176. The colour of iodine solution is discharged by shaking it with aqueous solution of

1. 1. sodium sulphate

   
   
   

   2. sodium sulphite

   
   
   

   3. sodium thiosulphate

   
   
   

   4. sulphuric acid

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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177. Which one of the following does not participate in Solvey's process for the manufacture of Ma₂CO₃ ?

1. 1. CO₂

   
   
   

   2. NH₃

   
   
   

   3. H₂SO₄

   
   
   

   4. NaCl

   
   
   

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   NA

   Correct Option: C

   NA

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178. Which of the following potassium compounds is known as 'Pearl ash' ?

1. 1. K₂SO₄

   
   
   

   2. K₂CO₃

   
   
   

   3. KMnO₄

   
   
   

   4. KOH

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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179. Which of the following is a carbonate ore ?

1. 1. cassiterite

   
   
   

   2. pyrolysite

   
   
   

   3. diaspore

   
   
   

   4. malachite

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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180. The aqueous solution containing which one of the following ions will be colourless ?

1. 1. SC³⁺

   
   
   

   2. Fe³⁺

   
   
   

   3. Fe²⁺

   
   
   

   4. Mn²⁺

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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