16. Which of the following is a true statements regarding calcination

1. 1. The ore is heated strongly in the absence of any blast of air

   
   
   

   2. The ore is heated with calcium

   
   
   

   3. The ore is heated with carbon

   
   
   

   4. The mineral is melted with lime stone

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

17. Which of the following is used in atomic reactors ?

1. 1. Fe

   
   
   

   2. Cd

   
   
   

   3. Ru

   
   
   

   4. Al

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

18. Which of the following compounds is used as a yellow pigment in making oil and water colours ?

1. 1. Cd₂O

   
   
   

   2. CdS

   
   
   

   3. Cd(OH)₂

   
   
   

   4. CdO

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

19. Which of the following gases is evolved when curpric sulphide (CuS) is dissolved in dilute hydrochloric acid (HCI)

1. 1. S

   
   
   

   2. Cl₂

   
   
   

   3. H₂S

   
   
   

   4. H₂

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

20. The main constituents of bronze are

1. 1. Cu and Sn

   
   
   

   2. Cu and Ni

   
   
   

   3. Cu and Zn

   
   
   

   4. Zn and Sn

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---