Download App

Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
Salt can be obtained by ___________ of sea water:
  • A
    Sublimation
  • B
    Cooling
  • ✓
    Evaporation
  • D
    Heating
✓

Answer

Correct option: C.
Evaporation

On evaporation of seawater in shallow pools, salt along with impurities remain behind. Impured salt is taken in a tank and its saturated solution is prepared. In a saturated solution of salt, $HCl$ vapors are passed. Chloride ions being common to both, its concentration increases, and $NaCl$ gets precipitated which is free from impurities.

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 "MCQ (1 Marks)" from Physical and Chemical Changes→Physical and Chemical Changes — all question types→Science STD 7 question papers→Gujarat Board STD 7 question papers→Gujarat Board question paper generator→

Similar questions

The range of clinical thermometer is:
→
An example of chemical change is:
→
Which set of substances is not used for making fibres?
→
Paheli Is Writing Some Statements. She Wants To Know In Which Of The Following Statements Is Or Are Incorrect?
→
Which of the following has the strongest stem?
→
A resource much needed for soil is:
→
Which of the following instruments is used to measure rainfall?
→
When the soil is too basic, plants do not grow well in it. To improve its quality, what must be added to the soil?
→
Which of the following is not required for photosynthesis:
→
The swallowed food moves downwards in the alimentary canal because of
→