| I. Yellow flames are ideal for heating. |
| II. The substances which vaporise during burning give flames. |
| III. Luminous zone contains unburnt carbon particles. |
| IV. The non-luminous zone has highest temperature. |
A) I, II and III
B) I, II and IV
C) II, III and IV
D) I, III and IV
Correct Answer: C
Solution :
Blue flame is much hotter than yellow flame. Yellow flame is not hot enough and it will leave blackish ring at the bottom of the substance on heating.
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