Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?

Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.

A

50-80

B

250-400

C

1000-1200

D

800-900

The most stable allotropic form of phosphorous is the __________ phosphorous.

A

White

B

Black

C

Yellow

D

Red

Red phosphorous is changed into white phosphorous by

A

Heating in presence of light

B

Melting under pressure

C

Vaporisation followed by condensation

D

None of these

Both white phosphorous as well as red phosphorous

A

Are soluble in CS₂

B

Burns when heated in air

C

Reacts with hot caustic soda solution to give phosphine

D

All of the above

Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes

A

Foaming

B

Odour nuisances

C

Undesirable plant growth

D

Turbidity

Higher concentration of nitrogen dioxide in atmosphere air causes

A

Cancer

B

Bronchitis

C

Asphyxiation

D

Corrosion

Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?

A

Exact concentration of solution is not given

B

Character of semi permeable membrane is not given

C

The flow of solution is not possible through semi permeable membrane

D

All are incorrect

High amount of sulphur and phosphorous in coke causes

A

Decrease in its calorific value

B

Increase in its strength

C

Brittleness of steel made by using it

D

None of these

The molecular formula of phosphorous is

A

P₁

B

P₂

C

P₃

D

P₄

Most of the phosphorous present in the blast furnace burden enters into

A

Hot metal

B

Flue gases

C

Slag

D

Refractory lining

Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?

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