Distillation and Liquation

Q. During roasting of zinc blende, it convert to.., ..................

Q. Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process. Explain using a diagram.

Q. Which of the tubes in Figure (a) and (b) will be more effective as a condenser in the distillation apparatus?
Fig(a) Fig(b)

Q.

Which of the following pair of metals is purified by van Arkel method?

1. Zr & Ti

2. Ni & Fe

3. Ga & In

4. Ag & Au

Q. Which of the tubes in Figure (a) and (b) will be more effective as a condenser in the distillation apparatus?
Fig(a) Fig(b)