How many unpaired electron(s) are there in the nitrogen sub-levels?
- A. 3
- B. 2
- C. 1
- D. none
Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the?
- A. decrease in nuclear charge
- B. increase in nuclear charge
- C. decrease in screening effect
- D. increase in screening effect
The volume of a given gas is V cm3 P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature?
- A. 4 V cm3
- B. 2 V cm3
- C. V/2 cm3
- D. V cm3
The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the?
- A. water vapour in the air around the bottle gains some energy from the bottle
- B. temperature of the milk drops as it loses heat into the surroundings
- C. saturated vapour pressure of the milk is equal to the atmospheric pressure
- D. water vapour in the air around the bottle loses some of its energy to the bottle
Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]
- A. 8.5%
- B. 13.1%
- C. 17.1%
- D. 27.6%
Which of the following is an example of a mixture?
- A. Common salt
- B. Blood
- C. Sand
- D. Washing soda
Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have?
- A. a single bond
- B. a double bond
- C. a triple bond
- D. an ionic bond
The simplest branched-chain hydrocarbon is
- A. ethane
- B. ethene
- C. propane
- D. butane
The molecular formula of a common organic laboratory anaesthetic is
- A. CHCl3
- B. CHI3
- C. CCl4
- D. CHF3
Which of the following hydrocarbons is mainly used as fuel?
- A. Methylene
- B. Ethylene
- C. Methane
- D. Ethyne
An organic compound reacted with bromine water to give a colourless solution. The compound is probably an?
- A. alkene
- B. alkanal
- C. alkyl
- D. alkanone
A compound commonly used for sterilization and preservation of specimens and food is
- A. ethanol
- B. benzene
- C. ether
- D. ammonia
Lucas reagent is used to test for?
- A. alkanes
- B. alkanoic acids
- C. alkanols
- D. amines
Which of the following class of compounds can exist as dipolar ions in solution?
- A. Alkanoic acid
- B. Fatty acids
- C. Dialkanoic acids
- D. Amino acids
Which of the following molecules has two other positional isomers?
- A. CH3CH2Br
- B. CH3CHBrCH3
- C. CBr2F2
- D. CH2CHBrCH2Br
A cracking process in petroleum refining can be represented by
- A. heptane to heptene
- B. heptane to 3-methylhexane
- C. heptane to propene and butane
- D. heptane to 2,3,3-trimethybutane
One of the products of the thermal decomposition of sodium trioxonitrate (V) is?
- A. sodium
- B. nitrogen
- C. sodium dioxonitrate (III)
- D. sodium oxide
In the electrolytic extraction of aluminum, the function of the molten cryolite is to
- A. precipitate aluminium hdroxide
- B. lower the melting point of aluminium oxide
- C. act as a raw materials
- D. act as a solvent
The type of iron that is best suited for welding, making nails, chains and iron rods is?
- A. pig iron
- B. wrought iron
- C. cast iron
- D. iron pyrites
Copper metal dissolves in concentrated trioxonitrate (V) acid with the resultant evolution of?
- A. CO2
- B. SO2
- C. NO2
- D. CO
which of the following metals will show the highest metallic character?
- A. Zinc
- B. Copper
- C. Barium
- D. Calcium