A carcinogenic substance is
- A. asbestos dust
- B. sawdust
- C. nitrogen (II) oxide
- D. carbon (II) oxide
Pollution of underground water by metal ions is very likely in the soil that has high
- A. acidity
- B. alkalinity
- C. chloride content
- D. nitrate content
Hardness of water is caused by the presence of ions of
- A. magnesium and silver
- B. cacium and magnesium
- C. sodium and potassium
- D. calcium and sodium
Which of the following mixture of gases is likely to burn in flame
- A. neon and hydrogen
- B. nitrogen and helium
- C. helium and neon
- D. neon and nitrogen
Chlorine consisting of two isotopes of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotopes of mass number 37
- A. 20
- B. 25
- C. 60
- D. 75
The property of chlorine which causes hydrogen chloride to be more ionic than the chlorine molecules is its
- A. electrovalency
- B. electron affinity
- C. electropositivity
- D. electronegativity
\(^{226}\)\(_{88}\)Ra → \(^x\)\(_{86}\)Rn + α – particle
What is the value of x in the nuclear reaction above?
- A. 220
- B. 222
- C. 226
- D. 227
The shape of s-orbitals is
- A. spherical
- B. elliptical
- C. spiral
- D. circular
An electron can be added to a halogen atom to form a halide ion with
- A. 2 valence electrons
- B. 3 valence electrons
- C. 7 valence electrons
- D. 8 valence electrons
A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions?
[C = 12, H = 1, S = 32, O = 16
- A. 5s
- B. 20s
- C. 40s
- D. 60s
It is difficult to achieve an orderly arrangement of the molecules of a gas because they?
- A. have no definite shape
- B. have little force of attraction between them
- C. can collide with one another in the container
- D. are too small in size
According to charles’ law, the volume of a gas becomes zero at
- A. 0 oC
- B. -100 oC
- C. -273 oC
- D. -373 oC
What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of a gas at s.t.p = 22.4 dm\(^3\)
- A. 112 cm2
- B. 224 cm2
- C. 448 cm2
- D. 2240 cm2
If a solution contains 4.9g of tetraoxosulphate (VI) acid, calculate the amount of copper (II) oxide that will react with it
[Cu = 64, O = 16, S = 32, H = 1]
- A. 0.8g
- B. 4.0g
- C. 40.0g
- D. 80.0g
A chemical reaction is always associated with
- A. an increase in the composition of one of the substance
- B. a change in the volume of the reactants
- C. a change in the nature of the reactants
- D. the formation of new substance
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone
- A. evaporation
- B. distillation
- C. crystallization
- D. sublimation
The principal constituent of natural gas is
- A. methane
- B. ethane
- C. propane
- D. butane
Which of the following is found in cotton
- A. Starch
- B. Cellulose
- C. Fat
- D. Oil
The process by which atoms are rearranged into different molecular structure in the petroleum refining process is referred to as
- A. catalytic cracking
- B. hydrocracking
- C. polymerization
- D. reforming
A compound contains 40.0% carbon 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.
[H = 1, C = 12, O = 16]
- A. CH2O
- B. C3H6O3
- C. C6H12O6
- D. C6H12O3
Ethanol reacts with excess acidified K\(_2\)Cr\(_2\)O\(_7\) to produce
- A. ethanedioic acid
- B. ethanal
- C. ethylethanoate
- D. ethanoic acid