ABU Chemistry 2014/2015 Past Questions

Practice each question, then open it to see the full details.

Natural water include the following except

A.Rain water
B.Spring water
C.pure water
D.Lake water

Which of the following methods cannot be used to remove permanent hardness from water?

A.Adding of washing oda
B.addition of caustic soda
C.perubt method
D.adding alum to water

If the solubility or sodium tetraoxosulphte(iv) at 30°C is 100g. How much is this gram per kilogram?

A.18g per 100g
B.180g per 100g
C.180g per 1000g
D.180g per mg

The following are examples of colloid except

A.Milk
B.Starch in water
C.aerosol
D.ammonium chloride solution

The pH of the solution M,N,O and P are 4,6,8 and 10 respectively. Therefore

A.non of the solution is acidic
B.the ph of the O made neautral by adding water
C.the most acidic solution is P
D.M is the most acidic solution

Sodium chloride may be obtained from brine by

A.detection
B.distillation
C.evaporation
D.sublimation

Oil spillage in pond and creek can be cleared by

A.Burning of the oil layer
B.spraying with detergent
C.spraying with common salt
D.spraying with oil

Which of the following is a chemical compound?

A.Soap
B.milk
C.urine
D.gold

Crystallization is a separation method used

A.where purity of the product is important
B.where beauty of the product is important
C.where the product is a solid
D.where the product cannot be destroyed by heat

Which hydroxide dissolves in water to form an alkaline

A.Aluminium hydroxide
B.Calcium hydroxide
C.Copper hydroxide
D.iron hydroxide