Download App

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

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?1 Mark
MCQ
Naphthalene can be separated for sand:
  • ✓
    By sublimation.
  • B
    By distillation.
  • C
    By crystallisation.
  • D
    By using water as solvent.
✓

Answer

Correct option: A.
By sublimation.
Naphthalene sublimes on heating, whereas sand does not. So, when the mixture is heated, solid naphthalene turns into vapours, which can be condensed. Sand remains in the container.

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 "M.C.Q. [1 M]" 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

The time taken to complete one oscillation is called.
→
Cylindrical muscle fibres which show alternate light and dark bands are:
→
The science of classification is called:
→
The slope of the distance$-$time graph is:
→
A student wants to have $3.011 \times 10^{23}$ atoms each of magnesium and carbon elements. For this purpose, he will have to weigh:
→
Hotspots of biodiversity means:
→
Select the incorrect differences between collenchyma and scierenchyma.
Original length of strip (mm)Final length of strip (mm)
(i)It is made up of dead cells.Its cells are living
(ii)Lumen or cell cavity is wide.Lumen or cell cavity is usually narrow.
(iii)It provides hardness to the region where it occurs.It keeps the organ soft.
(iv)Wall thickening is not uniform.Wall thickening is uniform.
(v)Pits are simple and straight.Pits are simple, oblique and may be branched.
→
$ \text{AIDS}$ is due to:
→
In a sample of ethyl ethanoate $\ce{(CH_3COOC_2H_2)},$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
→
The gravitational attraction between the two bodies increases when their masses are:
→