0.08\(gdm^{-3}\)
2.00\(gdm^{-3}\)
8.00\(gdm^{-3}\)
80.00\(gdm^{-3}\)
Correct answer is B
1000\(cm^{3}\) = 1\(dm^{3}\)
200\(cm^{3}\) = 0.2\(dm^{3}\)
⇒ 0.2\(dm^{3}\) contains 0.4g
hence, solubility of the salt which is the amount of the salt dissolvable in 1\(dm^{3}\) is
\(\frac{0.4g}{0.2dm^{3}} = 2.0gdm^{-3}\)
The process of extraction of iron from its ore is
decomposition
oxidation
reduction
sublimation
Correct answer is C
The Iron is to to be gotten by the removal of oxygen from its ore, and this is called a reduction reaction.
Which of the following equations represents a redox reaction?
\(HNO_{{3}{(aq)}} + NaOH_{(aq)} \to NaNO_{{3}{(aq)}} + H_{2}O_{(l)}\)
\(AgNO_{{3}{(aq)}}+KCl_{(aq)} \to AgCl_{(s)}+KNO_{{3}{(aq)}}\)
\(CaCO_{{3}{(s)}} \to CaO_{(s)} + CO_{{2}{(g)}}\)
\(2H_{2}S_{(s)} + SO_{{2}{(g)}} \to 2HO_{2} + 3S_{(g)}\)
Correct answer is D
No explanation has been provided for this answer.
Which of the following raw materials is used in the plastic industry?
Ethene
Methane
Sulphur
Hydrogen
Correct answer is A
Ethene is the most important organic chemical, by weight, that is manufactured. It is an important raw material for the production of plastics and antifreeze solutions as well as solvents.
The process that occurs when two equivalent forms of a compound are in equilibrium is
Isotopy
Resonance
Isomerism
Reforming
Correct answer is B
Resonance involves two forms of a compound.
Isomerism involves two or more forms of an element.
Reforming involves the rearrangement of molecule.
This deals with a two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure.