56. The element that has the highest first ionization potential is

1. 1. Boron

   
   
   

   2. Nitrogen

   
   
   

   3. Oxygen

   
   
   

   4. Carbon

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

57. Helogens belong to the

1. 1. s-block

   
   
   

   2. p-block

   
   
   

   3. d-block

   
   
   

   4. f-block

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

58. An example of a non-stoichiometric compound is

1. 1. PbO

   
   
   

   2. NiO₂

   
   
   

   3. AI₂O₃

   
   
   

   4. Fe₃O₄

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

59. In modern periodic table, the group number is

1. 1. 15

   
   
   

   2. 16

   
   
   

   3. 17

   
   
   

   4. 18

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

---

60. In modern periodic table, the number of period is

1. 1. 2

   
   
   

   2. 6

   
   
   

   3. 7

   
   
   

   4. 8

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---