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2644. Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

Decolourisation of sugar

Solvent recovery from air and gases

Absorption of gases and vapor

Electrode manufacture

✅ The correct answer is option D.

2571. Products drawn from the top to bottom of the crude oil distillation column has progressively increasing

boiling points

molecular weight

C/H ratio

all (a), (b) and (c)

✅ The correct answer is option D.

2576. The hottest part of the flame lies in its____zone.

Non-luminous

Luminous

Yellow

Unburnt gases

✅ The correct answer is option A.

2581. Which of the following has the highest viscosity of all (at a given temperature) ?

Naphtha

Fuel oil

Light diesel oil

Petrol

✅ The correct answer is option B.

2586. Spontaneous combustion of coal on storage results due to

Inadequate ventilation

Low temperature oxidation

Storage in large heaps with small surface to volume ratio

All of the above

✅ The correct answer is option D.

2591. A good lubricant should have high

viscosity index

volatility

pour point

none of these

✅ The correct answer is option A.

2596. Bright coal

Contains more than 90% durain

Contains more than 90% fussain

Contains mainly vitrain & clarain and is generally coking

Is non-coking

✅ The correct answer is option C.

2601. In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

Gas yield is less

Tar yield is more

Ignition temperature of coke produced is less

Aromatic content of tar produced is more

✅ The correct answer is option D.

2605. Naphthenic acid is represented by

CnH2n+2O2

CnH2n-2O2

CnH2n+2O2 (n ≥ 6)

CnH2n+6O2 (n ≤ 6)

✅ The correct answer is option B.

2610. Which of the following accounts for maximum energy loss in a boiler?

Flue gases

Ash content in the fuel

Incomplete combustion

Unburnt carbon in flue gases

✅ The correct answer is option A.