216. 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

   
   
   

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   NA

   Correct Option: C

   NA

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217. Which is soluble in water ?

1. 1. AgF

   
   
   

   2. AgCI

   
   
   

   3. AgBr

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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218. The electrolysis of potassium maganate solution gives

1. 1. KMnO₄ +KOH.

   
   
   

   2. KOH+H₂

   
   
   

   3. KOH+O₂

   
   
   

   4. MnO₂ +KOH

   
   
   

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   NA

   Correct Option: A

   NA

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219. During the process of electrolytic refining of copper, some metals present as impurity settle as anode mud. These are

1. 1. Pb and Zn

   
   
   

   2. Ag and Au

   
   
   

   3. Sn and Ag

   
   
   

   4. Fe and Ni

   
   
   

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   NA

   Correct Option: B

   NA

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220. The alkali metal which is a liquid at room temperature is

1. 1. Cs

   
   
   

   2. Rb

   
   
   

   3. Na

   
   
   

   4. Fr

   
   
   

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   NA

   Correct Option: D

   NA

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