296. The compound in which oxygen shows -1 oxidation state is ?

1. 1. Na₂O

   
   
   

   2. Na₂O₂

   
   
   

   3. CaO

   
   
   

   4. MgO

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

297. Which of the following is formed when white phosphorus is heated at 540 K in the absence of air ?

1. 1. α-phosphorus

   
   
   

   2. Black phosphorus

   
   
   

   3. Red phosphorus

   
   
   

   4. Elementary phosphorus

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

298. P₄O₁₀ is an anhydride of

1. 1. H₂P₂O₇

   
   
   

   2. H₃PO₄

   
   
   

   3. HPO₃

   
   
   

   4. H₃PO₃

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

299. The acidic character of dioxides of members of oxygen family decreases in the order

1. 1. PoO₂ > TeO₂ > SeO₂ > SO₂

   
   
   

   2. TeO₂ > PoO₂ > SeO₂ > SO₂

   
   
   

   3. SO₂ > SeO₂ > TeO₂ > PoO₂

   
   
   

   4. SeO₂ > SO₂ > TeO₂ > PoO₂

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

300. The structure of ozoneis

1. 1. Pyramidal

   
   
   

   2. Tetrahedral

   
   
   

   3. Octahedral

   
   
   

   4. Angular

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---