Which of the following methods is NOT used for the separation of mixtures?
- A. Chromatography
- B. Crystallization
- C. Distillation
- D. Electrolysis
The method used to collect gas in the laboratory depends on its?
I. boiling point II. density III. smell IV. solubility in water
- A. i and ii only
- B. ii and iv only
- C. iii and iv
- D. i, ii, iii and iv
The number of electrons in the 3d orbital of \(_24\)Cr is
- A. 2
- B. 3
- C. 4
- D. 5
The atoms of \(^{64}_{29}\)Cu and \(^{65}_{30}\)Zn have the same number of?
- A. nucleon
- B. electrons
- C. neutrons
- D. protons
One of the deductions from Rutherford’s alpha particle scattering experiment is that?
- A. electrons are negatively charged
- B. electrons have a negligible mass
- C. nuclei of atoms are positively charged
- D. protons are positively charged
Which of the following apparatus is NOT used in volumetric analysis?
- A. Pipette
- B. Burette
- C. Desiccator
- D. conical flask
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\(_2\)}_{→}\) X \(^{H\(_2\)}_{→}\) 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\(_2\) ⇌ 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\(_2\) → 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\(_{11}\)