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

1. 1. ZnSO₄ .7H₂O

   
   
   

   2. Na₂SO₄ .7H₂O

   
   
   

   3. CaC₂O₄ .2H₂O

   
   
   

   4. MgSO₄ .7H₂O

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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152. Anhydrous zine chloride is prepared by heating

1. 1. ZnCl_2. 2H₂O

   
   
   

   2. Zn+HgCl₂

   
   
   

   3. Zn+Cl₂

   
   
   

   4. Both (b) and (c)

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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153. The electronic configuration of Cu²⁺ is

1. 1. [Ar]3d⁹

   
   
   

   2. [Ar]3d⁶ 4s² 4p¹

   
   
   

   3. [Ar]3d⁸ 4s¹

   
   
   

   4. [Ar]3d⁷ 4s²

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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154. Which of the following is most malleable ?

1. 1. Cu

   
   
   

   2. Ag

   
   
   

   3. Au

   
   
   

   4. none is malleable

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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155. Chalcopyrite is an ore of

1. 1. calcium

   
   
   

   2. copper

   
   
   

   3. magnesium

   
   
   

   4. gallium

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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