A little quantity of trichloromethane (b.pt 60,oC) was added to a large quantity of ethanol (b.pt 78,oC). The most probable boiling point of the resultant mixture is from
- A. 69 oC - 70 oC
- B. 70 oC – 74 oC
- C. 82 oC – 84 oC
- D. 60 oC – 78 oC
The formula CH\(_2\)O for ethanoic acid is regarded as its
- A. Molecular formula
- B. General formula
- C. Empirical formula
- D. Structural formula
A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]
- A. KClO4
- B. KClO
- C. KClO2
- D. KClO3
When sodium reacts with water, the resulting solution is
- A. Weakly acidic
- B. Neutral
- C. Acidic
- D. Alkaline
\(C_{12}H_{22}O_{11(s)} + H_2SO_{4(aq)} → 12C(s) + 11H_2O(l) + H_2SO_{4(aq)}\)
In the reaction above, tetraoxosulphate (VI) acid function as
- A. A dehydrating agent
- B. An oxidizing agent
- C. A reducing agent
- D. A catalyst
Which of the following represent hybridization in ethyne?
- A. Sp2
- B. Sp2d
- C. Sp3
- D. Sp
Which of the following metals burn with brick red flame?
- A. Pb
- B. Ca
- C. Na
- D. Mg
The gas that can best be collected by downward displacement of air is
- A. Chlorine
- B. Sulphur (IV) oxide
- C. Ammonia
- D. Carbon (IV) oxide
A burning candle produces water and
- A. Carbon (II) oxide
- B. Carbon (IV) oxide
- C. Oxygen
- D. Hydrogen
The pair of organic compounds that are isomers is
- A. Benzene and methylbenzene
- B. Trichloromethane and tetrachloromethane
- C. Ethanol and propane
- D. But-1-ene and but-2-ene
A characteristic reaction of the compounds with the general formula C\(_n\)H\(_{2n}\) is
- A. Esterification
- B. Polymerization
- C. Decarboxylation
- D. Substitution
Proteins in acid solution undergo
- A. Polymerization
- B. Substitution
- C. Fermentation
- D. Hydrolysis
When chlorine Is passed into water and the resulting solution exposed to sunlight, the product formed are
- A. Chlorine gas and hydrogen
- B. Oxygen and oxochlorate (I) acid
- C. Chlorine gas and oxochlorate (I) acid
- D. Hydrochloric acid and oxygen
Catalytic hydrogenation of benzene produces
- A. Oil
- B. Cyclohexene
- C. Cyclohexane
- D. Margarine
During the vulcanization of rubber, sulphur is added to
- A. Break down rubber polymer
- B. Lengthen the chain of rubber
- C. Bind rubber molecules together
- D. Act as a catalyst
The main impurity in iron ore during the extraction of iron is
- A. Silicon (IV) oxide
- B. Carbon (IV) oxide
- C. Calcium trioxosilicate
- D. Sulphur (II) oxide
The general formula for the alkanals is
- A. ROH
- B. R2CO
- C. RCOOR1
- D. RCHO
Fermentation is the
- A. breaking down of carbohydrate to glucose
- B. conversion of sugar to alcohol in the presence of yeast
- C. breaking down of sugar to carbohydrate
- D. conversion of alcohol to sugar in the presence of yeast
NH\(_3\)\(_{(g)}\) + HCl\(_{(g)}\) → NH\(_4\)Cl\(_{(s)}\)
The entropy change in the system above is
- A. negative
- B. indeterminate
- C. positive
- D. zero
In which of the following reactions has the oxidation number of nitrogen increased?
- A. 2NO(g) + Br2(l) → 2NOBr(l)
- B. 2NO(g) + O2(g) → 2NO2(g)
- C. FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
- D. 2NO(g) + Cl2(g) → 2NOCl(l)