Download App

Is Matter Around Us Pure? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?4 Marks
Question
How will you separate camphor, common salt and iron nails from their mixture?
✓

Answer

A horse-shoe magnet is moved on the surface of the mixture of camphor, common salt and iron nails. The iron nails are attracted by the magnet, they cling to the poles of the magnet and get separated. This process is repeated a number of times till complete separation of iron nails occur leaving behind mixture of camphor and common salt. Mixture of camphor and common salt is heated. Camphor sublimes on heating leaving behind common salt and can be recovered in the form of sublimate by cooling its vapours.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 4 Mark )" from Is Matter Around Us Pure?→Is Matter Around Us Pure? — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one:
  1. Having no fixed shape and no fixed volume?
  2. Having a fixed volume but no fixed shape?
  3. Having the same composition as that on the moon?
  4. Having a fixed shape and a fixed volume?
→
A car is travelling at 20m/s along a road. A child runs out into the road 50m ahead and the car driver steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the child?
→
How will you separate the components of a mixture containing two miscible liquids? Give experimental details.
→
Write down symptoms of sick animals. Discuss any two diseases of cattle.
→
State and explain Newton’s second law of motion.
→
A bullet of mass 15g has a speed of 400m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
→
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has a larger kinetic energy?
→
How many grams of magnesium will have the same number of atoms as 6 grams of carbon?
(Mg = 24u; C = 12u)
→
Write the formulae of the following compounds. Also name the elements present in them.
  1. Water.
  2. Ammonia.
  3. Methane.
  4. Sulphur dioxide.
  5. Ethanol.
→

Two objects having equal masses are moving with uniform velocities of 2m/s and 6m/s respectively. Calculate the ratio of their kinetic energies.

→