271. Pure nitrogen is obtained from

1. 1. NH₃ + NaNO₂

   
   
   

   2. NH₄CI + NaNO₂

   
   
   

   3. N₂O + Cu

   
   
   

   4. (NH₄)₂ Cr₂O₇

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

272. Which is not a fertilizer ?

1. 1. Urea

   
   
   

   2. Super phosphate

   
   
   

   3. Sodium sulphate

   
   
   

   4. Potassium nitrate

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

273. The formula of white phosphorus is

1. 1. P₄

   
   
   

   2. P₃

   
   
   

   3. P₂

   
   
   

   4. P

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

274. The basicity of ortho phosphoric acid is

1. 1. 2

   
   
   

   2. 3

   
   
   

   3. 4

   
   
   

   4. 5

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

275. H₃PO₃ is

1. 1. A tribasic

   
   
   

   2. A dibasic

   
   
   

   3. A monobasic

   
   
   

   4. Neutral

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---