Combustion of Alkynes

Q.

What is an oxyacetylene flame?

Q. ____ is used in the oxyacetylene flame which is used for the welding of metals.

1. Methyne
2. Ethyne
3. Propene
4. Ethene

Q.

The fuel used for welding metals is a mixture of:

1. Ethyne and oxygen

2. Ethyne and hydrogen

3. Ethyne and carbon dioxide

4. Ethyne and nitrogen

Q.

Oxyhydrogen flame is used for welding and cutting metals. give reasons?

Q.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and coloured. Name a non-metal which is required for combustion.

Q. (b) State one use of acetylene.​

Q.

Oxy-hydrogen flame is used for cutting and welding metals and glass.

1. True
2. False

Q.

$KMn{O}_4$ will oxidize acetylene to

1. Ethylene glycol

2. Ethyl alcohol

3. Oxalic acid

4. Acetic acid

Q.

what is an oxyacetylene flame and what are its uses

Q.

State one property of hydrogen due to which it is used in oxyhydrogen flame.

Q.

The ------------------ flame is used for the cutting and welding metals.

Q.

Sate one property of hydrogen due to which it is used in welding.

Q. Which properties of sand makes it fit for use as sand bath during roasting?

1. Low thermal capacity and non-combustible.
2. High thermal capacity and non-combustible
3. High thermal capacity and combustible.
4. Low thermal capacity and combustible.

Q. Acetylene (ethyne) burning in oxygen to give carbon dioxide and steam. The balanced reaction is:

1. $2C_2{H}_2+3O_2\to 4C{O}_2+2H_{2}O$
2. $C_2{H}_2+5O_2\to 4C{O}_2+2H_{2}O$
3. $2C_2{H}_2+5O_2\to 4C{O}_2+2H_{2}O$
4. $2C_2{H}_2+5O_2\to 3C{O}_2+2H_{2}O$

Q.

What is oxyacetylene flame ? State its use.

Q. Combustion of alkynes is an exothermic process.

1. True
2. False

Q.

$KMn{O}_4$ will oxidize acetylene to

1. Ethylene glycol

2. Ethyl alcohol

3. Oxalic acid

4. Acetic acid

Q.

___ is mixed with air or oxygen to be used for welding for cutting metals.

1. Hexane

2. Ethyne

3. Propene

4. Ethene

Q. Oxygen is necessary for combustion of alkynes.

1. False
2. True

Q.

___ is mixed with air or oxygen to be used for welding for cutting metals.

1. Ethyne

2. Ethene

3. Hexane

4. Propene