Question 1 of 20 1,623 total questions
When naphthalene on heating changes from the solid state directly to the gaseous state it undergoes
A evaporation
B sublimation
C decomposition
D combustion
E ionisation
Calcium is usually extracted by the electrolysis of its
A trioxonitrate (V)
B tetraoxosulphate (IV)
C oxide
D hydride
E chloride
Polyatomicity is illustrated by molecules of
A sulphur
B carbon (IV) oxide
C noble gases
D liquefied oxygen
E liquefied nitrogen
The following will decolourize acidified potassium tetraoxomanganate (VII) solution except
A sulphur (lV) oxide
B but-3-ene
C pentane
D hydrogen sulphide
E propyne
Tetraoxosulphate (lV) acid is described as strong acid because it is highly
A corrosive
B concentrated
C reactive
D soluble in water
E ionized in water
The number of atoms in 1.2g of carbon - 12 isotope is
A 1.00 x 10 22
B 6.02 x 1022
C 1.20 x 10 23
D 1.00 x 1023
E 6.02 x 1024
The oxidation number of phosphorus in \(PO_4^{3-}\) is
Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M(s) + 2HCI(aq) → MCI2(aq) + H2(g)
A Diluting the hydrochloric acid
B Adding some distilled water
C Decreasing the temperature
D Grinding the metal into powder
E Increasing the pressure
Which of the following is not a property of magnesium oxide?
A High melting point
B Dissolution in polar solvents
C Presence of ionic bonds
D Possession of crystal lattice
E Low binding energy
In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of
A definite proportion
B conservation of matter
C multiple proportions
D reciprocal proportions
E constant composition
A measure of the degree of disorder in a chemical system is known as the
A enthalpy
B free energy
C activation energy
D entrophy
E equilibrium
Catalytic hydrogenation of alkenes produces compounds with the general formula
A Cn H2n+1 OH
B Cn H2n+1
C Cn H2n+2
D Cn H2n-2
E Cx (H2 O)y
The number of replaceable hydrogen atoms in one acid indicates its
A basicity
B acidity
C alkalinity
D reactivity
E pH value
The components of universal indicator solution can best be separated by
A chromatography
B filtration
C evaporation
D crystallization
E fractional distillation
The alloy used for metal work and plumbing contains
A lead and tin
B iron and carbon
C copper and tin
D aluminium and copper
E lead and antimony
Zinc displaces copper from an aqueous solution of copper (ll) salt because
A copper is a transition element
B copper is a moderately reactive metal
C Zinc and copper have reducing prperties
D zinc is more reactive than copper
E zinc reacts with both acids and alkalis
When ammonium chloride is dissolved in water in a test tube, the tube feels colder showing that
A the solution is unsaturated
B sublimation has ocurred
C ammonia gas is evolved
D the process is endothermic
E condensation has occurred
The product of the reaction between ethanol and excess acidified K\(_2\)Cr\(_2\)O\(_7\) is
A ethanal
B ethylethanoate
C ethanoic acid
D ethyne
E ethanedioic acid
Which of the following is correct about the electrons in the 1s orbital? They
A have the same spin
B are easier to remove than those in the 2p orbital
C are closest to the nucleus
D have the same energy as those in the 2s orbital
E have different magnetic quantum numbers
Which of the following gases are diatomic except
A nitrogen
B helium
C hydrogen
D fluorine
E oxygen
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