Free Liquids MCQs with Answers

• A. Water
• B. Mercury
• C. Ethyl alcohol
• D. Chloroform
• E. Benzene

Explanation: The correct answer is Mercury (Option B). Mercury has the highest surface tension because of the strong cohesive forces between its metal…

• A. Boiling
• B. Freezing
• C. Clearing
• D. All of these options are correct

Explanation: A liquid crystalline state is a state of matter that acts both like a liquid and a solid.

• A. -4 C
• B. - 1 C
• C. 0 C
• D. 4 C

Explanation: As density is inversely proportional to the volume, the density of water increases when the temperature is lowered.

• A. Higher than water
• B. Lower than water
• C. Similar to water
• D. Higher than 1.59/cm3

Explanation: The density of ice is lower than water. The density of water is 1.000 g/cm3 at 0°C, while the density of ice is 0.917 g/cm3 at 0°C.

• A. 273K
• B. 373K
• C. 277K
• D. 509K

Explanation: This is equal to 4 degree celsius mentioned in punjab book page 87 under structure of ice.

• A. 0°C
• B. 2°C
• C. 4°C
• D. 100°C

Explanation: Water has its maximum density at 4°C because hydrogen bonding produces an open structure near freezing, while warming from 0°C to 4°C…

• A. n-pentane
• B. Iso-pentane
• C. Neo-pentane
• D. All same

Explanation: The intermolecular forces in n-pentane are STRONGER than those in isopentane and neopentane.

• A. Increase
• B. Decrease
• C. Constant
• D. Unknown

Explanation: When a liquid is heated, the kinetic energy of its molecules increases and hence the temperature also increases.

• A. Polar nature of water
• B. H-bonding
• C. Electronegativity difference
• D. All are correct

Explanation: Water is considered a universal solvent due to its multiple properties.

• A. Hydrogen bonding
• B. Dipole-dipole forces
• C. London dispersion forces
• D. Dipole-induced dipole

Explanation: Force of attraction present between all kind of atoms and molecules are known as London dispersion forces.

• A. H-bonding
• B. Ionic bonding
• C. Covalent bonding
• D. Metallic bonding

Explanation: Two ice cubes can unite to form one cube when they are pressed against each other due to Hydrogen bonding.

• A. H 2(s)
• B. I 2(s)
• C. Cl 2(g)
• D. CH 4(g)

Explanation: CH4 has largest intermolecular attraction because as it form sp3 hybridization in which bond energy is greater

• A. 9
• B. 6.5-7
• C. 8
• D. 12

Explanation: Fresh milk is slightly acidic, with a normal pH close to 6.5 to 6.7, mainly because of dissolved carbon dioxide, phosphates and lactic…

• A. It expands on heating
• B. It contracts on heating
• C. Both
• D. None

Explanation: If we take some water at 0 C and start heating it, we find that in the temperature range 0oC to 4oC, it contracts instead of expanding.on…

• A. 2.98˚C
• B. 3.98 ˚C
• C. 4 ˚C
• D. 4.98 ˚C

Explanation: The maximum density of water is at 4°C as there are two opposite effects that are in balance.

• A. 2°C
• B. 4°C
• C. 0°C
• D. <0°C

Explanation: When water is at 0 ° C , it takes a cage-like structure, and thus the volume increases which results in the density decrease.

• A. Molar heat of fusion
• B. Molar heat of vapourization
• C. Molar heat of sublimation
• D. Molar heat of Evaporation

Explanation: Option A is incorrect since the molar heat of fusion is the amount of heat required to convert one mole of a substance from the solid to…

• A. Is very volatile
• B. Highly soluble in water
• C. Forms boiling mixture
• D. Forms saturated at this concentration

Explanation: When the concentration of HCl gas in water is 22.2% by weight, it forms a constant boiling mixture.At this concentration, if dilute HCl is…

• A. Acetone
• B. Ethanol
• C. Water
• D. Ethylene glycol

Explanation: Acetone evaporates much faster than water, even though its molecular mass is more than three times as much.

• A. Temperature
• B. Intermolecular forces
• C. Density of liquid
• D. Surface area of liquid

Explanation: Vapour pressure is independent of the surface area of liquid.