When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?
- A. HCl
- B. HOCl
- C. O2
- D. Cl2O
Which of the following sulphides is insoluble in dilute HCl?
- A. Na2S
- B. ZnS
- C. CuS
- D. FeS
Which of the following metals does NOT form a stable trioxocarbonate (IV)?
- A. Fe
- B. Al
- C. Zn
- D. Pb
- E. none of the options is correct
In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?
- A. H and S;Cl
- B. H and O;Cl
- C. H and S;C and O
- D. H and Cl;S and O
Which of the following will react further with oxygen to form higher oxide?
- A. NO and H2O
- B. CO and CO2
- C. SO2 and NO
- D. CO2 and H2O
Oxygen-demanding waste are considered to be a water pollutant because they?
- A. deplete oxygen which is necessary for the survival of aquatic organism
- B. increase oxygen which is necessary for survival of aquatic organism
- C. increase other gaseous substances which are necessary for the survival of aquatic organisms
- D. deplete other gaseous species which is necessary for the survival of aquatic organisms
The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?
- A. CO and SO3
- B. CO and SO2
- C. CO,SO2 and SO3
- D. CO and H2S
When steam is passed through red hot carbon, which of the following are produced?
- A. Hydrogen oxygen and carbon (IV) oxide
- B. Hydrogen and carbon (IV) oxide
- C. Hydrogen and carbon (II) oxide
- D. Hydrogen and trioxocarbonate (IV) acid
The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
- A. excess Mg ribbon
- B. excess cold water
- C. very hot water
- D. steam
The approximate volume of air containing 10cm3 of oxygen is?
- A. 20 cm3
- B. 25 cm3
- C. 50 cm3
- D. 100 cm3
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?
- 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
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
- A. -51.O KJ mol-
- B. +57.3 KJ mol-
- C. +57.O KJ mol-
- D. +51.0 KJ mol-
Which of these represents a redox reaction?
- A. AgNO3 + NaCl → AgCAl + NaNO3
- B. H2S + Pb(NO3) → PbS + 2HNO3
- C. CaCO3 → CaO + CO2
- D. Zn + 2HCl → ZnCl2 + H2
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
- A. 3.90 x 102 coulombs
- B. 5.50 x 103 coulombs
- C. 6.54 x 103 coulombs
- D. 2.34 x 104 coulombs
Which of the following solutions will conduct the least amount of electricity?
- A. 2.00 M aqueous solution of NaOH
- B. 0.01 M aqueous solution of NaOH
- C. 0.01 M aqueous solution of hexanoic acid
- D. 0.01 M aqueous solution of sugar
Which of the following is an acidic salt?
- A. NaHSO4
- B. Na2SO4
- C. CH3CO2Na
- D. Na2S
Which of the following salts when dissolved in water will NOT give the corresponding pH value?
- A. NaHSO4, pH < 5
- B. Na2CO3, pH > 8
- C. Na2Cl,pH = 7
- D. NaHCO, pH < 6
The function of sulphur during vulcanization rubber is to?
- A. act as catalyst for the polymerization of rubber molecules
- B. convert rubber from thermosetting to thermo plastics polymer
- C. from chains which bind rubber molecules together
- D. break down rubber polyer
- E. shorten the chain length of rubber polyer
Which of the following roles does sodium chloride play in soap preparation? It
- A. reacts with glycerol
- B. purifies the soap
- C. accelerates the decomposition of the fat or oil
- D. separates the soap from the glycerol
- E. converts the fatty acid to its sodium salt
An aqueous solution of an inorganic salt gave white precipitate (i) soluble in excess aqueous NaOH (ii) insoluble in excess aqueous NH3 (iii) with dilute HCl. The cation present in the inorganic salt is?
- A. Na4+
- B. Ca++
- C. Zn++
- D. Al+++
- E. Pb++
The process involved in the conversion of an oil into margarine is known as?
- A. hydrogenation
- B. condensation
- C. pyrolysis
- D. dehydration
- E. cracking