If 24.83 cm3 of 0.15 M NaOH is titrated to its end point with 39.45 cm3
of HCl, what is the molarity of the HCl?
- A. 0.094 M
- B. 0.150 M
- C. 0.940 M
- D. 1.500 M
In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?
- A. Ethanoic acid, milk or magnesia, sodium chloride, hydrochloric acid and sodium hydroxide
- B. Ethanoic acid, hydrochloric acid, milk of magnesia, sodium chloride and sodium chloride and sodium hydroxide
- C. Hydrochloride acid, ethanol acid, sodium chloride, milk of magnesia and sodium hydroxide
- D. Hydrochloride acid, sodium hydroxide sodium chloride, ethanol acid, and milk of magnesia
The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the saturated solution?
(As = 75, Na = 23, O = 16, H = 1)
- A. 87.27%
- B. 38.9%
- C. 19.1%
- D. 13.7%
Oil spillage in ponds and creeks can be cleaned up by?
- A. burning off the oil layer
- B. spraying with detergent
- C. dispersal with compressed air
- D. spraying with hot water
Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?
- A. Permanently hard water after boiling
- B. emporarily hard water after boiling
- C. Rain water stored in a glass jar for two years
- D. Permanent hard water passed through permuitit
In the purification of town water supply, alum is used principally to?
- A. kill bacteria
- B. control the pH of water
- C. improve the taste of the water
- D. coagulate small pasrticles of mud
A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?
- A. CO2 ad ithe inert gases
- B. N2, CO2 and the inert gases
- C. N2 and the inert gases
- D. water vapour, N2 and the inert gases
The greater the different in electronegativity between bonded atoms, the?
- A. lower the polarity of the bond
- B. higher the polarity of the bond
- C. weaker the bond
- D. higher the possibility of the substance formed being a molecule
When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?
- A. oxyethylene flame
- B. oxyhydrocarbon flame
- C. oxyacetylene flame
- D. oxymethane flame
Complete oxidation of propan -1- ol gives?
- A. propanal
- B. propan-2-al
- C. propan-1-one
- D. propanoic acid
Synthetic rubber is made by polymerization of?
- A. 2 methyl buta - 1, 3 - diene
- B. 2 methyl buta - 1, 2 - diene
- C. 2 methyl but -1-ene
- D. 2 methyl but-2-ene
Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?
- A. acid
- B. ester of allanoic acid
- C. alkali
- D. alkanol
The most volatile fraction obtained from fractional distillation of crude petroleum contains?
- A. butane , propane and kerosene
- B. butane , propane and petrol
- C. ethane, methane and benzene
- D. methane, ethane and propane
Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?
- A. trichloromethane
- B. triodomethane
- C. iodoethane
- D. ethanal
The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?
- A. branched chain alkanes
- B. straight chain alkanes
- C. cycloalkanes
- D. halogenated hydrocarbons
Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?
- A. CH3 = CHCH3
- B. CH3 ≡ CCH3
- C. HC = C-CH2CH3
- D. CH2 = CH-CH = CH2
Inspite of the electronic configuration, 1s22s22p2, carbon is tetraavalent because?
- A. the electrons in both 2s and 2p orbitals have equal energy
- B. the electrons in both 2s and 2p orbitals are equivalent
- C. both the 2s and 2p orbitals hybridizes
- D. the six orbitals hybridize to four
Corrosion is exhibited by?
- A. iron only
- B. electropostive metals
- C. metals below hydrogen inthe electrochemical series
- D. all metals
Alloys are best prepared by?
- A. high temperature weilding of the metals
- B. electrolysis using the major metallic component as cathode
- C. reducing a mixture of the oxies of the elements
- D. cooling a molten mixture of the necessary elements
Stainless steel is an alloy of?
- A. Iron, carbon and silver
- B. iron, carbon and lead
- C. iron, carbon and chromium
- D. iron and carbon only
Which of the following elements will form oxide which will dissolve both in dilute HNO3 and NaOH solutions to form salts?
- A. Al
- B. Mg
- C. Ag
- D. Mn