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The valence electrons of \(_{12}Mg\) are in the
The preferential discharge of ions during electrolysis is influenced by the
When substance X was added to a solution of bromine water, the solution became colourless. X is likely to be
When a salt is added to its saturated solution, the salt
At what temperature does the solubility of \(KNO_{3}\) equal that of \(NaNO_{3}\)?
Pure water can be made to boil at a temperature lower than 100°C by
What is the mass of solute in 500\(cm^{3}\) of 0.005\(moldm^{-3}\) \(H_{2}SO_{4}\)? ( H = 1, S = 32.0, O=16.0)
Consider the following equilibrium reaction: \(2AB_{{2}{(g)}} + B_{{2}{(g)}} \to 2AB_{{3}{(g)}}\). \(\Delta H= -X kJmol^{-1}\). The backward reaction will be favored by
Ethene is produced from ethanol by
Consider the following reaction equation: \(Br_{2} + 2KI \to 2KBr + I_{2}\). Bromine is acting as
An organic compound has the empirical formula \(CH_{2}\). If its molar mass is 42\(gmol^{-1}\), what is its molecular formula? (C = 12.0, H = 1.0)
In which of the following compounds does hydrogen form ionic compounds?
A reaction is endothermic if the
An acidic salt has
What is the solubility of a salt if 0.4g of it is obtained on evaporating 200\(cm^{3}\) of its saturated solution to dryness?
The process of extraction of iron from its ore is
Which of the following equations represents a redox reaction?
Which of the following organic compounds can undergo both addition and substitution reactions?
Which of the following raw materials is used in the plastic industry?
Petroleum is a non-renewable source of energy because it