What is the characteristic of the gas liberated when dilute hydrochloric acid is added to Iron(ii)sulphide?
- A. turns lime water milky
- B. decolorizes bromine water
- C. gives a pop sound
- D. turns lead(ii)ethanoate paper black
Which of the following compounds is formed by the oxidation of ethanol?
- A. C\(_2\)H\(_4\)CO\(_2\)H
- B. C\(_2\)H\(_5\)CO\(_2\)H
- C. CH\(_3\)OH
- D. CH\(_3\)CO\(_2\)H
If the value of ΞH is positive for a reaction, it means that the reaction is?
- A. exothermic
- B. endothermic
- C. spontaneous
- D. slow
When quicklime dissolves in water?
- A. heat is absorbed
- B. heat is evolved
- C. oxygen is liberated
- D. hydrogen is given off
which of the following pairs of substances has the highest heat of neutralization?
- A. strong acid and strong base
- B. weak acid and weak base
- C. strong acid and weak base
- D. weak acid and strong base
consider the following reaction equation: 2Al(OH)\(_3\) + 3H\(_2\)SO\(_4\) βAl\(_2\)(SO4)\(_3\)(aq)+6H\(_2\)O. How many moles of tetraoxosulphate(vi)acid is needed to produce 0.5mol of aluminium tetraoxosulphate(vi)?
- A. 0.5
- B. 1.0
- C. 1.5
- D. 3.0
The most suitable indicator for the reaction between NaOH and HCOOH is?
- A. bromocresol
- B. methyl orange
- C. methyl red
- D. phenolphthalein
A sample of air was bubbled into water. The PH of the water slowly changed from 7 to 6. Which of the following gases in the samples caused the change?
- A. carbon(iv)oxide
- B. carbon(ii)oxide
- C. nitrogen
- D. oxygen
which of the following solutions containing one mole per dm\(^3\) of the compound would have the lowest PH?
- A. ethanoic acid
- B. hydrochloric acid
- C. sodium chloride
- D. sodium hydrogentrioxocarbonate(iv)
Vinegar is an aqueous solution of?
- A. Hydrochloric acid
- B. ethanedioc acid
- C. ethanoic acid
- D. hydrofluoric acid
What is the solubility of a salt X at 25ΒΊC if the saturated solution of the salt contains 0.28g in 100cm\(^3\) of the solution in mol\dm\(^3\)?
[ X = 56.0g ]
- A. 0.05
- B. 0.10
- C. 2.60
- D. 2.80
The properties of a good primary standard solution include the following except?
- A. High molecular mass
- B. low molecular mass
- C. high degree of purity
- D. readily available
The name of the compound CH\(_3\)C(CH\(_3\))\(_2\)CH\(_2\)CH\(_2\)CH\(_3\)
- A. 2 - methyl butane
- B. 2,2 - dimethyl butane
- C. 2 - methyl pentane
- D. 2,2 - dimethyl pentane
Which of the following compounds has coordinate bonds in its structure?
- A. Al\(_2\)Cl\(_6\)
- B. MgCl\(_2\)
- C. AgCl
- D. NaCl
What is the percentage by mass of H in CH\(_3\)COOH ?
- A. 1.7%
- B. 5.0%
- C. 6.7%
- D. 7.1%
Stoichiometry is based on the law?
- A. multiple proportion
- B. constant composition
- C. conservation of energy
- D. conservation of mass
How many moles of carbon(iv)oxide contains 16.0g of oxygen?
[ C = 12.0, O = 16.0 ]
- A. 0.20 mol
- B. 0.25 mol
- C. 0.40 mol
- D. 0.50 mol
When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?
- A. Saturated
- B. Unsaturated
- C. Concentrated
- D. Diluted
Which of the following pairs of components have the same molecular mass?
[ H = 1.0, C = 12.0, O = 16.0 ]
- A. Ethene and Ethyne
- B. Ethane and Ethene
- C. Carbon (ii) Oxide and Ethene
- D. Carbon (iv) Oxide and Ethyne
Which of the substances is non-polar?
- A. Bromine
- B. Ammonia
- C. Water
- D. Hydrogen Bromide
Calcium and magnesium belong to the group of the periodic table because both?
- A. are metals
- B. form cations
- C. form colourless salts
- D. have same number of valence electrons