Questions
Questions
QUESTIONS
1. Solubility of a solid depends on which of the following factors?
The kind of solid
II. Pressure
Temperature
IV. The kind of solvent
I-III
B) II-III
C) III-IV
D) I-II-III
E) I-III-IV
Which of the following effects increase the rate of dissolving of sugar in water?
I. To grind the sugar
II. To apply pressure on water
III. To stir sugar
IV. To heat water
A) Only I
B) I-II
C) II-III
D) I-II-IV
E) I-III-IV
3. You boil away a clear liquid until a solid remains. What can you say about this liquid?
A) It is a suspension
B) It is a solution
C) It is a emulsion
D) It is a pure liquid
E) It is a heterogenous mixture
4. I. Water dissolves table salt but does not dissolve iodine and naphthalene
II. Carbon tetrachloride dissolves iodine and naphthalene but does not dissolve table salt
According to given information which of the following mixtures can be separated either by using water or by using carbon tetrachloride?
I. Table salt-iodine
II. Table salt- naphthalene
III. Naphthalene-iodine
A) Only I
B) Only II C) I and II
D) II and III
E) I,II and III
5. A mixture which contains iron fillings, naphthalene, sugar and salt is separated into its components. What is the correct order of the separation methods?
I. Filtration
II. Fractional crystallization
III. Dissolving in water
IV. Separation by using a magnet
A) I-II-III-IV
B) IV-III-I-II
C) IV-III-II-I
D) I-III-IV-II
E) III-I-IV-II
6. At 25 0C X is solid, Y and Z are liquids.
X is dissolved in Y but does not dissolve in Z.
Y and Z mixture is homogenous.
According to the given information:
I. Y and Z mixture can be separated by the use of density difference
II. X-Z mixture can be separated by filtration.
III. X–Y mixture can be separated by the difference in density.
which of the above statements are correct?
A) Only I
B) Only II
C) I-III
D) II-III
E) I,II and III
1. How would you separate a mixture containing nickel dust, pieces of straw and sand. Write step by step.
2. Describe two methods for the separation of rice and naphthalene mixture other than picking up and sieving. (Naphthalene is less dense than water and insoluble in it)
Substance
Melting Point (0C)
Boiling Point (0C)
3. Melting and boiling points of four substancese given below.
A) Which substance(s) would be liquid at 25 (0C)?
B) Which solid-solid mixture at room temperature can be separated by the use of