Advertisements
Advertisements
Question
Describe a method to separate a mixture of camphor and sand.
Advertisements
Solution
Sublimation method is used to separate a mixture of camphor and sand. Camphor is a volatile solid and can be separated from any other non-volatile substance by heating. Sand is a non-volatile substance. When a mixture of sand and camphor is heated, sand will remain in the container but camphor will vaporise. These vapours are collected and condensed on a cold surface.
APPEARS IN
RELATED QUESTIONS
Intermolecular space is maximum in .......... less in ............ and the least in .........
State two characteristics of matter demonstrated by Brownian motion.
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
State any two properties for believing that aluminium is a metal.
Give reason why graphite is used for making elecrode in a dry cell.
The property/properties which enable copper metal to be used for making electric wires is/are :
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Which of the following is not an emulsion ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
How will you separate a mixture of iron filings and powdered carbon ?
How is scrap iron separated from a heap of waste materials in factories?
What is chromatography ? State its two applications.
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
One of the following does not undergo sublimation. This one is :
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Define the term matter.
Why wires cannot be drawn from materials such as stone or wood?
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
