 14

b. 11

c. 13

d. 20

which one of the following gases is produced when iron(II) sulphide is treated with dilute hydrochloric acid

a. hydrogen chloride

b. sulphur dioxide

c.hydrogen sulphide

d.chlorine

lead(II) nitrate solution reacted with a colourless solution Q to form a yellow participate

which one of the following is the anion of Q?

a.L^-

b. Cl^-

c.SO₄^2-

d.CO₃^2-

the full symbol of the atom of an element X is ²⁷₁₃X

what is the number of neutrons in the atom X?

a.13

b.14

c.27

d.40