Answer:
(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.
"20 J" is the "Potential Energy" of "vase" on the table.
<u>Explanation</u>:
The body possess some energy according to the position of the object that is the when an object is placed at a height it stores some energy it is called "Potential Energy".
Formula used to calculate the "Potential Energy" is 
Where, "m" is mass of vase is given that 2 kg, "g" is acceleration due to gravity is 
and "h" is height of the object where it placed is 1 m.
Substitute the given values in the formula,
Potential energy of the vase = 
Potential energy of the vase = 20 J
answer : 14 J/mol
J/mol unit in the answers gives the hint as to what you should do which is divide the J from mol
J ÷ mol
84 ÷ 6 = 14
Mg+2HCl------- MgCl2 +H2
2 moles ofHCl use 1 mole of Mg
3.91 mol of HCl=1/2 *3.91
Moles of Mg used = 1.955 moles
Moles of HCl used=3.91 mol
1 mole of Mg make 1 mole of MgCl2
So moles of MgCl2=1.955 moles
Molar mass=24+ (35.5*2)
Molar mass= 95 g/ mol
Mass of MgCl2 produced=moles *molar
