Which of the following statements is predicted to be false?
(a) an aqueous solution of CaCl2 exhibits ion-dipole forces between solute and solvent
(b) an aqueous solution of ethanol exhibits H-bonding forces between solute and solvent
(c) an aqueous solution of CO2 exhibits dipole-dipole forces between solute and solvent
(d) an aqueous solution of O2 exhibits dipole-induced-dipole forces between solute and solvent
(e) a solution of toluene (C7H8) in benzene (C6H6) exhibits only dispersion forces between solute and
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Ответ:
(c) an aqueous solution of CO2 exhibits dipole-dipole forces between solute and solvent
Explanation:
Co2 is a non-polar molecule.
It is actually shown to be O=C=O.
When dissolved in water to get aqueous solution.
Dipole on water molecule can induce dipole on CO2.
This entails that we should have dipole-induced dipole forces when we have a mixture or solvent and solute.
But the given statement states dipole dipole forces between solute and solvent.
Hence the statement is false.
Ответ:
Answer : The correct option is, melting tin and then cooling it into a mold.
Explanation :
Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance. It is an irreversible reaction.
Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming. It is a reversible reaction.
(1) Cutting a gold bar in two pieces and then putting the pieces next to each other : It is a physical change because only changes takes place in the shape or size of the substance but it can not be reversible.
(2) Burning a match and then relighting it : It is a chemical change because in this process, chemical reaction takes place by burning that means changes occurs in the chemical composition and new compound is formed.
(3) Melting tin and then cooling it into a mold : It is a physical change and a reversible process because in this process, only phase changes and it can also be reversible by again melting process.
(4) Combining sodium and chlorine to make the new material of table salt : It is a chemical change because in this process, chemical reaction takes place that means changes occurs in the chemical composition and new compound is formed.
Hence, the correct option is, melting tin and then cooling it into a mold.