Download App

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

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?4 Marks
Question
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
✓

Answer

The mixture of common salt, sand and ammonium chloride will be heated first. Ammonium chloride sublimes on heating and can be recovered in the form of sublimate by cooling its vapours leaving behind mixture of common salt and sand. Salt is soluble in water whereas sand is insoluble in water. The mixture of sand and salt is dissolved in water, then it is filtered with the help of filter paper. Sand remains as residue on the filter paper while salt solution is obtained as filtrate .The filtrate is then evaporated to get crystals of salt.

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

Define the following:
  1. Sol
  2. Aerosol
  3. Emulsion
  4. Foam
Given one example of each.
→

What are the postulates of Bohr’s model of an atom?

→
Name two types of animal feed and write their functions.
→
How can you obtain pure water from a salt-water mixture (or salt-solution)? Draw a meat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
→
Show by using the graphical method that:
$\text{s}=\text{ut}+\frac{1}{2}\text{at}^2$
where the symbols have their usual meanings.
→
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, lemon water, smell of perfume.
→
The atom of an element X contains 17 protons, 17 electrons and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons and 12 neutrons.
  1. What type of ion will be formed by an atom of element X? Write the symbol of ion formed.
  2. What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from X?
  3. What type of ion will be formed by an atom of element Y? Write the symbol of ion formed.
  4. What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from Y?
  5. What is the atomic mas of (i) X, and (ii) Y?
  6. What could the elements X and Y be?
→
Discuss the method of separating a mixture containing chalk powder, iron fillings and naphthalene.
→
State the various postulates of Dalton’s atomic theory of matter.
→
How will you separate a mixture of kerosene oil and water? Explain with the help of a labeled diagram
→