146. Which of the following compounds of zine is white when cold and yellow when hot ?

1. 1. ZnS

   
   
   

   2. ZnCl₂

   
   
   

   3. ZnSO₄

   
   
   

   4. ZnO

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

147. Dead burnt is

1. 1. Anhydrous Na₂SO₄

   
   
   

   2. Na₂CO₃Which is useful for softening

   
   
   

   3. CaSO₄ Which is not useful for setting

   
   
   

   4. Anhydrous CuSO₄

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

---

148. Consider the following statements :
     Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to
     1. act as the reducing agent
     2. remove silica associated with the iron ore
     3. function as fuel, to supply heat
     4. act as an oxidizing agent
     Of these statements

1. 1. 1 and 2 are correct

   
   
   

   2. 2 and 4 correct

   
   
   

   3. 1 and 3 are correct

   
   
   

   4. 3 and 4 are correct

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

149. Anhydrous zine chloride is prepared by heating

1. 1. ZnCl_2. 2H₂O

   
   
   

   2. Zn+HgCl₂

   
   
   

   3. Zn+Cl₂

   
   
   

   4. Both (b) and (c)

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

---

150. Which of the following compounds is known as white vitriol ?

1. 1. ZnSO₄ .7H₂O

   
   
   

   2. Na₂SO₄ .7H₂O

   
   
   

   3. CaC₂O₄ .2H₂O

   
   
   

   4. MgSO₄ .7H₂O

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---