Combustion and Flame Test

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Combustion and Flame Test - 33

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Question 1
1 / -0

A paper-wrapped tightly around the joint of a brass tube and its wooden handle is put in a flame, the paper will:

A
catch fire immediately

B
not burn at any place

C
burn around the brass tube

D
burn around the wooden handle

Solution

Brass is a good conductor of heat so it will not burn in flame. But wood is a bad conductor of heat therefore paper-wrapped around the wooden handle will burn.
Hence the correct option is $$D$$.
Question 2
1 / -0

___________ component of air is the supporter of burning.

A
oxygen

B
nitrogen

C
hydrogen

D
none of these

Solution

The combustion of any substance happens in the presence of oxygen gas.Combustion reaction occurs when a substance or a chemical compound gets burnt. The reaction tends to produce heat, energy and light as products.
Question 3
1 / -0

In a Bunsen's burner, use is made of:

A
Surface tension

B
Suction Pump

C
Boyle's Law

D
Bernoulli's theorem

E
Archmedes' principle
Question 4
1 / -0

The gas used in fire extinguishers is

A
Nitrogen

B
Sulphur dioxide

C
Carbon dioxide

D
Hydrogen

Solution

Carbon dioxide gas is used in fire extinguisher to cut the oxygen supply.
Option C is correct.
Question 5
1 / -0

Directions For Questions

Place a candle in a beaker or a wide-mouthed bottle and light it. Light an incense stick (agarbati) and take it to the mouth of the beaker as shown in the figure. Note the way in which the smoke flows when the incense stick is (i) near the edge of the beaker, (ii) kept a little above the candle, and (iii) kept in other regions.

...view full instructions

What does the above experiment show ?

A
The direction of movement of hot and cold air.

B
Oxygen is present in the air and is necessary for burning.

C
The temperature of air inside the bottle is more than the temperature of open air.

D
The direction in which the maximum smoke is produced & pollutes the environment.

Solution

When you lit the candle the first time you did it in an area where the air pressure was constant, so the smoke flowed straight up. When you set the side of the pan by side, the ice-cooled the air around it, creating a mini high-pressure zone, and the sand warmed the air around it to create a mini low-pressure zone. Air always flows from a high-pressure zone to a low-pressure zone to even up the pressure. You made a tiny breeze between the pan of ice and the pan of sand, and the smoke floated sideways in the breeze. The same thing happens between cold ocean water and hot beach sand.
Air pressure changes cause wind, but they are responsible for other types of weather too. A low-pressure zone usually causes clouds and rain, because as the hot air rises it carries with it evaporated moisture that can condense into clouds. A high-pressure zone usually results in clear skies and sunny days because sinking currents prevent moisture from rising up and forming clouds.
Question 6
1 / -0

Holmes signals can be given by using:

A
$$CaC_2+Ca(CN)_2$$

B
$$CaC_2+Ca_3P_2$$

C
$$CaC_2+CaCO_3$$

D

$$Ca_3P_2+Ca(CN)_2$$

Solution

Holmes signal contains a mixture of compounds in which react with water to give fumes. One of the compounds formed during reaction with water directly ignites and another compound has a flammable characteristic.
Calcium carbide and Calcium phosphide react with water as follows.

$$CaC_2+2H_2O \rightarrow C_2H_2+Ca(OH)_2$$

$$Ca_3P_2+6H_2O \rightarrow 2PH_3+3Ca(OH)_2$$
Here acetylene is produced by the reaction of calcium carbide with water and calcium phosphide gives phosphine when reacted with water.
Phosphine gets ignited immediately when it comes in contact with air and acetylene produced by calcium phosphide is flammable and also burns. So, we get bright red-colored flames which are also followed by fumes. Hence, their mixture is used as a Holmes signal.
So, the correct option is B.
Question 7
1 / -0

Complete combustion of $$CH_{4}$$ gives:

A
$$CO_{2}+H_{2}O$$

B
$$CO_{2}+H_{2}$$

C
$$COCl_{2}$$

D
$$CO+CO_{2} + H_{2}O$$

Solution

In a combustion reaction, a substance reacts with oxygen from the air and transfers energy to the surroundings as light and heat.
The products of a complete combustion reaction include carbon dioxide($$CO_2$$) and water vapor($$H_2O$$).
$$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$$
Hence, option $$A$$ is correct.
Question 8
1 / -0

Which one of the following metal burns, if kept in air?

A
Aluminium

B
Sodium

C
Magnesium

D
None of these

Solution
Question 9
1 / -0

Fire-related deaths are mostly due to:

A
smoke inhalation

B
burns

C
presence of $$CO_2$$

D
over inhalation of nitrous oxide

Solution
Question 10
1 / -0

What is used as a fuel in jet planes?

A
Liquid Petrol

B
Diesel oil

C
Kerosene

D
LPG

Solution

Kerosene is used as a fuel in jet planes. Either an unleaded kerosene or a naphtha-kerosene blend is used.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 33

Result

Combustion and Flame Test - 33

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SHARING IS CARING

Question 1

catch fire immediately

not burn at any place

burn around the brass tube

burn around the wooden handle

Solution

Question 2

oxygen

nitrogen

hydrogen

none of these

Solution

Question 3

Surface tension

Suction Pump

Boyle's Law

Bernoulli's theorem

Archmedes' principle

Question 4

Nitrogen

Sulphur dioxide

Carbon dioxide

Hydrogen

Solution

Question 5

The direction of movement of hot and cold air.

Oxygen is present in the air and is necessary for burning.

The temperature of air inside the bottle is more than the temperature of open air.

The direction in which the maximum smoke is produced & pollutes the environment.

Solution

Question 6

$$CaC_2+Ca(CN)_2$$

$$CaC_2+Ca_3P_2$$

$$CaC_2+CaCO_3$$

$$Ca_3P_2+Ca(CN)_2$$

Solution

Question 7

$$CO_{2}+H_{2}O$$

$$CO_{2}+H_{2}$$

$$COCl_{2}$$

$$CO+CO_{2} + H_{2}O$$

Solution

Question 8

Aluminium

Sodium

Magnesium

None of these

Solution

Question 9

smoke inhalation

burns

presence of $$CO_2$$

over inhalation of nitrous oxide

Solution

Question 10

Liquid Petrol

Diesel oil

Kerosene

LPG

Solution

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