Liquids and Solids

Liquids and Solids - 10

1. Ethanol is much more soluble in water than is ethyl ethanoate which one of the following statement correctly account for this.

a) A hydrogen bond is formed between the H-atom of the –OH group in ethanol and hydrogen of a water molecule.
b) Ethanol is non-polar molecule, but ethyl ethamoate is polar.
c) A hydrogen bond forms, between the H-atom of the-OH group in ethanol and O-atom of a water molecule.
d) Ethanol is a polar molecule, but ethyl ethanoate is non-polar

2. The diagram below represent the unit cell of body-centered cubic structure. How many atoms are there per unit cell.

a) 3
b) 2
c) 5
d) 9

3. The b.p of a liquid will be

a) same as at sea level and high altitudes.
b) Higher at high altitudes
c) Lower at high altitudes.
d) equal to atmospheric pressure.

4. Why is the b.p of methane greater than that of neon.

a) The molecule of methane is polar but than of neon is not
b) A molecule of methane has more electrons than a molecule of neon.
c) A molecule of methane has a greater mass than a molecule of neon
d) Molecules of methane have stronger inter molecular force that those of neon

5. Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization.

a) Silicon
b) Argon
c) Chlorine
d) Phosphorous

6. Compstals show variation in physical prosperities depending upon the direction. This property is called.

a) Anisotropy
b) Isotropy
c) Isomorphison
d) Polymorph son

7. Certain solids melt to a turbid liquid phase with properties of liquids as well as some degree of order like solid. Such turbid liquids are called.

a) Crystalline solids
b) Amorphous solid
c) Vitious Solid
d) liquid crystal

8. Isomorphic crystals show.

a) Same physical properties
b) same crystalline form
c) same melting point.
d) Same chemical properties.

9. Existence of an element in more than one form is known as.

a) None of these.
b) Isotropy
c) Allotrophy
d) Isomorphism

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