1. The movement of liquid from the surface of the liquid to the gaseous phase...

1. The movement of liquid from the surface of the liquid to the gaseous phase above it is known as
a. Brownian movement
b. Condensation
c. Evaporation
d. Liquefaction

2. When 50cm^3 of a saturated solution of sugar (molar mass 342.0g) at 40*C was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40*C is
a. 10.0 moles dm^-3
b. 7.0 moles dm^-3
c. 3.0 moles dm^-3
d. 2.0 moles dm^-3

3. Whish of the following is an acid salt?
a. NaHSO4
b. NaSO4
c. CH2CO2Na
d. Na2S

4. How many electrons are trasnsferred in reducing one atom of Mn in the reaction MnO2 + 4HCl --------> MnCl2 + 2H2O + Cl2
a. 2
b. 3
c. 4
d. 5

5. What is the consequence of increasing pressure in the equilibrium reaction ZnO ------> Zn + H2O
a. The equilibrium is driven to the left
b. The equilibrium is driven to the right
c. There is no effect
d. More ZnO is produced

6. Which of the following substances is a mixture ?
a. Granulated sugar
b. Sea-water
c. Sodium chloride
d. Iron fillings

7. An element Z, contained 90% of (16,8)Z and 10% of (18,8)Z , its relative atomic mass is
a. 16.0
b. 16.2
c. 17.0
d. 17.8

8. Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the
a. Acid
b. Ester of alkanoic acid
c. Alkali
d. Alkanol

9. Complete oxidation of propan-1-ol gives
a. Propanal
b. Propan-2-al
c. Propan-1-one
d. Propanoic acid

10. When water drops are added to calcium carbide in a container and the gas produced through a jet and lighted, the resultant flame is called an
a. Oxyethlene flame
b. Oxyhydro-carbon flame
c. Oxyacetylene flame
d. Oxymethane flame

11. Which of the following statements is TRUE?
a. The dissolution of NaOH in water is endothermic
b. The heat of solution of NaOH is positive
c. The NaOH gains heat from the surroundings
d. The heat of solution of NaOH is negative

12. What volume of a 0.1M H3PO4 will be required to neutralize 45.0cm^3 of a 0.2M NaOH?
a. 10.0 cm^3
b. 20.0 cm^3
c. 27.0 cm^3
d. 30.0 cm^3

13. The diagram below shows the reaction path of an exothemic reaction.

14. 20.00 cm^3 of a solution containing 0.53g of anhydrous Na2CO3 in 100 cm^3 requires 25.00 cm^3 of H2SO4 for complete neutralization . the concentration of the acid solution in moles per dm^3 is? [ H=1, C=12, O=16, NA=23, S=32 ]
a. 0.02 cm^3
b. 0.04 cm^3
c. 0.06 cm^3
d. 0.08 cm^3

15. The substance ZnO dissolves in sodium hydrocide solution and mineral acid solution to give soluble products in each case. ZnO is therefore referred to as?
a. An allotropic oxide
b. An amphoteric oxide
c. A peroxide
d. A dioxide

16. Which of the samples will react fastest with dilute triozonitrateV acid?
a. 5g of lumps of CaCO3 at 25*C
b. 5g of powdered CaCO3 at 25*C
c. 5g of lumps of CaCO3 at 50*C
d. 5g of powdered CaCO3 at 50*C

17. In the Haber process for the manufacture of ammonia, the catalyst commonly used in finely divided
a. Vanadium
b. Platinum
c. Iron
d. Copper

18. The brown fumes given off when trioxonitrate v acid is heated consist of
a. NO2 and O2
b. H2O and NO2
c. NO2, O2 and H2O
d. NO, NO2 and H2O

19. A blue solid, T which weighed 5.0g was placed on a table. After 8 hours, the resulting pin solid was found to weigh 5.5g. it can be inferred that substance T.
a. Is deliquescent
b. Is hygroscopic
c. Has some molecules of water of crystallization
d. Is efflorescent

20. In the reaction SnO2 + 2C ----> Sn + 2CO, the mass of coke containing 80% carbon required to reduce 0.302kg of pure tin oxide is? [ Sn=119, O=16, C=12 ]
a. 40kg
b. 0.20kg
c. 0.06kg
d. 0.04kg

21. Which of the following are mixtures ? I. Petroleum II. Rubber latex III. Vulcanizer’s solution IV. Carbon(ii)sulphide?

2 Answers Available
Asked by Printess on 23rd March, 2023