The furring of kettles is caused by the presence of what compound in water?
- A. calcium tetraoxosulphate (IV)
- B. calcium hydrogentrioxocarbonate (IV)
- C. calcium hydroxide
- D. calcium trioxocarbonate (IV)
Which of the following results in the fall of acid rain?
- A. oxide of lead
- B. particulate matter
- C. oxides of sulphur
- D. gaseous hydrocarbon
Detergents are manufactured with straight hydrocarbon chains, is to make them
- A. soluble
- B. biodegradable
- C. cheaper
- D. foamy
NH3(g) + HCl(s) → NH 4Cl (s)
The entropy change in the system above is
- A. positive
- B. zero
- C. negative
- D. intermediate
When sugar is dissolve in tea, the reaction is accomplished by?
- A. positive change
- B. negative entropy change
- C. no entropy change
- D. a minimum entropy change
The elements that belong to the third period of periodic table are
- A. Li, Be, Al and D
- B. Na, P, O and Cl
- C. B, C, N, and O
- D. Na, Mg, S and Ar
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
What volume of 0.5mldm3 H2SO4 will exactly neutralize 20cm3 of 0.1moldm3 NaOH Solution?
- A. 2.0cm3
- B. 5.0cm3
- C. 6.8cm3
- D. 8.3cm3
The energy value of petrol can be determined by
- A. Bomb calorimeter
- B. Catalytic cracker
- C. Fractionating column
- D. Thermometer
The basic particles from which matter could be made up of are as follow, except?
- A. Salt
- B. Atom
- C. Ion
- D. Molecule
\(Cu_2S_{(s)}+ O_{2(g)} = 2CU_{(s)} + SO_{2(g)}\).
In the above reaction, the oxidation number of Cu changes from ___ to _______?
- A. +1 to 0
- B. 0 to +2
- C. +2 to +1
- D. 0 to +1
All these are electromagnetic waves except
- A. White light
- B. Photon
- C. X-ray
- D. Infrared
Which of these radioactive elements is commonly used as a nuclear fuel
- A. uranium
- B. palladium
- C. actium
- D. thorium
A major source of oxide of nitrogen is from the burning of
- A. coal
- B. wood
- C. fuel
- D. chlorofluorocarbons
Rare gases are stable because they
- A. are monoatomic
- B. form ions easily
- C. have duplet or octet electronic configuration in the outermost shells in their atoms
- D. are volatile gases
Which of the following types of alkanols undergo oxidation to produce alkanoic acids.
I. Primary alkanols
II. Secondary alkanols
III. Tertiary alkanols
- A. I, II and III
- B. I and II only
- C. III only
- D. I only
Hydrogen can be displaced from a hot alkaline solution by
- A. Fe
- B. Cu
- C. Ca
- D. Sn
Which of the following ions requires the largest quantity of electricity for discharge at an electrode?
- A. 2.0 mole of Q3+
- B. 2.5 mole of R2+
- C. 3.0 mole of T-
- D. 4.0 mole of Y-
A fixed mass of gas occupies 92cm3 at 3°C. What will be its volume at 18C if the pressure remains constant?
- A. 15.3cm3
- B. 87.3cm3
- C. 2.0cm3
- D. 97.0cm3