What happens when fire reacts with pure oxygen?

What happens when fire reacts with pure oxygen?
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It burns faster (and hotter).
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Pick out the wrong statement. (A) Theoretical flame temperature is the temperature attained by the products of combustion, when the fuel is burned without loss or gain of heat (B) Burning the fuel with theoretically required amount of pure oxygen results in attainment of maximum adiabatic flame temperature (C) Burning the fuel with excess pure oxygen results in maximum theoretical flame temperature (D) Adiabatic flame temperatures of actual combustions are always less than the maximum values

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Ignition temperature of a fuel in air is __________ that in pure oxygen. (A) More than(B) Less than(C) Equal to(D) Either more or less; depends on the type of fuel

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The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always (A) 1 (B) < 1 (C) > 1 (D) Unpredictable

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The maximum adiabatic flame temperature in air as compared to that in pure oxygen is (A) Much lower (B) Much higher (C) Same (D) Either lower or higher, depends on the type of fuel

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In general, the limit of inflammability/explosion limit of fuel gases is widened by the (A) Increase in gas pressure (B) Increase in temperature (i.e. preheating) (C) Use of pure oxygen for combustion instead of air (D) All (A), (B) & (C)

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Last Answer : (D) All (A), (B) & (C)

Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2 , 20%CO and 10%O2 . The percent excess oxygen used is (A) 20 (B) 12.5 (C) 0 (D) 10

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Last Answer : (C) 0

A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be (A) More (B) Less (C) Same (D) Data insufficient; can't be predicted

Description : A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be (A) More (B) Less (C) Same (D) Data insufficient; can't be predicted

Last Answer : (C) Same

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen. (A) Lower than (B) Higher than(C) Same as(D) Not related to

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Last Answer : (A) Lower than

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion (B) Nitrogen percentage in the fuel is very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel

Description : Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion ... very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel

Last Answer : (C) Excess air has been used for combustion

A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data supports [AIIMS 1992] (A) Law of constant composition (B) Law of conservation of mass (C) Law of reciprocal proportions (D) Law of multiple proportions

Description : A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data supports [AIIMS 1992] (A) Law of constant composition (B) Law of conservation of mass (C) Law of reciprocal proportions (D) Law of multiple proportions

Last Answer : (A) Law of constant composition

What happens when a pure substance undergoes a chemical changes?

Description : What happens when a pure substance undergoes a chemical changes?

Last Answer : when a pure substance undergoes a chemical change it is nolonger that same substance. A chemical change changes the identityof the substance. Hope i helped

What happens when a pure substance undergoes a chemical changes?

Description : What happens when a pure substance undergoes a chemical changes?

Last Answer : when a pure substance undergoes a chemical change it is nolonger that same substance. A chemical change changes the identityof the substance. Hope i helped

Does fire have an alternative to oxygen?

Description : Does fire have an alternative to oxygen?

Last Answer : Nope. But it doesn’t take a lot of oxygen, which is why roots can smolder for months.

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Description : Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Last Answer : (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns Explanation: Water is not effective on petrol fire because it has higher density than ... while petrol stays afloat and keeps burning. Petrochemical fires are nearly always extinguished with chemical foam.

Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by water (3) The heat required for combustion of petrol is very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Description : Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Last Answer : (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns Explanation: Water is not effective on petrol fire because it has higher density than petrol as a ... extinguished with chemical foam which forms a blanket over the flames and cuts off the oxygen supply.

Presence of soluble organics in polluted water causes (A) Undesirable plants growth (B) Depletion of oxygen (C) Fire hazards (D) Explosion hazards

Description : Presence of soluble organics in polluted water causes (A) Undesirable plants growth (B) Depletion of oxygen (C) Fire hazards (D) Explosion hazards

Last Answer : (B) Depletion of oxygen

Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes (A) Fire hazards (B) Explosion hazards (C) Persistent foam (D) Depletion of dissolved oxygen

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Last Answer : (C) Persistent foam

The material which on heating in presence of oxygen catches fire easily and produces heat and light energy is known as _________ material. a) combustible b)non-combustible c)conducting d)none

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Last Answer : a) combustible

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Description : Why is water not suitable for putting out a petrol fire ? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns 

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