What weight of NaCl is needed to make 2.0 dm3 of a 1.5M solution?
[Na = 23, Cl = 35.5]
- A. 116 g
- B. 175 g
- C. 87 g
- D. 58 g
Smog usually occurs over cities which
- A. burn a lot of fossil fuels
- B. have very few plants
- C. are surrounded by water
- D. are overpopulated
A good drying agent should be
- A. deliquescent
- B. effervescent
- C. hygroscopic
- D. efflorescent
The presence of nitrogen in air is to slow down
- A. respiration and combustion
- B. combustion and corrosion
- C. corrosion and respiration
- D. respiration and transpiration
A supersaturated solution is said to contain
- A. more solute than it can dissolve at that temperature in the presence of undissolved solute
- B. as much solute as it can dissolve at that temperature in the presence of undissolved solute
- C. as much solute as it can dissolve at that temperature
- D. more solute than it can dissolve at that temperature
When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of
- A. calcium tetraoxosulphate(VI)
- B. calcium trioxocarbonate (IV)
- C. calcium hydrogentrioxocarbonate (IV)
- D. aluminium trioxocarbonate (IV)
The IUPAC nomenclature of compound CH\(_3\)CH\(_2\)COOCH\(_2\)CH\(_3\) is
- A. propyl ethanoate
- B. ethyl butanoate
- C. ethyl propanoate
- D. methyl butanoate
Certain useful waxes are composed mainly of
- A. amino acids
- B. glycerols
- C. alkanols
- D. alkanoates
Which of the following alkanes has the highest boiling point?
- A. Pentane
- B. Ethane
- C. Propane
- D. Methane
The conversion of open chain alkanes into cycloalkanes and aromatic compounds is called
- A. cracking
- B. reforming
- C. isomerization
- D. polymerization
How many structural isomers of chlorobutane are possible?
- A. 4
- B. 3
- C. 2
- D. 1
The hydrocarbon used in the production of styrene is
- A. ethyne
- B. propyne
- C. ethane
- D. ethene
Which of the following compounds is the best possible anti-knock agent for petrol?
- A. (CH3)2CH - CH(CH3)CH2CH3
- B. CH3CH2(CH3)CHCH2CH2CH3
- C. CH3CH2(CH3)CHCH2CH2CH3
- D. (CH3)3C - CH2CH2CH3
CH\(_3\)CH\(_2\)Cl + KCN → CH\(_3\)CH\(_2\)CN + KCl
In the reaction above, the cyanide is
- A. hydrophobic
- B. hydrophilic
- C. nucleophilic
- D. electrophilic
Which of the following represents an aromatic compound?
- A. C6H5OH
- B. C6H12
- C. C6H9OH
- D. C6H8
A mixture of petrol and water can be separated through
- A. centrifugation
- B. distillation
- C. the use of separating funnel
- D. the use of filter paper
A metal X forms two bromides with the formulae XBr2 and XBr3. What type of bonding exists between X and bromine in the bromide?
- A. Ionic bonding
- B. Metallic bonding
- C. Dative bonding
- D. Covalent bonding
The elements that belong to the third period of the periodic table are?
- A. Li, Be, Al and P
- B. Na, P, O and Cl
- C. B, C, N and O
- D. Na, Mg, S and Ar
Which of the following decrease when a given mass of gas is compressed to half its initial volume?
- A. Atomic radius of each
- B. Average intermolecular distance
- C. Frequency of collisions
- D. Number of molecules presents
If the electron configuration of an element is 1S\(^2\) 2S\(^2\)2P\(^5\), how many unpaired electron are there?
- A. 2
- B. 8
- C. 1
- D. 4
How many electrons are in the L shell of \(^{31}_{15}\)P?
- A. 5
- B. 8
- C. 18
- D. 2