Phosphorus

Q.

Match the following columns

Column 1	Column 2
Nitroso ferrous sulfate	Reddish brown
Nitric oxide	Brown black
Conc. nitric acid comes in contact with skin.	Brown
$N{O}_2$gas passed through acidified freshly prepared ferrous sulfate.	Yellow

Q. Phosphorus is estimated by Carius method as magnesium pyrophosphate.

1. True
2. False

Q. In the preparation of red phosphorus from white phosphorus :

1. $Mn{O}_2$ is used as a catalyst.
2. the white phosphorus is treated in an electric furance.
3. a little iodine is used as catalyst.
4. the gas $P_4$ is realeased.

Q. In the test for the detection of phosphorous present in an organic compound, which of the following compound is yellow colour or precipitate?

1. Ammonium phosphomolybdate
2. Sodium phosphate
3. phosphoric acid
4. ammonium phosphate

Q. The reagent used to detect phosphorous in an organic compound is :

1. $AgN{O}_3$
2. $FeS{O}_4$
3. $(N{H}_4{)}_{2}Mo{O}_4$
4. $BaC{l}_2$

Q. For the detection of phosphorus , the organic compound after fusion with $N{a}_2{O}_2$ is extracted with water, boiled with $HN{O}_3$ and then ammonium molybdate added to it. A yellow ppt. is obtained which is due to formation of :

1. ammonium sulphate
2. ammonium phosphomolybdate
3. ferric phosphate
4. disodium ammonium phosphate

Q. Red phosphorus , $\beta -$phosphorus and $\alpha -$phosphorus are allotropes of phosphorus which can be prepared from white phosphorous.

1. True
2. False

Q. The acid used in the detection of phosphorus in an organic compound is:

1. $H_{2}S{O}_4$
2. $HN{O}_3$
3. $HCl$
4. any of the above

Q. In organic compounds, phosphorus is estimated as :

1. $M{g}_2{P}_2{O}_7$
2. $Mg\left(N{H}_4\right)P{O}_4$
3. $M{g}_3(P{O}_4{)}_2$
4. $H_{3}P{O}_4$

Q. Phoshphorus content in an organic compound can be detected by:

1. sesquioxide
2. superoxide
3. peroxide
4. suboxide

Q. The colour of ammonium phosphomolybdate is:

1. green
2. colourless
3. bhue
4. yellow

Q. The sodium extract of an organic compound on boiling with $HN{O}_3$ and on subsequent treatment with ammonium molybdate solution gives a yellow precipitate. Which of the following elements may be present in the compound?

1. Nitrogen
2. Sulphur
3. Phosphorus
4. Halogen

Q. Fill in the blanks:
The sodium extract of an organic compound on boiling with $HN{O}_3$ and treatment with ammonium molybdate solution gives a yellow precipitate. It indicates the precipitate of ___________ in the compound.

Q. What is the name of the industrial process to manufacture nitric acid?