Download App

Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
MCQ
While forming crystals, it is important to:
  • A
    Evaporate to dryness to get purest possible crystals.
  • B
    Attach gas syringes to collect fumes.
  • ✓
    Not evaporate water of crystallization.
  • D
    Use high flames.
✓

Answer

Correct option: C.
Not evaporate water of crystallization.
Crystals contain water of crystallization hence during the formation of crystals water of crystallization should not be evaporated. Also, crystallization is the process of the formation of crystals. Crystals are defined as highly organized molecules into a well$-$known structure.

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 blood vessels which carry oxygen –rich blood from the heart to all parts of the body are called.
→
A bus travels $54\ km$ in $90$ min. The speed of the bus is:
→
The walls of large intestine absorb:
→
The process of soil formation accelerate by
→
Silk and woolen clothes are often damaged by:
→
Who Invented Thermos Flask?
→
Which Of The Following Statement$(S)$ Is Or Are Correct?
→
Baking of dough into bread is a kind of change:
→
How is oxygen replenished in nature?
→
What additional nutrients is likely to be produced by plants, when the soil contains abundant nitrogen-fixing bacteria during photosynthesis?
→