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)
(ii)
(iii)
(iv)
Physical, reversible
Black
Charcoal
Chemical, irreversible
B)
(i)
(ii)
(iii)
(iv)
Physical, irreversible
Black
Coal
Chemical, irreversible
C)
(i)
(ii)
(iii)
(iv)
Physical, irreversible
Red
Charcoal
Chemical, reversible
D)
(i)
(ii)
(iii)
(iv)
Physical, reversible
Red
Coal
Chemical, reversible
Correct Answer: A
Solution :
Dissolving sugar in water is a physical, reversible change. When sugar is heated, it decomposes into carbon and water (chemical reversible change). \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\xrightarrow{\Delta }\underset{\begin{smallmatrix} Carbon \\ (Charcoal) \end{smallmatrix}}{\mathop{C} \,+\underset{(Steam)}{\mathop{{{H}_{2}}O}}\,\]You need to login to perform this action.
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