States of Matter: Gases and liquids Test

Result

States of Matter: Gases and liquids Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

The Van der Waals forces that come into play between two helium atoms are:

A
dipole – dipole interactions

B
induced dipole – induced dipole interactions

C
ion – ion interactions

D
ion – dipole interactions

Solution

Induced dipole – induced dipole interactions come into play among the atoms when a dipole is momentarily established in an atom and induces a dipole on the other neighbouring atoms.
Question 2
1 / -0

Molecules of HCl are attracted by

A
dipole – dipole interactions

B
London's dispersion forces

C
ion – dipole interactions

D
Both (1) and (2)

Solution

HCl is a permanent dipole and there exist both dipole – dipole interactions and induced dipole – induced dipole interactions between the molecules.
Question 3
1 / -0

If at a constant temperature, the volume of a gas is decreased by 10%, then the final pressure should be

A
increased by 5.26%

B
decreased by 5.26%

C
decreased by 11%

D
increased by 11%

Solution

At constant temperature:
P₁V₁ = P₂V₂
P₁V₁ = P₂ (90/100) V₁ ( V₂ = 90% V₁)
Therefore, P₂ = 1.11 P₁
= P₂ = (P₁ + 0.11 P₁)
= P₁ + 11% P₁
Therefore, final pressure is increases by 11%.
Question 4
1 / -0

The phenomenon that can be explained with the help of Boyle's law is

A
the bursting of the tyre of an automobile due to extreme heat

B
the principle of hot air balloons

C
the thining of the atmosphere at higher altitudes

D
the expansion of a ballon on pumping air into it

Solution

The air expands and becomes thin at higher altitudes due to the decrease in the atmospheric pressure.
Question 5
1 / -0

If the volume of a balloon containing 44 g CO₂ doubles by pumping 32 g of oxygen into it, then which gas law is being demonstrated?

A
Boyle's Law

B
Charle's Law

C
Avogadro's Law

D
Gay Lussac's Law

Solution

Avogadro's law states that at a constant temperature and pressure: Vαn
The volume doubles when the number of moles is doubled.