Argon is used in gas-filled electric lamp because it helps to?

• A. prevent the reduction of the lamp fillaments
• B. prevent oxidation of the lamp fillaments
• C. make the lamp fillament glow brightly
• D. keep the atmosphere in the lamp inert

(a) (i) State the important points put forward in Dalton’s atomic theory.

(ii) How does the theory explain the law of multiple proportion?

(b) (i) Namethree commercially useful products that may be obtained by chemical transformation of vegetable oils.

(ii) With the aid of equations, describe the chemical reaction involved in the transformations stated in (b)(i).

(c) Certain properties of Beryllium (Be) and its compounds differ from those of Magnesium (Mg) and its compounds, but rather resembles those of Aluminium and its compounds. Explainbriefly why this is so.

(d) Write balanced equation for the reaction between iodine and aqueous sodium trioxothiosulphate(VI).  

Which of the following laws or theory cannot be explained by the application of the kinetic theory of gases?

• A. Dalton's atomic theory
• B. Charle's law
• C. Boyle's law
• D. Gay- Lussac's law

tartaric acid is used industrially to

• A. make baking powder
• B. make fruit juices
• C. remove rust
• D. dry substance

Which of the following is an example of an endothermic reaction?

• A. Combustion of propane (C₃H₈) to produce carbon dioxide (CO₂) and water (H₂O).
• B. Burning of methane (CH₄) in the presence of oxygen
• C. Formation of table salt (NaCl) from sodium (Na) and chlorine (Cl₂).
• D. Decomposition of hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen (O₂).

The process of changing one element into another is called

• A) radioisotope
• B) radioactivity
• C) dating
• D) transmutation

What term is used to describe an oxide whose aqueous solution turns blue litmus red?

• A. Strong electrolyte
• B. Acid anhydride
• C. Amphoteric oxide
• D. Basic oxide

Question 22 A few drops of concentrated HNO3 is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation presents is likely to be

• A) Pb²⁺
• B) Cu³⁺
• C) Fe³⁺
• D) Fe²⁺

The following can be obtained directly from the destructive distillation of coal except

• A. ammoniacal liquor
• B. coke
• C. producer gas
• D. coal gas

The carbon atoms on ethane are

• A)
  sp² hybridized
• B)
  sp hybridized
• C)
  sp³ hybridized
• D)
  sp²d hybridized