The stability of atomic nucleus is determined by ratio of
- A. Neutron/electron
- B. Neutron/proton
- C. positron/neutron
- D. electron/proton
The law which states that a pure chemical compound, no matter how it is made, will be made up of the same elements contained in the same proportion by mass is
- A. law of conservation of masses
- B. law of definite proportion
- C. law of multiple proportion
- D. law of reciprocal proportion
The percentage of hydrogen in the sixth member of the class of the aliphatic alkanes is [H =1, C =12 ]
- A. 41.34
- B. 59.54
- C. 16.28
- D. 83.72
The compound of Copper used as a fungicide is
- A. CuCO\(_3\)
- B. Cu(NO\(_3\))\(_2\)
- C. CuSO\(_4\)
- D. CuCl\(_2\)
If a salt weighs 2g and upon exposure to the atmosphere weighs 1.5g, this is as a result of
- A. hygroscopy
- B. effervescence
- C. efflorescence
- D. deliquescence
The volume occupied by 1 mole of an ideal gas at a temperature of 13\(^0\)C and a pressure of 1.58 atm is
[ R = 0.082 atm dm\(^3\) K\(^{-1}\)mol\(^{-1}\) ]
- A. 14.84 dm\(^3\)
- B. 14.84 cm\(^3\)
- C. 0.64 dm\(^3\)
- D. 0.64 cm\(^3\)
Calculate the number of moles of Copper that will be deposited, if 2 Faraday of electricity is passed through the copper during the electrolysis of copper(II)tetraoxosulphate(VI)
[1F = 96500C ]
- A. 0.5 mole
- B. 1.0 mole
- C. 2.0 moles
- D. 3.0 moles
Which of the following is used in forming slag in the blast furnace for the extraction of iron?
- A. Ca(CO\(_3\) )\(_2\)
- B. Ca(OH)\(_2\)
- C. CaCO\(_3\)
- D. CaO
A type of isomerism that ClCH=CHCl can exhibit is
- A. chain
- B. positional
- C. functional group
- D. optical
In the conductance of aqueous CuSO\(_4\) solution, the current carriers are the
- A. mobile electrons
- B. metallic ions
- C. hydrated ions
- D. hydrated electrons
Hydrogen chloride gas and ammonia can be used to demonstrate the fountain experiment because they are
- A. light
- B. volatile
- C. very soluble in water
- D. heavy gases
A radioactive element of mass 1g has half-life of 2 minutes, what fraction of the substance would have disintegrated after 10 minutes?
- A. 1/4
- B. 1/8
- C. 1/16
- D. 1/32
Hydrochloric acid is not suitable in the preparation of ethanoic acid because it
- A. is too acidic
- B. is too volatile
- C. can attack cork and rubber used as containers
- D. turns blue litmus red
After breathing in a test tube that contains acidified K\(_2\)Cr\(_2\)O\(_7\), a man noticed the change in the colour of K\(_2\)Cr\(_2\)O\(_7\) from orange to green. This suggests the presence of
- A. alkanone
- B. alkanal
- C. alkanol
- D. alkanoic acid
What accounts for the low melting and boiling points of covalent molecules?
- A. They have weak intermolecular forces.
- B. They are three-dimensional structures.
- C. They have definite shapes.
- D. They possess shared electron pairs
The general molecular formula C\(_n\)H\(_{2n-2}\) represents that of an
- A. alkyne
- B. alkene
- C. alkane
- D. alkanal
Benzene formed nitrobenzene at temperature of 60\(^0\)C when it reacts with mixture of concentrated trioxonitrate(V) acid and concentrated
- A. phosphoric acid
- B. hydrochloric acid
- C. tetraoxosulphate(VI) acid
- D. hydrogen iodide
Alkylation of benzene is catalyzed by
- A. palladium
- B. nickel
- C. sunlight
- D. aluminium chloride
C\(_x\)H\(_y\)O + 5O\(_2\) → 4CO\(_2\) + 4H\(_2\)O
C\(_x\)H\(_y\)O in the equation is
- A. CH\(_2\)O
- B. C\(_2\)H\(_6\)O
- C. CH\(_4\)O
- D. C\(_2\)H\(_4\)O
The reaction between alkanoic acids and alkanols in the presence of an acid catalyst is known as
- A. saponification
- B. dehydration
- C. esterification
- D. hydrolysis