Combustion And Flame Test

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Combustion And Flame Test - 2

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Question 1
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Directions For Questions

Read the two statements given below and select the correct option accordingly.

...view full instructions

Statement I: Air supports the combustion process.
Statement II: Air is a homogeneous mixture of gases with 78% nitrogen and nearly 21% oxygen.

A
Both statements I and II are correct, and statement II is the correct reason for statement I.

B
Both statements I and II are correct, but statement II is not the correct reason for statement I.

C
Statement I is correct, but statement II is incorrect.

D
Both statements I and II are incorrect.

Solution

Both statements I and II are correct, and statement II is the correct reason for statement I.
Since air is a mixture, its components retain their characteristic properties.

Hence, oxygen present in the air supports combustion.
Question 2
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Consider the following statements about the combustion of fuels:

(i) Combustion of fuels occurs in the presence of oxygen.
(ii) Combustion is a slow process.
(iii) It requires an external source of ignition.
(iv) This process usually takes place at room temperature.

Which of the above statements are not correct?

A
Only (i) and (ii)

B
Only (ii) and (iv)

C
Only (iii) and (iv)

D
Only (i) and (iv)

Solution

The statements (ii) and (iv) are incorrect, because combustion is a fast process and fuels have to be heated to their ignition temperature before they start burning.
Question 3
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Which among the following are released during the process of combustion of fuels?

A
Energy + Carbon dioxide

B
Energy + Carbon dioxide + Water vapour

C
Energy + Oxygen + Water vapour

D
Energy + Water vapour

Solution

When hydrocarbons are burned as fuels, carbon dioxide and water are produced as combustion products along with the release of enormous amount of energy.

Moreover, since the temperature of the reaction mixture is above 373K, the water formed is in the vapour form.

Hydrocarbons (g) + O₂(g) → CO₂(g) + H₂O (g) + Energy

Question 4

1 / -0

Match the combustion processes in Column I with the types of combustion in Column II.

Column I	Column II
I. A piece of phosphorus bursting into flames on its own	(i) Rapid combustion
II. Bursting of a cracker	(ii) Spontaneous combustion
III. Lighting of an LPG burner	(iii) Explosion

I - (iii), II - (ii), III - (i)

I - (ii), II - (iii), III - (i)

I - (iii), II - (i), III - (ii)

I - (ii), II - (i), III - (iii)

Solution

The correct match is: I - (ii), II - (iii), III - (i)

Column I	Column II
I. A piece of phosphorus bursting into flames on its own	(ii) Spontaneous combustion
II. Bursting of a cracker	(iii) Explosion
III. Lighting of an LPG burner	(i) Rapid combustion

Question 5
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Which of the following chemical substances are the components of a matchstick head and which are present on the striking surface (Side of the match box)?

(I) Antimony trisulphide
(II) Potassium chlorate
(III) Red phosphorus
(IV) Powdered glass

A
(I) and (IV) on the match stick head; (II) and (II) on the match box.

B
(II) and (III) on the match stick head; (I) and (IV) on the match box.

C
(III) and (IV) on the match stick head; (I),(II) and (III) on the match box.

D
(III) and (IV) on the match stick head; (I) and (II) on the match box.

Solution

The tip of a matchstick: Potassium chlorate (an oxidant), Antimony trisulphide (Source of sulphur), starch, glue and some other ingredients
Striking surface (Matchbox sides): Red phosphorus, powdered glass, and glue
Question 6
1 / -0

Which of the following fuels has the highest calorific value?

A
Wood

B
Kerosene

C
LPG

D
Hydrogen

Solution

Hydrogen has the highest calorific value, which is why it is used as a rocket fuel.
Question 7
1 / -0

A good fuel should have

A
a high ignition temperature

B
a low ignition temperature

C
a very low ignition temperature

D
a variable ignition temperature according to the weather conditions

Solution

A good fuel should have a low ignition temperature, but it should be safely above the room temperature.
This is important so that the fuel is safe to store.

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Combustion And Flame Test - 2

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Combustion And Flame Test - 2

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Question 1

Both statements I and II are correct, and statement II is the correct reason for statement I.

Both statements I and II are correct, but statement II is not the correct reason for statement I.

Statement I is correct, but statement II is incorrect.

Both statements I and II are incorrect.

Solution

Question 2

Only (i) and (ii)

Only (ii) and (iv)

Only (iii) and (iv)

Only (i) and (iv)

Solution

Question 3

Energy + Carbon dioxide

Energy + Carbon dioxide + Water vapour

Energy + Oxygen + Water vapour

Energy + Water vapour

Solution

Question 4

I - (iii), II - (ii), III - (i)

I - (ii), II - (iii), III - (i)

I - (iii), II - (i), III - (ii)

I - (ii), II - (i), III - (iii)

Solution

Question 5

(I) and (IV) on the match stick head; (II) and (II) on the match box.

(II) and (III) on the match stick head; (I) and (IV) on the match box.

(III) and (IV) on the match stick head; (I),(II) and (III) on the match box.

(III) and (IV) on the match stick head; (I) and (II) on the match box.

Solution

Question 6

Wood

Kerosene

LPG

Hydrogen

Solution

Question 7

a high ignition temperature

a low ignition temperature

a very low ignition temperature

a variable ignition temperature according to the weather conditions

Solution

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