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To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be
Which of the following alloys contain iron?
In a flame test for calcium, the flame appears
The property used in the industrial preparation of nitrogen and oxygen from air is?
The ores that can be concentrated by flotation are
Metalloids are also referred to as
The most abundant element on the earth's crust is
In the diagram above which of the curves illustrates Arrhenius' law?
The most suitable metal that can be used as lightning conductor is?
NH\(_4\)Cl(s) ⇌ NH\(_3\)(g) + HCl(g)
The reaction above can only attain equilibrium if
The gas that can be dried using concentrated tetraoxosulphate (VI) acid is
N\(_2\)(g) + 3H\(_2\)(g) ↔ 2NH\(_3\)(g) ΔH = - 90 kJ
In the equation above, the yield of ammonia can be decreased by
A dense white fume is formed when ammonia gas reacts with
When pure aluminium metal is heated to red hot in the presence of nitrogen gas, the compound formed is
The density of a certain gas is 1.98gdm\(^{-3}\) at s.t.p. What is the molecular mass of the gas?
What is the valence shell electron configuration of the element with atomic number 17?
I. Treatment of cancer
II. Detection of leakages in water mains
III. Detection of the ages of ancient tools
IV. Preparation of drugs
Which combination of the above refers to the uses of radioactive isotopes?
The pressure of 100cm\(^3\) of oxygen at 35\(^0\)C is 750mmHg. What will be the volume of gas if the pressure is reduced to 100mmHg without changing the temperature?
A heterogenous mixture can be defined as any mixture
An element will readily form an electrovalent compound if its electron configuration is