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No verified paper has been uploaded for PPSC-PMS Paper Chemistry 2005 MCQs yet. The MCQs below are drawn from the Chemistry subject category.
The Bosch process is a method used to separate hydrogen gas from water by electrolysis, where water is split into hydrogen and oxygen using an electric current.
Organic compounds with negligible polarity and weak intermolecular forces generally have lower melting points. This is because these compounds do not require much energy to break the weak forces between their nonpolar molecules, resulting in lower melting points compared to compounds with stronger intermolecular forces like hydrogen bonds.
Viscosity refers to a fluid's resistance to flow. Honey has the largest molecules and strongest intermolecular forces, making it the thickest and most difficult to pour.
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Aromatic hydrocarbons, such as benzene, burn with a smoky flame due to their higher carbon-to-hydrogen ratio, which leads to incomplete combustion and the formation of soot.
The pH of pure water at 25°C is neutral, meaning it has equal concentrations of hydrogen and hydroxide ions. With a kw of 1×10^(-14), the pH is 7, which is the neutral point on the pH scale. This is because pH is defined as the negative logarithm of the hydrogen ion concentration, and in pure water, this concentration is 10^(-7) M, corresponding to a pH of 7.
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The number of C atoms in homologous series increases gradually. Van der Waal`s force increases as the molecules get bigger. Hence, the melting and boiling points of the members of homologous series increase gradually because their molecular masses increase.
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