16. An alloy is

1. 1. a compound

   
   
   

   2. an allotropic form

   
   
   

   3. an isomer

   
   
   

   4. a mixture

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

17. 1 amu is equal to

1. 1. 1.00758 g

   
   
   

   2. 0.000549 g

   
   
   

   3. 1.66 x 10^-24 g

   
   
   

   4. 6.02 x 10^-23 g

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

18. The best standard of atomic mass is

1. 1. carbon - 12

   
   
   

   2. oxygen - 16

   
   
   

   3. hydrogen - 1.008

   
   
   

   4. chlorine - 35.5

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

19. The credit for the discovery of transoceanic element goes to

1. 1. Hahn

   
   
   

   2. Rutherford

   
   
   

   3. Seaborg

   
   
   

   4. Curie

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

20. A pure substance can only be

1. 1. compound

   
   
   

   2. an element

   
   
   

   3. an element or a compound

   
   
   

   4. a heterogeneous mixture

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---