Correct Answer: 6

Water molecules are attracted to solid surfaces by various types of London-van der Waals forces. These are strong, but very short-range forces; they diminish with about the sixth power of the distance.

Which of the following of a protein molecule determines the strength of van der Waals force?

The molecular weight of the protein

PI of the protein

Number of amino acids present

The surface area of the molecule

Real gases conform more closely with the van der Waals equation of state than the ideal gas equation of state.

true

false

The value of compressibility factor at the critical state for a van der Waals gas is

0.325

0.350

0.375

0.400

A van der Waals bond is a _________ bond.

Primary

Secondary

Tertiary

Quaternary

For the Van der Waals real gas equation Statement I: The unit of constant a is atm.L2/mole2 Statement II: The unit of constant b is L

Both statements are false

Only one can be true at a time

Both statement are true

None of the mentioned

Van der Waals forces are the only attractive forces present in nonpolar compounds.

True

False

In physical adsorption the enzymes are attached to the matrix through hydrogen bonding, van der Waals forces, or hydrophobic interactions; whereas in ionic bonding, the enzymes are bound through?

Hydrophilic linkage

Di-sulphide bonding

Salt linkages

Cross-linking

What are the units of “b” in van der Waals equation?

L/mol

L mol

1/L mol

The solid phase of an element follows van der Waals bonding with inter-atomic potential $$V\left( r \right) = - \frac{P}{{{r^6}}} + \frac{Q}{{{r^{12}}}}$$ where, P and Q are constants. The bond length can be expressed as

$${\left( {\frac{{2Q}}{P}} \right)^{ - 6}}$$

$${\left( {\frac{Q}{P}} \right)^{ - 6}}$$

$${\left( {\frac{P}{{2Q}}} \right)^{ - 6}}$$

$${\left( {\frac{P}{Q}} \right)^{ - 6}}$$

The internal pressure of a van der Waals gas is

independent of the molar volume

inversely proportional to the molar volume

inversely proportional to square of the molar volume

directly proportional to the molar volume