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3142
Which type of hydrocarbons produce a smoky flame when burned?
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.
3143
What is the pH of pure water at 25°C, given that the water dissociation constant (kw) is 1×10^(-14)?
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.
3144
Centrifugal forces are balanced in atom by__________________?
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3145
Which of the following is the Radioactive isotope of Hydrogen?
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3146
In a homologous series, increase in melting point can be seen with increase in
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.
3147
Which of the following has at least one hydrogen atom or two hydrogen atoms attached to the carbonyl carbon atom?
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3148
What type of attractive forces can exist between any atoms and molecules?
Van der Waal forces are weak attractive forces that can exist between all kinds of atoms and molecules, regardless of their polarity. They are responsible for the physical properties of substances, such as melting and boiling points.
3149
The pH (power of Hydrogen) value of black coffee is
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3150
Which statement is not true regarding the van der Waals equation?
The van der Waals equation accounts for intermolecular forces and molecular volume. At high densities, the equation actually deviates more significantly from ideal gas behavior, not reduces to it, because the assumptions of the ideal gas law are less valid.
