in Boyle’s law?
- A. T is constant, P varies directly with V
- B. P is constant, V varies inversely with T
- C. V is constant, P varies directly with T
- D. T is constant, V varies inversely with P
Which of the following substances can be classified as heavy chemicals?
- A. CaOCl\(_2\)
- B. H\(_2\)SO\(_4\)
- C. AgNO\(_3\)
- D. CaO
Consider the following reaction represented by the following equation: C\(_2\)H\(_2\) \(^{H\(_2\)}_{โ}\) X \(^{H\(_2\)}_{โ}\) Y. X and Y respectively are?
- A. ethane and ethene
- B. ethene and ethane
- C. ethyne and ethene
- D. ethane and ethyne
which of the following organic compounds has the lowest boiling point?
- A. C\(_6\)H\(_14\)
- B. C\(_5\)H\(_12\)
- C. C\(_4\)H\(_10\)
- D. ( CH\(_3\) )\(_3\)
Biotechnology is applied in the?
- A. treatment of sewage
- B. treatment of water
- C. purification of chemicals
- D. purification of metals
In a mixture of gases which do not react chemically together, the pressure of the individual gas is?
- A. atmospheric pressure
- B. vapor pressure
- C. total pressure
- D. partial pressure
consider the reaction represented by the following equation: 2SO\(_2\) + O\(_2\) โ 2SO\(_3\)
A decrease in the pressure of the reaction would
- A. decrease in the concentration of SO\(_2\)
- B. have no effect on the reaction
- C. shift the equilibrium position to the left
- D. shift the equilibrium position to the right
If the oxidation potential of Mg and Al are +2.37 volts and + 1.66 volts respectively, then the Mg would?
- A. not replace Al
- B. be replaced by Al
- C. remain in the solution
- D. replace Al
The process by which alkanoic acid reacts reversibly with alkanols is known as?
- A. saponification
- B. esterification
- C. carboxylation
- D. halogenation
The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?
- A. +4
- B. +5
- C. +6
- D. +7
consider the following reaction equation: 2NH\(_3 \) .+ 3Cl\(_2\) โ N2 + 6HCl.
NH\(_3\) is acting as?
- A. a reducing agent
- B. a dehydrating agent
- C. a drying agent
- D. an oxidizing agent
If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the?
- A. activation energy of the reaction
- B. rate of the reaction
- C. rate of the reverse reaction
- D. heat of reaction
which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol
- A. H+ / K2Cr2O7
- B. I\(_2\) / OH-
- C. CH\(_3\)COOH
- D. NaCl
When excess chlorine is mixed with ethane at room temperature, the product formed is?
- A. 1,2-dichloroethane
- B. 1,2-dichloroethene
- C. 1,1-dichloroethane
- D. 1,1-dichloroethene
An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound?
[ H = 1.0. C = 12.0, O = 16.0 ]
- A. C\(_3\)H\(_8\)O
- B. C\(_6\)H\(_{12}\)O
- C. C\(_6\)H\(_{12}\)O\(_2\)
- D. C\(_{12}\)H\(_{12}\)O\(_{11}\)
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 ฮH 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\(_4\) โAl\(_2\)(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