Question

Fill in the blanks by choosing an appropriate option.
When sugar is dissolved in water, it undergoes a ___(i)___ change but if sugar is heated in a test tube over the Bunsen burner flame, it first melts, turns brown and finally turns ___(ii)___. The new substance formed is ___(iii)__ and the change is a ____(iv)____ change.

• A. (i) - Physical reversible, (ii) - Black, (iii) - Charcoal, (iv) - Chemical irreversible
• B. (i) - Physical irreversible, (ii) - Black, (iii) - Coal, (iv) - Chemical irreversible
• C. (i) - Physical irreversible, (ii) - Red, (iii) - Charcoal, (iv) - Chemical reversible
• D. (i) - Physical reversible, (ii) - Red, (iii) - Coal, (iv) - Chemical reversible

Answer 1

The correct option is A (i) - Physical reversible, (ii) - Black, (iii) - Charcoal, (iv) - Chemical irreversible

Dissolving sugar in water is a physical, reversible change. When sugar is heated, it decomposes into carbon and water (chemical reversible change).
$C_{12}{H}_{22}{O}_{11}\to C+H_{2}O$
Carbon (Steam)