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Standard VIII
Chemistry
Zones of Candle Flame
Question

Unburnt carbon particles are present in the:
  1. Blue zone
  2. Non-luminous zone
  3. Luminous zone
  4. Dark inner zone

A
Blue zone
B
Non-luminous zone
C
Dark inner zone
D
Luminous zone
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Solution
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The circular dark ring is formed on the slide is due to the deposition of unburnt carbon particles present (middle) in the luminous zone of the candle.

Option C is correct.

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Q1
Match column 'A' with column 'B', concerning the characteristics of a flame and its zones.
'A''B'
a. Dark inner zone1. Hottest part (No carbon)
b. Blue zone2. Partial combustion
c. Luminous zone3. Unburnt vapours of wax
d. Non-luminous zone4. Complete combustion

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Q2
Unburnt carbon particles are present in the:
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Q3
Which zone in a candle flame gives out the maximum light?
(a) dark zone
(b) non-luminous zone
(c) blue zone
(d) luminous zone
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Q4
The hottest zone of a candle flame is
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(b) luminous zone.
(c) dark zone.
(d) blue zone at the base of the wick.
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Q5

Unburnt carbon particles cause-


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